学习笔记-Spring（二）

Spring框架的全部教程，详细点这里
使用注解的方式完成注入对象中的效果

修改applicationContext.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-3.0.xsd
   http://www.springframework.org/schema/aop 
   http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
   http://www.springframework.org/schema/tx 
   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
   http://www.springframework.org/schema/context      
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:annotation-config /><!-- 告诉Spring要用注解的方式配置 -->
    <bean name="s" class="com.bean.Student">
        <property name="name" value="Student" />
    </bean>
    <bean name="t" class="com.bean.Teacher">
        <property name="name" value="Teacher" />
        <!-- <property name="student" ref="s" />注释掉这句 -->
    </bean><!-- 以上:注入对象行为注解 -->

</beans>

2.在Teacher.java的Student属性前加上@Autowired注解

package com.bean;
public class Teacher {
    private int id;
    private String name;
    // 添加Autowired注解，也可以在setStudent()位置加注解，效果一样
     @Autowired
    private Student student;
}

3.运行测试

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        // System.out.println("test page !!!");

        ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
        // 通过Spring拿到的Student对象的name属性
        // Student s1 = (Student) context.getBean("s");
        // System.out.println(s1.getName());

        Teacher t = (Teacher) context.getBean("t");
        t.setName("teacher--1");
        t.setStudent(new Student("student--1"));
        System.out.println(t.getName());
        System.out.println(t.getStudent().getName());

    }

}

对Bean的注解

1、修改applicationContext.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-3.0.xsd
   http://www.springframework.org/schema/aop 
   http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
   http://www.springframework.org/schema/tx 
   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
   http://www.springframework.org/schema/context      
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="com.bean"/>
    <!-- 告诉Spring，bean都放在com.bean这个包下-->
</beans>

2、为Student、Teacher类加上@Component注解，即表明此类是bean

@Component("s")
public class Student

@Component("t")
public class Teacher

3、运行测试通上

学习笔记-Spring（二）

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