Spring入门Blog[三、Bean的懒加载和生命周期]
懒加载<?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" default-lazy-init="true"><bean id="userDao" class="com.spring.dao.UserDaoImpl"></bean><bean id="userService" class="com.spring.service.UserServiceImpl" scope="prototype"><property name="userDao" ref="userDao"></property></bean><!-- 这里的懒加载。也就是说在我们程序中真正get指定bean的时候才会实例化这个bean而且也有全局的声明在xml文件上,否则在容器初始化的时候就开始声明初始化实例了。 --><bean id="userAction" class="com.spring.action.UserAction" autowire="byName" lazy-init="true"></bean></beans>生命周期：bean的声明周期是要在配置文件中指定并且要在bean中编写的。下面看两个文件：1、xml配置文件：<bean id="userService" class="com.spring.service.UserServiceImpl" init-method="init" destroy-method="destory"><property name="userDao" ref="userDao"></property></bean>Java文件：public class UserServiceImpl implements UserService{private UserDao userDao;public void init(){System.out.println("init");}public void destory(){System.out.println("destory");}