spring 注入的方式（注解搭配xml）

使用注解的方式把类注入到容器

1.新建pojo 实体类，Student ,ClassRoom ,Adress,并加上注解

//student类
package pojo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

public class Student {
    private int id;
    private String name;
    @Autowired
    private Adress adress;
//    当有多个ClassRoom 类的时候，设定用id为classRoom2的bean
    @Autowired
    @Qualifier("classRoom2")
    private ClassRoom classRoom;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public Adress getAdress() {
        return adress;
    }

    public void setAdress(Adress adress) {
        this.adress = adress;
    }

    public ClassRoom getClassRoom() {
        return classRoom;
    }

    public void setClassRoom(ClassRoom classRoom) {
        this.classRoom = classRoom;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", adress=" + adress +
                ", classRoom=" + classRoom +
                '}';
    }
}

//ClassRoom类
package pojo;
public class ClassRoom {
    private Integer id;
    private String roomName;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getRoomName() {
        return roomName;
    }

    public void setRoomName(String roomName) {
        this.roomName = roomName;
    }

    @Override
    public String toString() {
        return "ClassRoom{" +
                "id=" + id +
                ", roomName='" + roomName + '\'' +
                '}';
    }
}


//Adress类
package pojo;
public class Adress {
    private Integer id;
    private String aressMessage;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getAressMessage() {
        return aressMessage;
    }

    public void setAressMessage(String aressMessage) {
        this.aressMessage = aressMessage;
    }

    @Override
    public String toString() {
        return "Adress{" +
                "id=" + id +
                ", aressMessage='" + aressMessage + '\'' +
                '}';
    }
}

2.配置xml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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="adress" class="pojo.Adress" >
        <property name="aressMessage" value="shanwei"></property>
    </bean>

    <bean id="classRoom1" class="pojo.ClassRoom">
        <property name="roomName" value="一班"></property>
    </bean>

    <bean id="classRoom2" class="pojo.ClassRoom">
        <property name="roomName" value="二班"></property>
    </bean>

    <bean id="student" class="pojo.Student"></bean>

<!--    开启注解-->
    <context:annotation-config/>

</beans>

3.编写测试类

package test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import pojo.Student;

public class Mytest {
    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        Student student=applicationContext.getBean("student", Student.class);
        System.out.println(student);
    }
}
输出的结果是：
Student{id=0, name='null', adress=Adress{id=null, aressMessage='shanwei'}, classRoom=ClassRoom{id=null, roomName='二班'}}