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本文介紹了Spring AOP和AspectJ采用相同的方法的處理方法，對(duì)大家解決問題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧！

問題描述

我有一個(gè)關(guān)于使用AspectJ和Spring AOP方法攔截的問題。我創(chuàng)建了兩個(gè)批注：@AJTest和@SAOPTest。

package com.test.company;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class AJTestAspect {

    @Pointcut("@annotation(AJTest)")
    public void aJTest() {
    }

    @Around("aJTest()")
    public Object profile(ProceedingJoinPoint joinPoint) throws Throwable {
        final long start = System.currentTimeMillis();
        try {
            return joinPoint.proceed();
        } finally {
            long finish = System.currentTimeMillis() - start;
            System.out.println("Method execution time: " + (start - finish));
        }
    }
}

已注冊

package com.test.company;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AJConfiguration {

    @Bean
    public AJTestAspect ajTestAspect() {
        return new AJTestAspect();
    }
}

和其他

package com.test.company;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class SAOPInterceptor implements MethodInterceptor {

    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        System.out.println("Number of parameters " + methodInvocation.getArguments().length);
        return methodInvocation.getMethod().invoke(methodInvocation.getThis(), methodInvocation.getArguments());
    }
}

并注冊

package com.test.company;

import org.springframework.aop.Advisor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableConfigurationProperties
public class SpringSAOPTestConfiguration {

    @Bean
    public Advisor springAopTestAdvisor() {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression("@annotation(com.test.company.SAOPTest)");
        return new DefaultPointcutAdvisor(pointcut, new SAOPInterceptor());
    }
}

并將其添加到控制器中的我的方法

package com.test.company;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

    @RestController
    public class TestController {
    
        @SAOPTest
        @AJTest
        @GetMapping("/test")
        public String doSomething(@RequestParam("firstParam") String firstParam, @RequestParam("secondParam") Integer secondParam) throws InterruptedException {
            Thread.sleep(2_500);
            return firstParam + " " + secondParam;
        }
    }

應(yīng)用程序類

package com.test.company;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@EnableAspectJAutoProxy
@SpringBootApplication
public class AopTestApplication {
    public static void main(String[] args) {
        SpringApplication.run(AopTestApplication.class, args);
    }
}

但當(dāng)我通過http://localhost:8080/test?firstParam=test&secondParam=2調(diào)用它時(shí)，我看不到與方法執(zhí)行時(shí)間相關(guān)的消息，但可以看到傳遞給該方法的參數(shù)數(shù)量。如果我要?jiǎng)h除@SAOPTest-方法的執(zhí)行時(shí)間按預(yù)期工作，但它不能同時(shí)使用兩個(gè)注釋。是Spring創(chuàng)建的代理對(duì)象有問題，還是我遺漏了什么？

推薦答案

您的偵聽器未正確運(yùn)行。請(qǐng)閱讀MethodInterceptorjavadoc。攔截器應(yīng)如下所示：

public class SAOPInterceptor implements MethodInterceptor {
  @Override
  public Object invoke(MethodInvocation methodInvocation) throws Throwable {
    System.out.println("Number of parameters " + methodInvocation.getArguments().length);
    return methodInvocation.proceed();
  }
}

此外，你的相位計(jì)算時(shí)間也是錯(cuò)誤的。首先，您說finish = System.currentTimeMillis() - start，然后打印start - finish。您應(yīng)該減去finish - start或計(jì)算在變量中花費(fèi)的時(shí)間，但不能同時(shí)計(jì)算兩者，也不能同時(shí)計(jì)算start - finish。為什么不干脆System.out.println("Method execution time: " + (System.currentTimeMillis() - start));？

這篇關(guān)于Spring AOP和AspectJ采用相同的方法的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，