17Spring实战：利用AOP实现日志监控

Posted 2022-08-04 大扑棱蛾子

本例用利用AOP来实现记录用户登录的功能。

登录业务

这里我们简单写，在实际使用时与此类似

//用户Bean
package com.codestd.springstudy.log;

public class User 

    private String username;
    private String password;

    public User() 
        super();
    

    public User(String username, String password) 
        super();
        this.username = username;
        this.password = password;
    

业务类

//自定义登录异常
public class AuthenticationException extends Exception 

    private static final long serialVersionUID = -5160585885606759616L;

    public AuthenticationException(String message) 
        super(message);
       


//接口
public interface UserService 
    public void login(User user) throws AuthenticationException;

//实现类
public class UserServiceImpl implements UserService 

    @Override
    public void login(User user) throws AuthenticationException 
        if("admin".equals(user.getUsername()) && "admin".equals(user.getPassword()))
            System.out.println("登录成功");
        else
            throw new AuthenticationException("用户名密码错误!");
        
    

AOP切面

@Aspect
public class LoginMonitor 

    @Pointcut("execution(* com.codestd.springstudy.log.UserService.login(..))")
    public void loginPointcut();

    @Around("loginPointcut()")
    public Object afterLogin(ProceedingJoinPoint point) throws Throwable
        User user = (User) point.getArgs()[0];
        System.out.println(user.getUsername()+"请求登录系统");
        Object obj ;
        try 
            obj = point.proceed();
         catch (Throwable e) 
            System.out.println(user.getUsername()+"登录失败！"+e.getMessage());
            throw e;
        
        System.out.println(user.getUsername()+"已登录系统");
        return obj;
    

配置

<bean id="userService" class="com.codestd.springstudy.log.UserServiceImpl" />
<bean class="com.codestd.springstudy.log.LoginMonitor" />
<aop:aspectj-autoproxy /> <!-- 支持@Aspect注解 -->

测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:log/applicationContext.xml")
public class UserServiceImplTest 

    @Autowired
    private UserService userService;

    @Test
    public void testLogin() throws AuthenticationException 
        User user = new User("admin","admin");
        userService.login(user);
    


/*
admin请求登录系统
登录成功
admin已登录系统
------------------------
admin请求登录系统
admin登录失败！用户名密码错误!
*/