@Scope、@PostConstruct、@PreDestroy

一、        @Scope、@PostConstruct、@PreDestroy

@Scope对应于xml配置文件的scope属性

@PostConstruct对应于xml配置文件中的init-method属性

@PreDestroy对于应于xml配置文件中的destroy-method属性

java代码：

 例如如下：
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
 import javax.annotation.Resource;
 import org.springframework.context.annotation.Scope;
 import org.springframework.stereotype.Component;
 @Component(value="userService")
 @Scope("singleton")
 public class UserService {
     @PostConstruct
     public void init(){System.out.println("现在开始初始化UserService");}
     private UserDao userDao = new UserDaoImpl();
     public UserDao getUserDao() {return userDao;}
     @Resource
     public void setUserDao(UserDao userDao) {this.userDao = userDao;}
     public void add(User u){    userDao.save(u);}
     @PreDestroy
     public void destroy(){System.out.println("destory");    }
@PostConstruct
public void postConstruct(){
    log.info("调用postConstruct");
}