17、Spring实战：利用AOP实现日志监控

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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Beanpackage 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

@Aspectpublic 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!*/

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