起因

在一次排查接口请求较慢的问题时，发现没有打印请求耗时，而涉及的接口又比较多，无法所有接口都进行更改排查，所以用AOP技术在这个场景进行简单计算就非常的方便，无需改动原有接口

示例

import com.alibaba.fastjson.JSON;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

/**
 * 对所有接口的请求响应做切面处理
 */
@Aspect
@Configuration
public class RequestAopConfig {

    protected Logger log = LoggerFactory.getLogger(this.getClass());

    @Resource
    private HttpServletRequest request;

    private static final ThreadLocal<Long> START_TIME_MILLIS = new ThreadLocal<>();

    @Pointcut("execution(* com.springmvc.controller..*.*(..))")
    public void controllerMethodPointcut() {
    }

    /**
     * 前置通知
     */
    @Before("controllerMethodPointcut()")
    public void before(JoinPoint joinPoint) {
        START_TIME_MILLIS.set(System.currentTimeMillis());
    }

    /**
     * 后置通知
     */
    @AfterReturning(value = "controllerMethodPointcut()", returning = "result")
    public void afterReturning(JoinPoint joinPoint, Object result) {
        String logTemplate = "\n请求开始---URL: {}, Method: {}, Params: {} \n请求方法---ClassName: {}, [Method]: {}, execution time: {}ms \n请求结束---Result: {}";
        log.info(logTemplate, request.getRequestURL(), request.getMethod(), joinPoint.getArgs(), joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName(), (System.currentTimeMillis() - START_TIME_MILLIS.get()), JSON.toJSONString(result));
        START_TIME_MILLIS.remove();
    }

    /**
     * 异常通知
     */
    @AfterThrowing(value = "controllerMethodPointcut()", throwing = "ex")
    public void afterThrowing(JoinPoint joinPoint, Throwable ex) {
        String logTemplate = "--------------- 执行失败 ---------------\n异常请求开始---Send Request URL: {}, Method: {}, Params: {} \n异常请求方法---ClassName: {}, [Method]: {}, execution time: {}ms \n异常请求结束---Exception Message: {}";
        log.error(logTemplate, request.getRequestURL(), request.getMethod(), joinPoint.getArgs(), joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName(), (System.currentTimeMillis() - START_TIME_MILLIS.get()), ex.getMessage());
        START_TIME_MILLIS.remove();
    }

    /**
     * 最终通知
     */
    @After("controllerMethodPointcut()")
    public void after(JoinPoint joinPoint) {
    }

}