@component使用案例

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@component的作用是将一个java类加入到spring容器中管理，省去了<bean id="" class="">这句配置，取而代之的是<context component-scan base-package="包名" />，负责扫描改包下的所有包名。

案例：

<?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:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"    xmlns:util="http://www.springframework.org/schema/util" 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    http://www.springframework.org/schema/aop     http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  http://www.springframework.org/schema/tx     http://www.springframework.org/schema/tx/spring-tx-4.0.xsd  http://www.springframework.org/schema/context     http://www.springframework.org/schema/context/spring-context-4.0.xsd  http://www.springframework.org/schema/util     http://www.springframework.org/schema/util/spring-util-4.0.xsd  ">           <context:component-scan base-package="com.aa"></context:component-scan>      </beans>

package com.aa;import org.springframework.stereotype.Component;import com.introduce.Model.User2;@Component("impl")public class UserDaoImpl {public User2 getUser2() {return null;}public User2 getUser2(String name) {User2 user2=new User2();user2.setAge(22);System.out.println(name+"s1");return  user2;}public void aa(){System.out.println("bbbbb");}}

import org.junit.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.aa.UserDaoImpl;public class Test4 {@Autowiredprivate UserDaoImpl userDaoImpl;@Testpublic void test() {//启动spring容器，因为是测试类，所以要使用applicationContext.如果是tomcat启动就不用。ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext5.xml");userDaoImpl=(UserDaoImpl) ac.getBean("impl");userDaoImpl.aa();}}

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