一、常用的场景

1. 请求拦截

通过aop 请求拦截，举个例子，第三方厂商请求平台接口，先去数据库查询该接口，此ip是否有访问权限，有如果就通过，继续下面的逻辑，否则，权限访问拦截，请求到此结束！

2. 异步保存轨迹

见下面案例：说一下思路
也是同理，同样通过拦截器来实现的，利用下的注解即可，案例中柚子
@Aspect
@Pointcut(“execution( * com.gblfy.logboot...*(…))”)//两个…代表所有子目录，最后括号里的两个…代表所有参数
@After
@Around

二、案例实战

2.1. pom

     <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-aop</artifactId></dependency><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId></dependency>

2.2. 自定义注解

package com.gblfy.logboot.annotation;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME)
//注解作用的位置，ElementType.METHOD表示该注解仅能作用于方法上
@Target(ElementType.METHOD)
public @interface Log {String value() default "";
}

2.3. aop拦截

package com.gblfy.logboot;import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;/*** 日志文件记录*/
@Aspect
@Component
public class WebLogAspect {private static final Logger logger = LoggerFactory.getLogger(WebLogAspect.class);@AutowiredHttpServletRequest request;@Pointcut("execution( * com.gblfy.logboot.*.*.*(..))")//两个..代表所有子目录，最后括号里的两个..代表所有参数public void logPointCut() {}@Before("logPointCut()")public void doBefore(JoinPoint joinPoint) throws Throwable {// 接收到请求，记录请求内容ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();HttpServletRequest request = attributes.getRequest();// 记录下请求内容logger.info("请求地址 : " + request.getRequestURL().toString());logger.info("HTTP METHOD : " + request.getMethod());// 获取真实的ip地址//logger.info("IP : " + WebUtils.getIpAddress(request));logger.info("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "."+ joinPoint.getSignature().getName());logger.info("参数 : " + Arrays.toString(joinPoint.getArgs()));
//        loggger.info("参数 : " + joinPoint.getArgs());}@After("logPointCut()")public void doAfter(JoinPoint joinPoint) throws Throwable {System.out.println("request---" + request.getAttribute("aa"));}@Around("logPointCut()")public Object doAround(ProceedingJoinPoint pjp) throws Throwable {long startTime = System.currentTimeMillis();Object ob = pjp.proceed();// ob 为方法的返回值logger.info("耗时 : " + (System.currentTimeMillis() - startTime));return ob;}
}

2.4. 测试类

package com.gblfy.logboot.controller;import com.gblfy.logboot.annotation.Log;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;@RequestMapping("/log")
@RestController("日志控制器")
public class LogController {@Log("测试收集日志")@RequestMapping("/save")public String saveLog(@RequestParam(name = "token") String token,@RequestParam(name = "name") String name,HttpServletRequest request, HttpServletResponse response) {System.out.println("开始收集log"+token+name);request.setAttribute("aa","assddddd");return "收集日志succes333s";}
//    http://localhost:8080/log/save?token=123
}

2.5. 保存日志