package com.bebig.service;

import com.bebig.dao.UserDAO;
import com.bebig.model.User;

//逻辑业务层
public class UserService {
    // 构造函数里有一个userDAO对象需要初始化
    public UserService(UserDAO userDAO) {
        super();
        this.userDAO = userDAO;
    }

    private UserDAO userDAO;

    public void add(User u) {
        userDAO.save(u);

    }

    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void init() {
        System.out.println("init.");
    }

    public void destory() {
        System.out.println("destory.");
    }
}
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" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- a service object; we will be profiling its methods -->
    
    <!-- 在启动容器时，如果lazy-init为true，则不启动时不自动创建此对象，在使用时再创建 -->
    <bean id="u" class="com.bebig.dao.impl.UserDAOImpl" lazy-init="true" />
    
    <!-- 指定对象初始化方法、对象销毁方法 -->
    <bean id="userService" class="com.bebig.service.UserService"
        init-method="init" destroy-method="destory">
        <constructor-arg>
            <ref bean="u" />
        </constructor-arg>
    </bean>

</beans>
注意：destroy-methd 不要和prototype一起用，因为在scope为prototype时，由容器自动来销毁对象。