Spring JSR-250 注解
Spring还使用基于 JSR-250 注释,它包括 @PostConstruct, @PreDestroy 和 @Resource 注释
Spring @PostConstruct 和 @PreDestroy 注解
它们是bean生命周期的一个钩子, 也就是我们可以利用这两个来监听bean的过程
public class Test
{
@PostConstruct
public void init(){
System.out.println("Bean init ...");
}
@PreDestroy
public void destroy(){
System.out.println("Bean destroy ...");
}
}
Spring @Resource 注解
@Resource 也是用于bean的装配,它是通过 byName 来装配的!用法和 @Autowired 类似
-
@Resource 可注解在成员变量上
@RestController public class HelloController { @Resource private User mUser; }
-
@Resource 可注解在方法上
@RestController public class HelloController { private User mUser; @Resource public void setUser(User user) { this.mUser = user; } }
-
@Resource 可注解在构造函数上
@RestController public class HelloController { private User mUser; @Resource public HelloController(User user) { this.mUser = user; } }
如果bean在容器中有多个,可直接指定名称
@RestController public class HelloController { @Resource(name="user1") private User mUser; public HelloController(User user) { this.mUser = user; } }