【笔记】Spring4框架系列 [ 5 ]

基于注释注入@Component @Value @Resource @Autowired @PostConstruct @PreDestroy等

【Student 】

package com.athl.spring;import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;import javax.annotation.Resource;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;/* 与@Component具有相同功能,不同意义的注解还有三个:    @Repository:注释在Dao实现类上    @Service:注解在Service实现类上    @Controller:注解在处理器上(SpringMVC) */@Component("myStudent")public class Student {    @Value("张三")    private String name;    @Value("22")    private int age;    /*域属性的byType自动注入,只需@Autowired*/    //@Autowired    /*byName自动注入,需要@Qualifier与@Autowired配合使用*/    //@Qualifier("mySchool")    /*@Resource是jdk的注解,版本6及以上版本.*/    //@Resource/*byType自动注入*/    @Resource(name="mySchool")/*byName自动注入*/    private School school;    public void setName(String name) {        this.name = name;    }    public void setAge(int age) {        this.age = age;    }    public void setSchool(School school) {        this.school = school;    }    /*Bean生命周期始末注解*/    @PostConstruct    public void afterInit(){        System.out.println("初始化完毕后");    }    @PreDestroy /*需要显示关闭容器*/    public void preDestroy(){        System.out.println("销毁之前");    }    @Override    public String toString() {        return "Student [name=" + name + ", age=" + age + ", school=" + school                + "]";    }}

【School 】

package com.athl.spring;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Component("mySchool")public class School {    @Value("黄埔军校")    private String name;    public School() {    }    public School(String name) {        this.name = name;    }    public void setName(String name) {        this.name = name;    }    @Override    public String toString() {        return "School [name=" + name + "]";    }}

【applicationContext.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         http://www.springframework.org/schema/context/spring-context.xsd">    <!-- 扫描com.athl这个包及其子包 -->    <!-- <context:component-scan base-package="com.athl"/> -->    <!-- 扫描com.athl的所有子包 -->    <!-- <context:component-scan base-package="com.athl.*"/> -->    <context:component-scan base-package="com.athl.spring"/>    <!-- 注解与xml同时使用 -->    <!--         注解好处:配置方便,直观;              缺点:修改需要重新编译代码。        xml好处:修改无须重新编译。        同时使用,xml的优先级要高于注解.若要修改修改配置文件即可。        那么Bean类要有setter或构造器.     --></beans>

【Test】

package com.athl.test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class MyTest {    @Test    public void run(){        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");        System.out.println(ac.getBean("myStudent"));        /*显示关闭容器*/        ((ClassPathXmlApplicationContext)ac).close();    }}

源码下载：http://download.csdn.net/detail/jul_11th/9741743

谢谢支持！