Sping--life cycle

最新推荐文章于 2025-11-30 18:24:05 发布

转载最新推荐文章于 2025-11-30 18:24:05 发布 · 54 阅读

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原文链接：http://www.cnblogs.com/wujixing/p/5454029.html

文章标签：

#java

本文通过一个具体的示例展示了Spring框架中如何使用原型作用域来管理bean的生命周期，并对比了单例作用域的行为差异。

bean.xml:

注意, 千万不要后面加上 scope="prototype"

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

  <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">
  </bean>
	
  <bean id="userService" class="com.bjsxt.service.UserService" init-method="init" destroy-method="destroy" scope="prototype">
  	<!-- 
  	<property name="userDAO" ref="u" />
  	 -->
  	 <constructor-arg>
  	 	<ref bean="u"/>
  	 </constructor-arg>
  </bean>
  

</beans>

UserService.java:

package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;



public class UserService {
	
	private UserDAO userDAO;  
	
	public void init() {
		System.out.println("init");
	}
	
	public void add(User user) {
		userDAO.save(user);
	}
	public UserDAO getUserDAO() {
		return userDAO;
	}
	public void setUserDAO(UserDAO userDAO) {
		this.userDAO = userDAO;
	}
	
	public UserService(UserDAO userDAO) {
		super();
		this.userDAO = userDAO;
	}
	
	public void destroy() {
		System.out.println("destroy");
	}
}

UserServiceTest.java:

package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection
//Inverse of Control
public class UserServiceTest {

	@Test
	public void testAdd() throws Exception {
		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
		
		
		UserService service = (UserService)ctx.getBean("userService");
		UserService service2 = (UserService)ctx.getBean("userService");
		
		ctx.destroy();
		
	}

}

结果init, init

去掉scope="prototype", 结果就是init, destroy　　

转载于:https://www.cnblogs.com/wujixing/p/5454029.html