spring boot使用AOP切面编程

spring boot使用AOP

1.在pom文件中添加依赖：

<!--spring boot aop切面-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-aop</artifactId>

        </dependency>

2.建立如下所示类：WebLogAspect

3.WebLogAspect类如下：

package com.example.mapper.mybatisMap.aspect;

import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

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;

@Aspect

@Component

public class WebLogAspect {

    private Logger logger = LoggerFactory.getLogger(getClass());

    ThreadLocal<Long> startTime = new ThreadLocal<>();

    /*execution(): 表达式的主体

     *第一个“*”符号: 表示返回值的类型任意

     * com.example.mapper.mybatisMap.controller: AOP所切的服务的包名，即，需要进行横切的业务类

     * 包名后面的“..”: 表示当前包及子包

     * 第二个“*”: 表示类名，* 即所有类

     * .*(..); 表示任何方法名，括号表示参数，两个点表示任何参数类型

     * */

    @Pointcut("execution(public * com.example.mapper.mybatisMap.controller..*.*(..))")

    public void webLog(){}

    @Before("webLog()")

    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();

        //记录下请求

        logger.info("URL : " + request.getRequestURL().toString());

        logger.info("HTTP_METHOD : " + request.getMethod());

        logger.info("IP : " + request.getRemoteAddr());

        logger.info("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());

        logger.info("ARGS : " + Arrays.toString(joinPoint.getArgs()));

    }

    @AfterReturning(returning = "ret", pointcut = "webLog()")

    public void doAfterReturning(Object ret) throws Throwable {

        //处理完请求，返回内容

        logger.info("RESPONSE : " + ret);

        logger.info("SPEND TIME : " + (System.currentTimeMillis() - startTime.get()));

    }

}

4.在com.example.mapper.mybatisMap在建立一个包controller，在controller建立一个HelloController类:

@RestController

public class HelloController {

    private Logger logger = LoggerFactory.getLogger(getClass());

    /**

     * hello world 第一个程序

     * @return

     */

    @RequestMapping("/hello")

    public String hello(){

        return "Hello World!";

    }

}

5.运行程序，访问http://localhost:8080/hello ，控制台输出：

浏览器页面输出：

Hello World!