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Java Spring笔记01 Set注入

meowrain 收录于 Java - Spring
 约 3300 字 预计阅读 16 分钟 
注意
本文最后更新于 2024-05-23，文中内容可能已过时。

maven配置 

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>spring_first</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <releases>
                <enabled>false</enabled>
            </releases>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>6.1.0-SNAPSHOT</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.10.1</version>
            <scope>test</scope>
        </dependency>
        <!--log4j2的依赖-->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.19.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j2-impl</artifactId>
            <version>2.19.0</version>
        </dependency>
    </dependencies>
</project>

set注入

注入外部Bean 

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="userDaoBean" class="com.powernode.spring6.dao.UserDao"/>

    <bean id="userServiceBean" class="com.powernode.spring6.service.UserService">
        <property name="userDao" ref="userDaoBean"/>
    </bean>

</beans>

注入内部Bean 

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="userServiceBean" class="com.powernode.spring6.service.UserService">
        <property name="userDao">
            <bean class="com.powernode.spring6.dao.UserDao"/>
        </property>
    </bean>

</beans>

不使用ref,直接在里面嵌套一个bean

注入简单类型 

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UserDaoService.java

        package com.powercode.spring6.service;

import com.powercode.spring6.dao.UserDao;

public class UserService {
    private UserDao userDao;
    private String userName;
    public int age;

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public void setAge(int age) {
        this.age = age;
    }
    /*必须提供一个set方法进行set注入*/

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public void saveUser() {
        //保存用户信息到数据库
        userDao.insert();

    }

    @Override
    public String toString() {
        return "UserService{" +
                "userDao=" + userDao +
                ", userName='" + userName + '\'' +
                ", age=" + age +
                '}';
    }
}

对应的xml

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<bean id="userServiceBean" class="com.powercode.spring6.service.UserService">
    <property name="userDao" ref="userDaoBean"></property>
    <property name="userName">
        <value>meowrain</value>
    </property>
    <property name="age">
        <value>20</value>
    </property>
</bean>

我们测试以下

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package com.powercode.spring6.test;

import com.powercode.spring6.service.UserService;
import org.junit.jupiter.api.Test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class FirstSpringTest {
    @Test
    public void testFirstSpringCode() {
        //第一步：获取spring容器对象
        // ApplicationContext 翻译为：应用上下文，也就是Spring容器
        // ApplicationContext是一个接口
        // ApplicationContext 接口下有很多实现类
        // 其中有一个实现类叫做：ClassPathXmlApplicationContext
        // 这个实现类是专门从类路径中加载spring配置文件的
        //  ApplicationContext applicationContext = new ClassPathXmlApplicationContext(类路径);
        Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");

        // 第二步：根据bean的id从Spring容器中获取这个对象
        UserService userService = applicationContext.getBean("userServiceBean", UserService.class);
        logger.info(userService.toString());

    }
}

image

需要特别注意：如果给简单类型赋值，使用value属性或value标签。而不是ref。

image

级联属性赋值

要点： ● 在spring配置文件中，如上，注意顺序。 ● 在spring配置文件中，clazz属性必须提供getter方法。

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Student.java
package com.powercode.spring6.beans;

public class Student {
    private String name;
    private int age;
    private Clazz clazz;

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setClazz(Clazz clazz) {
        this.clazz = clazz;
    }

    public Clazz getClazz() {
        return clazz;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", clazz=" + clazz +
                '}';
    }
}
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Clazz.java
package com.powercode.spring6.beans;

public class Clazz {
    private String name;

    public void setName(String name) {
        this.name = name;
    }
}
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spring.xml
        <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="student" class="com.powercode.spring6.beans.Student">
        <property name="age" value="20"></property>
        <property name="name" value="meowrain"></property>
        <property name="clazz" ref="clazz"></property>
        <!--级联属性赋值-->
        <property name="clazz.name" value="246"></property>
    </bean>

    <bean id="clazz" class="com.powercode.spring6.beans.Clazz"></bean>
</beans>
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测试函数
@Test

public void testSecondSpringCode() {
    Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring2.xml");
    Student student = applicationContext.getBean("student", Student.class);
    logger.info(student.toString());
}

image

注入数组 

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Student.java
```java
package com.powercode.spring6.beans;

public class Student {
    private String name;
    private int age;
    private Clazz clazz;
    private String[] hobbies;

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setClazz(Clazz clazz) {
        this.clazz = clazz;
    }

    public void setHobbies(String[] hobbies) {
        this.hobbies = hobbies;
    }

    public Clazz getClazz() {
        return clazz;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", clazz=" + clazz +
                ", hobbies=" + Arrays.toString(hobbies) +
                '}';
    }
}
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spring2.xml
        <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="student" class="com.powercode.spring6.beans.Student">
        <property name="age" value="20"></property>
        <property name="name" value="meowrain"></property>
        <property name="clazz" ref="clazz"></property>
        <!--级联属性赋值-->
        <property name="clazz.name" value="246"></property>

        <!--数组属性赋值-->
        <property name="hobbies">
            <array>
                <value>play games</value>
                <value>programming</value>
                <value>learn use computer</value>
                <value>play football</value>
                <value>eat apples</value>
            </array>
        </property>
    </bean>

    <bean id="clazz" class="com.powercode.spring6.beans.Clazz"></bean>
</beans>
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测试函数
@Test

public void testSecondSpringCode() {
    Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring2.xml");
    Student student = applicationContext.getBean("student", Student.class);
    logger.info(student.toString());
}
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/usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=36671:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testSecondSpringCode
2024-01-09 11:22:37 694 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@75ed9710
2024-01-09 11:22:37 791 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 2 bean definitions from class path resource [spring2.xml]
2024-01-09 11:22:37 806 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'student'
2024-01-09 11:22:37 827 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'clazz'
2024-01-09 11:22:37 840 [main] INFO com.powercode.spring6.test.FirstSpringTest - Student{name='meowrain', age=20, clazz=com.powercode.spring6.beans.Clazz@3d9fc57a, hobbies=[play games, programming, learn use computer, play football, eat apples]}

进程已结束，退出代码为 0

当数组中的内容不是简单类型的时候，只需要把里面的<value>替换为<ref>

要点： ● 如果数组中是简单类型，使用value标签。 ● 如果数组中是非简单类型，使用ref标签。

注入list集合 

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package com.powercode.spring6.beans;

import java.util.Arrays;
import java.util.List;

public class Student {
    private String name;
    private int age;
    private Clazz clazz;
    private List hobbies;

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setClazz(Clazz clazz) {
        this.clazz = clazz;
    }

    public void setHobbies(List hobbies) {
        this.hobbies = hobbies;
    }

    public Clazz getClazz() {
        return clazz;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", clazz=" + clazz +
                ", hobbies=" + hobbies +
                '}';
    }
}
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="student" class="com.powercode.spring6.beans.Student">
        <property name="age" value="20"></property>
        <property name="name" value="meowrain"></property>
        <property name="clazz" ref="clazz"></property>
        <!--级联属性赋值-->
        <property name="clazz.name" value="246"></property>

        <!--数组属性赋值-->
        <property name="hobbies">
            <list>
                <value>play games</value>
                <value>programming</value>
                <value>learn use computer</value>
                <value>play football</value>
                <value>eat apples</value>
            </list>
        </property>
    </bean>

    <bean id="clazz" class="com.powercode.spring6.beans.Clazz"></bean>
</beans>
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2024-01-09 11:49:17 697 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@75ed9710
2024-01-09 11:49:17 798 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 2 bean definitions from class path resource [spring2.xml]
2024-01-09 11:49:17 814 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'student'
2024-01-09 11:49:17 837 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'clazz'
2024-01-09 11:49:17 850 [main] INFO com.powercode.spring6.test.FirstSpringTest - Student{name='meowrain', age=20, clazz=com.powercode.spring6.beans.Clazz@1ad777f, hobbies=[play games, programming, learn use computer, play football, eat apples]}

进程已结束，退出代码为 0

注意：注入List集合的时候使用list标签，如果List集合中是简单类型使用value标签，反之使用ref标签。

注入set集合

不多说，和上面差不多 要点： ● 使用标签 ● set集合中元素是简单类型的使用value标签，反之使用ref标签。

注入Properties

java.util.Properties继承java.util.Hashtable，所以Properties也是一个Map集合。

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  Student.java
        package com.powercode.spring6.beans;

import java.util.Arrays;
import java.util.List;
import java.util.Properties;

public class Student {
    private String name;
    private int age;
    private Clazz clazz;
    private List hobbies;
    private Properties properties;

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setClazz(Clazz clazz) {
        this.clazz = clazz;
    }

    public void setHobbies(List hobbies) {
        this.hobbies = hobbies;
    }

    public Clazz getClazz() {
        return clazz;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", clazz=" + clazz +
                ", hobbies=" + hobbies +
                ", properties=" + properties +
                '}';
    }
}
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  测试函数
@Test

public void testSecondSpringCode() {
    Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring2.xml");
    Student student = applicationContext.getBean("student", Student.class);
    logger.info(student.toString());
}
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  /usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=44101:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testSecondSpringCode
2024-01-09 12:13:56 046 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@75ed9710
2024-01-09 12:13:56 158 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 2 bean definitions from class path resource [spring2.xml]
2024-01-09 12:13:56 174 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'student'
2024-01-09 12:13:56 197 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'clazz'
2024-01-09 12:13:56 212 [main] INFO com.powercode.spring6.test.FirstSpringTest - Student{name='meowrain', age=20, clazz=com.powercode.spring6.beans.Clazz@4a67318f, hobbies=[play games, programming, learn use computer, play football, eat apples], properties={password=123456, driver=com.mysql.cj.jdbc.Driver, url=jdbc:mysql://localhost:3306/spring, username=root}}

进程已结束，退出代码为 0

要点： ● 使用标签嵌套标签完成。

注入null和空字符串

注入空字符串使用：<value/> 或者 value="" 注入null使用：<null/> 或者 不为该属性赋值

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Student.java
        package com.powercode.spring6.beans;

import java.util.Arrays;
import java.util.List;
import java.util.Properties;

public class Student {
    private String name;
    private int age;
    private Clazz clazz;
    private List hobbies;
    private Properties properties;

    private String email;

    public void setEmail(String email) {
        this.email = email;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setClazz(Clazz clazz) {
        this.clazz = clazz;
    }

    public void setHobbies(List hobbies) {
        this.hobbies = hobbies;
    }

    public Clazz getClazz() {
        return clazz;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", clazz=" + clazz +
                ", hobbies=" + hobbies +
                ", properties=" + properties +
                ", email='" + email + '\'' +
                '}';
    }
}
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  spring2.xml
        <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--
    bean标签的两个重要属性
    id: 是这个bean的身份证号，不能重复，是唯一的标识
    class: 必须填写类的全路径，带包名的类名
    -->

    <!-- 配置其他的bean-->
    <bean id="userDaoBean" class="com.powercode.spring6.dao.UserDao"></bean>

    <!--配置iservice-->

    <bean id="userServiceBean" class="com.powercode.spring6.service.UserService">
        <property name="userDao" ref="userDaoBean"></property>
        <property name="userName">
            <value>meowrain</value>
        </property>
        <property name="age">
            <value>20</value>
        </property>
    </bean>

    <bean id="orderDaoBean" class="com.powercode.spring6.dao.OrderDao"></bean>
    <bean id="orderDaoService" class="com.powercode.spring6.service.OrderDaoService">
        <constructor-arg index="0" ref="orderDaoBean"></constructor-arg>
        <constructor-arg index="1" ref="userDaoBean"></constructor-arg>
    </bean>
</beans>
        ---

        ```java
        测试程序
        @Test
        public void testSecondSpringCode() {
        Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring2.xml");
        Student student = applicationContext.getBean("student", Student.class);
        logger.info(student.toString());
        }
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  /usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=37501:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testSecondSpringCode
2024-01-09 12:20:28 206 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@75ed9710
2024-01-09 12:20:28 308 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 2 bean definitions from class path resource [spring2.xml]
2024-01-09 12:20:28 323 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'student'
2024-01-09 12:20:28 349 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'clazz'
2024-01-09 12:20:28 359 [main] INFO com.powercode.spring6.test.FirstSpringTest - Student{name='meowrain', age=20, clazz=null, hobbies=[play games, programming, learn use computer, play football, eat apples], properties={password=123456, driver=com.mysql.cj.jdbc.Driver, url=jdbc:mysql://localhost:3306/spring, username=root}, email=''}

进程已结束，退出代码为 0

注入的值中含有特殊符号

XML中有5个特殊字符，分别是：<、>、'、"、& 以上5个特殊符号在XML中会被特殊对待，会被当做XML语法的一部分进行解析，如果这些特殊符号直接出现在注入的字符串当中，会报错。

解决方案包括两种： ● 第一种：特殊符号使用转义字符代替。 ● 第二种：将含有特殊符号的字符串放到： 当中。因为放在CDATA区中的数据不会被XML文件解析器解析。

特殊字符 转义字符
> &gt;
< &lt;
" &quot;
& &amp;
' &apos; 
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Student.java
        package com.powercode.spring6.beans;

import java.util.Arrays;
import java.util.List;
import java.util.Properties;

public class Student {
    private String name;
    private int age;
    private Clazz clazz;
    private List hobbies;
    private Properties properties;

    private String email;

    private String result;

    public void setEmail(String email) {
        this.email = email;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setClazz(Clazz clazz) {
        this.clazz = clazz;
    }

    public void setHobbies(List hobbies) {
        this.hobbies = hobbies;
    }

    public Clazz getClazz() {
        return clazz;
    }

    public void setResult(String result) {
        this.result = result;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", clazz=" + clazz +
                ", hobbies=" + hobbies +
                ", properties=" + properties +
                ", email='" + email + '\'' +
                ", result='" + result + '\'' +
                '}';
    }
}

image

image

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    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="student" class="com.powercode.spring6.beans.Student">
        <!--简单属性赋值-->
        <property name="age" value="20"></property>
        <property name="name" value="meowrain"></property>
        <property name="result" value="2 &lt; 3"/>
        <property name="email">
            <value/> <!--注入空字符串-->
        </property>
        <!--复合属性赋值-->
        <property name="clazz">
            <null/> <!--注入null-->
        </property>


        <!--数组属性赋值-->
        <property name="hobbies">
            <list>
                <value>play games</value>
                <value>programming</value>
                <value>learn use computer</value>
                <value>play football</value>
                <value>eat apples</value>
            </list>
        </property>
        <!--propertiess属性赋值-->
        <property name="properties">
            <props>
                <prop key="driver">com.mysql.cj.jdbc.Driver</prop>
                <prop key="url">jdbc:mysql://localhost:3306/spring</prop>
                <prop key="username">root</prop>
                <prop key="password">123456</prop>
            </props>
        </property>
    </bean>
    <bean id="clazz" class="com.powercode.spring6.beans.Clazz"></bean>
</beans>
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    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="student" class="com.powercode.spring6.beans.Student">
        <!--简单属性赋值-->
        <property name="age" value="20"></property>
        <property name="name" value="meowrain"></property>
        <property name="result">
            <value><![CDATA[2<3]]></value>
        </property>
        <property name="email">
            <value/> <!--注入空字符串-->
        </property>
        <!--复合属性赋值-->
        <property name="clazz">
            <null/> <!--注入null-->
        </property>


        <!--数组属性赋值-->
        <property name="hobbies">
            <list>
                <value>play games</value>
                <value>programming</value>
                <value>learn use computer</value>
                <value>play football</value>
                <value>eat apples</value>
            </list>
        </property>
        <!--propertiess属性赋值-->
        <property name="properties">
            <props>
                <prop key="driver">com.mysql.cj.jdbc.Driver</prop>
                <prop key="url">jdbc:mysql://localhost:3306/spring</prop>
                <prop key="username">root</prop>
                <prop key="password">123456</prop>
            </props>
        </property>
    </bean>

    <bean id="clazz" class="com.powercode.spring6.beans.Clazz"></bean>
</beans>
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/usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=43345:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testSecondSpringCode
2024-01-09 12:44:56 885 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@75ed9710
2024-01-09 12:44:56 993 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 2 bean definitions from class path resource [spring2.xml]
2024-01-09 12:44:57 010 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'student'
2024-01-09 12:44:57 037 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'clazz'
2024-01-09 12:44:57 049 [main] INFO com.powercode.spring6.test.FirstSpringTest - Student{name='meowrain', age=20, clazz=null, hobbies=[play games, programming, learn use computer, play football, eat apples], properties={password=123456, driver=com.mysql.cj.jdbc.Driver, url=jdbc:mysql://localhost:3306/spring, username=root}, email='', result='2<3'}

进程已结束，退出代码为 0

p命名空间注入

目的：简化配置。 使用p命名空间注入的前提条件包括两个：

● 第一：在XML头部信息中添加p命名空间的配置信息：xmlns:p=“http://www.springframework.org/schema/p"

● 第二：p命名空间注入是基于setter方法的，所以需要对应的属性提供setter方法。

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Customer.java
package com.powercode.spring6.beans;

public class Customer {
    private String name;
    private int age;
    public void setName(String name) {
        this.name = name;
    }
    public void setAge(int age){
        this.age = age;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}
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spring3.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="customerBean" class="com.powercode.spring6.beans.Customer" p:name="meowrain" p:age="20"></bean>
</beans>
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测试函数
@Test
public void testThirdSpringCode() {
    Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring3.xml");
    Customer customer = applicationContext.getBean("customerBean",Customer.class);
    logger.info(customer.toString());
}
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函数执行结果

/usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=39503:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testThirdSpringCode
2024-01-09 12:52:54 636 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4fc5e095
2024-01-09 12:52:54 735 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 1 bean definitions from class path resource [spring3.xml]
2024-01-09 12:52:54 757 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'customerBean'
2024-01-09 12:52:54 795 [main] INFO com.powercode.spring6.test.FirstSpringTest - Customer{name='meowrain', age=20}

进程已结束，退出代码为 0

所以p命名空间实际上是对set注入的简化。

c命名空间注入

c命名空间是简化构造方法注入的。

使用c命名空间的两个前提条件：

第一：需要在xml配置文件头部添加信息：xmlns:c="http://www.springframework.org/schema/c"

第二：需要提供构造方法。

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配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:c="http://www.springframework.org/schema/c"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="myTimeBean" class="com.powercode.spring6.beans.MyTime" c:day="9" c:month="1" c:year="2024">
</bean>
</beans>
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MyTime.java
package com.powercode.spring6.beans;

public class MyTime {
    private int year;
    private int month;
    private int day;

    public MyTime(int year,int month,int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    @Override
    public String toString() {
        return "MyTime{" +
                "year=" + year +
                ", month=" + month +
                ", day=" + day +
                '}';
    }
}
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测试函数
    @Test
    public void testForthSpringCode() {
        Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring4.xml");
        MyTime myTime = applicationContext.getBean("myTimeBean",MyTime.class);
        logger.info(myTime.toString());
    }
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/usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=41855:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testForthSpringCode
2024-01-09 13:07:18 711 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@435871cb
2024-01-09 13:07:18 813 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 1 bean definitions from class path resource [spring4.xml]
2024-01-09 13:07:18 829 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'myTimeBean'
2024-01-09 13:07:18 861 [main] INFO com.powercode.spring6.test.FirstSpringTest - MyTime{year=9, month=1, day=2024}

进程已结束，退出代码为 0

util命名空间

使用util命名空间可以让配置复用。

使用util命名空间的前提是：在spring配置文件头部添加配置信息。如下：

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配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
    ">

</beans>
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MyDataSource1.java
package com.powercode.spring6.beans;

import java.util.Properties;

public class MyDataSource1 {
    private Properties properties;

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    @Override
    public String toString() {
        return "MyDataSource1{" +
                "properties=" + properties +
                '}';
    }
}
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MyDataSource2.java
package com.powercode.spring6.beans;

import java.util.Properties;

public class MyDataSource2 {
    private Properties properties;

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    @Override
    public String toString() {
        return "MyDataSource2{" +
                "properties=" + properties +
                '}';
    }
}
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测试函数
    @Test
    public void testFifthSpringCode() {
        Logger logger = LoggerFactory.getLogger(FirstSpringTest.class);
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring5.xml");
        MyDataSource1 myDataSource1 = applicationContext.getBean("dataSource1",MyDataSource1.class);
        MyDataSource2 myDataSource2 = applicationContext.getBean("dataSource2",MyDataSource2.class);
        logger.info(myDataSource1.toString());
        logger.info(myDataSource2.toString());
    }
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运行结果

/usr/lib/jvm/java-17-openjdk/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar=45041:/opt/intellij-idea-ultimate-edition/bin -Dfile.encoding=UTF-8 -classpath /home/meowrain/.m2/repository/org/junit/platform/junit-platform-launcher/1.10.1/junit-platform-launcher-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-engine/1.10.1/junit-platform-engine-1.10.1.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar:/opt/intellij-idea-ultimate-edition/lib/idea_rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit5-rt.jar:/opt/intellij-idea-ultimate-edition/plugins/junit/lib/junit-rt.jar:/home/meowrain/IdeaProjects/spring_first/target/test-classes:/home/meowrain/IdeaProjects/spring_first/target/classes:/home/meowrain/.m2/repository/org/springframework/spring-context/6.1.0-SNAPSHOT/spring-context-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-aop/6.1.0-SNAPSHOT/spring-aop-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-beans/6.1.0-SNAPSHOT/spring-beans-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-core/6.1.0-SNAPSHOT/spring-core-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-jcl/6.1.0-SNAPSHOT/spring-jcl-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/org/springframework/spring-expression/6.1.0-SNAPSHOT/spring-expression-6.1.0-20231116.112758-846.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-observation/1.12.0/micrometer-observation-1.12.0.jar:/home/meowrain/.m2/repository/io/micrometer/micrometer-commons/1.12.0/micrometer-commons-1.12.0.jar:/home/meowrain/.m2/repository/org/junit/jupiter/junit-jupiter-api/5.10.1/junit-jupiter-api-5.10.1.jar:/home/meowrain/.m2/repository/org/opentest4j/opentest4j/1.3.0/opentest4j-1.3.0.jar:/home/meowrain/.m2/repository/org/junit/platform/junit-platform-commons/1.10.1/junit-platform-commons-1.10.1.jar:/home/meowrain/.m2/repository/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-core/2.19.0/log4j-core-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-api/2.19.0/log4j-api-2.19.0.jar:/home/meowrain/.m2/repository/org/apache/logging/log4j/log4j-slf4j2-impl/2.19.0/log4j-slf4j2-impl-2.19.0.jar:/home/meowrain/.m2/repository/org/slf4j/slf4j-api/2.0.0/slf4j-api-2.0.0.jar com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.powercode.spring6.test.FirstSpringTest,testFifthSpringCode
2024-01-09 13:28:08 216 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@609640d5
2024-01-09 13:28:08 330 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 3 bean definitions from class path resource [spring5.xml]
2024-01-09 13:28:08 350 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'prop'
2024-01-09 13:28:08 375 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'dataSource1'
2024-01-09 13:28:08 377 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'dataSource2'
2024-01-09 13:28:08 384 [main] INFO com.powercode.spring6.test.FirstSpringTest - MyDataSource1{properties={password=123456, driver=com.mysql.cj.jdbc.Driver, url=jdbc:mysql://localhost:3306/spring, username=root}}
2024-01-09 13:28:08 384 [main] INFO com.powercode.spring6.test.FirstSpringTest - MyDataSource2{properties={password=123456, driver=com.mysql.cj.jdbc.Driver, url=jdbc:mysql://localhost:3306/spring, username=root}}

进程已结束，退出代码为 0

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更新于 2024-05-23 
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