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");
}
}
beans.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"
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>
@Test
public void testAdd() throws Exception {
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); UserService service = (UserService)ctx.getBean("userService");
UserService service2 = (UserService)ctx.getBean("userService"); //一般来说 不要和protytyoe混用 这样看不到destory 如果是singleton 则看到两次init 两次deatory ctx.destroy(); }
加上lazy-init的话 对象第一次不初始化 只是在使用的时候才初始化 用的比较少