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!