06-SpringBoot之WEB(四)—— 配置AOP切面

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1. 添加AOP依赖

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

2. 编写切面类

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;

/**
 * Created by HuangJun
 * 11:24 2018/11/9
 */
@Aspect
@Component
public class MyAspect {
    @Pointcut("execution(public * com.springboot.web.controller..*.*(..))")
    public void myAspect() {
    }

    /***
     * 前置通知
     * @param joinPoint
     * @throws Throwable
     */
    @Before("myAspect()")
    public void doBefore(JoinPoint joinPoint) throws Throwable {
        System.out.println( "===============前置通知 Start===================");
        // 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()));

        System.out.println( "===============前置通知 End===================");

    }

    /***
     * 后置通知
     */
    @After("myAspect()")
    public void doAfter(JoinPoint joinPoint){
        System.out.println( "===============后置通知 Start===================");
        System.out.println( "===============后置通知 End===================");
    }

    /***
     * 环绕通知
     */
    @Around("myAspect()")
    public void doAround(ProceedingJoinPoint jointPoint){

        try {
            System.out.println( "===============环绕通知 Start===================");
            String name = (String) jointPoint.proceed();
            jointPoint.proceed();
            System.out.println( "name=" + name);
            System.out.println( "===============环绕通知 End===================");
        } catch (Throwable e) {
            e.printStackTrace();
        }

    }

    /***
     * 返回通知
     */
    @AfterReturning("myAspect()")
    public void doAfterReturning(JoinPoint joinPoint)  {
        System.out.println( "===============返回通知 Start===================");
        System.out.println( "===============返回通知 End===================");
    }

    /***
     * 异常通知
     */
    @AfterThrowing("myAspect()")
    public void doAfterThrowing(JoinPoint joinPoint){
        System.out.println( "===============异常通知 Start===================");
        System.out.println( "===============异常通知 End===================");
    }

}

3. 运行结果

浏览器访问http://localhost:8080/test/freemarker，控制台打印输出结果
这是实际运行结果，但仔细观察这并不是我们期望的结果，这是因为环绕通知。环绕通知功能强大，但不好把握，我们先暂时把环绕通知注释掉，再运行查看结果：

这是我们期望的结果。

4. 源码下载

源码下载地址：https://download.csdn.net/download/huangjun0210/10774611