spring的aop学习

最新推荐文章于 2025-03-22 10:41:44 发布

原创最新推荐文章于 2025-03-22 10:41:44 发布 · 178 阅读

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aop：oriented aspect programming

功能：实现登陆拦截在aop中计算每个方法的执行时间
导入jar包应该选择下面第二个1.9.4的。第一个会有问题。不生效

execution表达式：

@PointCut("execution(* jinsong.liang.controller..*.*(..))")

/**
    第一个* : 所有返回类型
    jinsong.liang.controller包路径
    .. : 所有包和其子包
    第二个* : 所有的java类
    之后的 .* 所有的方法名的方法
    (..) : 括号表示参数，表示任意参数类型
*/

具体实现：

@Component
@Aspect
@Log4j2
public class MyInterceptor {
    @Pointcut("execution(* jinsong.liang.controller..*.*(..))")
    public void log() {

    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        log.info("方法执行前：");
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = requestAttributes.getRequest();
        log.info("登陆ip{}", request.getRemoteHost());
        log.info("执行方法{}", request.getMethod());
        log.info("class_method:{},{}", joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName());
    }

    @After("log()")
    public void doAfter(JoinPoint joinPoint) {
        log.info("方法执行完毕！");
    }

    @Around("log()")
    public Object doAround(ProceedingJoinPoint pjp) {
        long startTime = System.currentTimeMillis();
        Object proceed = null;
        try {
            proceed = pjp.proceed();
            /**
             * 设置登陆拦截 如果session里登陆信息过期 手动转发到/login
             */
//            ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
//            HttpServletRequest request = requestAttributes.getRequest();
//            User user = (User) request.getSession().getAttribute("user");
//            if (user == null) {
//                requestAttributes.getResponse().sendRedirect("/login");
//            }
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
        log.info("方法执行耗时{}ms", System.currentTimeMillis() - startTime);
        return proceed;
    }
}

另一种计算方法耗时：

@Component
@Aspect
@Log4j2
public class MyInterceptor {
    private Long startTime;

    @Pointcut("execution(* jinsong.liang.controller..*.*(..))")
    public void log() {

    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        log.info("方法执行前：");
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = requestAttributes.getRequest();
        log.info("登陆ip{}", request.getRemoteHost());
        log.info("执行方法{}", request.getMethod());
        log.info("class_method:{},{}", joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName());
        startTime = System.currentTimeMillis();
    }

    @After("log()")
    public void doAfter(JoinPoint joinPoint) {
        log.info("方法执行完毕！耗时{}", System.currentTimeMillis() - startTime);
    }
}