@Component use cases

@component The role of the java Class to spring Manage in container , No <bean id=”” class=””> This configuration , In its place <context component-scan base-package=” Package name ” />, Responsible for scanning all package names under the changed package .

Case study ：

<?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>  

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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");
	}
}

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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 {
	@Autowired
	private UserDaoImpl userDaoImpl;
	@Test
	public void test() {
		// start-up spring Containers , Because it's a test class , So use applicationContext. If it is tomcat No need to start .
		ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext5.xml");
		userDaoImpl=(UserDaoImpl) ac.getBean("impl");
		userDaoImpl.aa();
	}

}

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