springboot中的aop配置（hello world）

1、添加依赖

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

2、添加切面类

package com.example.demo.aop;

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
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;

@Slf4j
@Aspect
@Component
public class LogAspect {
    /**
     * 可以配置多个切面，来对多个切面做操作，方法名称为方法名，并在下边的before登使用
     *
     * 非异常顺序：@Around中的方法-->@Before->controller-->@Around执行完--> @After-->@AfterReturning
     * 异常顺序：@Around中的方法-->@Before->controller-->@Around执行完（不捕获异常）--> @After- @AfterThrowing
     *
     * 另外发现一个很又有的注解@SneakyThrows
     */
    @Pointcut("execution(public * com.example.demo.controller.*.*(..))")
    public void webControllerLog(){}

    @Pointcut("execution(public * com.example.demo.service.*.*(..))")
    public void webServicePractice(){}


    @Before("webServicePractice()")
    public void deServiceBefore(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
        log.info("URL : " + request.getRequestURL().toString());
        System.out.println("URL : " + request.getRequestURL().toString());
        System.out.println("HTTP_METHOD : " + request.getMethod());
        System.out.println("IP : " + request.getRemoteAddr());
        System.out.println("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
        System.out.println("ARGS : " + Arrays.toString(joinPoint.getArgs()));

    }

    @Before("webControllerLog()")
    public void deBefore(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
        System.out.println("URL : " + request.getRequestURL().toString());
        System.out.println("HTTP_METHOD : " + request.getMethod());
        System.out.println("IP : " + request.getRemoteAddr());
        System.out.println("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
        System.out.println("ARGS : " + Arrays.toString(joinPoint.getArgs()));

    }

    //后置最终通知,final增强，不管是抛出异常或者正常退出都会执行
    @After("webControllerLog()")
    public void after(JoinPoint jp){
        System.out.println("方法最后执行.....");
    }

    @AfterReturning(returning = "ret", pointcut = "webControllerLog()")
    public void doAfterReturning(Object ret) throws Throwable {
        // 处理完请求，返回内容
        System.out.println("方法的返回值 : " + ret);
    }

    //后置异常通知
    @AfterThrowing(pointcut = "webControllerLog()",throwing  = "ex")
    public void throwsMethod(JoinPoint jp){
        System.out.println("方法异常时执行.....");
    }


//    /**
//     * 环绕通知,环绕增强，相当于MethodInterceptor
//     * ***可以不配置,并建议不配置，
//     * 如果不配置直接进入before，异常会被捕获到，如果处理了异常则不会进入@AfterThrowing，可以使用 throws Throwable抛出，或者使用@SneakyThrows抛出异常
//     */
//    @SneakyThrows
//    @Around("webControllerLog()")
//    public Object arround(ProceedingJoinPoint pjp) {
//        System.out.println("方法环绕start.....");
////        try {
//            // 进入@before
//            Object o =  pjp.proceed();
//            System.out.println("方法环绕proceed，结果是 :" + o);
//            return o;
////            // 这个地方如果处理异常，如果发成异常则不会进入@AfterThrowing
////        } catch (Throwable e) {
////            e.printStackTrace();
////            return null;
////        }
//    }
}

3、创建一个测试类

package com.example.demo.controller;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * 测试aop
 */
@Slf4j
@Api(tags = "测试aop")
@RestController(value = "/aop")
public class AopController {

    @RequestMapping(value = "/aop",method = RequestMethod.GET,produces = "application/json;charset=UTF-8" )
    @ApiOperation(value = "测试aop",notes = "。。。")
    public String aopMethod(){
        log.info("controller层返回的方法");
        return "aop方法返回";
    }


    @RequestMapping(value = "/aopException",method = RequestMethod.GET,produces = "application/json;charset=UTF-8" )
    @ApiOperation(value = "测试异常aop捕获",notes = "。。。")
    public int exceptionMethod(){
        log.info("aop异常返回的方法");
        return 1/0;
    }
}

4、结果

URL : http://localhost:8080/aop
HTTP_METHOD : GET
IP : 0:0:0:0:0:0:0:1
CLASS_METHOD : com.example.demo.controller.AopController.aopMethod
ARGS : []
2020-05-10 16:16:04.877  INFO 8692 --- [nio-8080-exec-9] c.example.demo.controller.AopController  : controller层返回的方法
方法最后执行.....
方法的返回值 : aop方法返回

具体的注意事项等在代码中有注释，此文只是一个简单的配置没有解释