spring之AOP小示例

//AOP切面 ：多个切面时，@Order(i)注解来标识切面的优先级。i的值越小，优先级越高
@Order(5)
@Aspect
@Component
public class SysAspect {

    @Pointcut("execution(public * com.zypcy.expend.controller.*.*(..))")
    public void log(){}

    private static final org.slf4j.Logger logger = LoggerFactory.getLogger(SysAspect.class);

    //统计请求的处理时间
    ThreadLocal<Long> startTime = new ThreadLocal<>();

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) throws Throwable{
        startTime.set(System.currentTimeMillis());
        //接收到请求，记录请求内容
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        //记录请求的内容
        System.out.println("Aspect_URL:"+request.getRequestURL().toString());
        System.out.println("Aspect_Method:"+request.getMethod());
    }

    @AfterReturning(returning = "ret" , pointcut = "log()")
    public void doAfterReturning(Object ret){
        //处理完请求后，返回内容
        System.out.println("方法返回值:"+ JSON.toJSONString(ret) +",方法执行时间:"+ (System.currentTimeMillis() - startTime.get()));
    }
}