spring_spring范围开始@PostConstruct、与结束注解@PreDestroy

package com.bjsxt.service;import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;import javax.annotation.Resource;import org.springframework.stereotype.Component;import com.bjsxt.dao.UserDao;import com.bjsxt.model.User;@Component("userService")public class UserService {private UserDao userDao;@PostConstructpublic void init() {System.out.println("init");}public UserDao getUserDao() {return userDao;}@Resource(name = "userDaoImpl")public void setUserDao(UserDao userDao) {this.userDao = userDao;}public void add(User user) {userDao.save(user);}@PreDestroypublic void destroy() {System.out.println("destroy");}}