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本文介紹了Spring AOP可以建議使用哪種方法，或者Spring AOP連接點的限制是什么？的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我正在使用Spring AOP，我發(fā)現(xiàn)有3種情況，但我不太清楚：
情形1：沒有實現(xiàn)或擴展任何類或接口的單個類
在這種情況下，任何非私有方法都將是連接點

情形2：類實現(xiàn)接口并實現(xiàn)方法
在此縫合中，只有在接口中聲明的方法將是連接點

情形3：類擴展超類并覆蓋超類的方法
在此縫合中，所有子類的方法都不是連接點。

Spring AOP就是這樣設計的嗎？

以下是我使用的代碼：

JdkProxyInterface.java

package com.example.proxytestdemo;

public interface JdkProxyInterface {

    void function(int i);
}

JdkProxy.java

package com.example.proxytestdemo;
import org.springframework.stereotype.Component;

@Component
public class JdkProxy implements JdkProxyInterface {

    @Override
    @TimeIt
    public void function(int i) {
        System.out.println("JdkProxy function");
    }

    @TimeIt
    public void function1(int i) {
        System.out.println("JdkProxy function");
    }

    @TimeIt
    public void function2(int i) {
        System.out.println("JdkProxy function");
    }

}

SubJdkProxy.java

package com.example.proxytestdemo;

import org.springframework.stereotype.Component;

@Component
public class SubJdkProxy extends JdkProxy {

    @TimeIt
    public void functionSubJdkProxy(int i) {
        System.out.println("functionSubJdkProxy");
    }
}

TimeIt.Java

package com.example.proxytestdemo;
import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE,ElementType.METHOD})
@Inherited
public @interface TimeIt {
    boolean enabled() default true;
}

TimePointCut.java

package com.example.proxytestdemo;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;


@Aspect
@Component
public class TimePointCut {

    @Pointcut("execution(* com.example.proxytestdemo..*(..))")
    public void calcTime1() {
    }

    @Around(value = "calcTime1()")
    public Object aspectProcess(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("proxy begin....... ");
        MethodSignature signature = (MethodSignature) pjp.getSignature();
        Method method = signature.getMethod();
        TimeIt annotation = method.getAnnotation(com.example.proxytestdemo.TimeIt.class);
        if (annotation == null) {
            annotation = pjp.getTarget().getClass().getAnnotation(TimeIt.class);
            if (annotation == null) {
                for (Class<?> cls : pjp.getClass().getInterfaces()) {
                    annotation = cls.getAnnotation(TimeIt.class);
                    if (annotation != null) {
                        break;
                    }
                }
            }
        }
        if (annotation != null) {
            System.out.println(annotation.enabled());
        }
        Object o = null;
        long t1 = 0, t2 = 0;
        try {
            t1 = System.currentTimeMillis();
            o = pjp.proceed();
            t2 = System.currentTimeMillis();
        } catch (Exception e) {
            throw e;
        } finally {
            System.out.println("proxy end....... ");
            System.out.println("time cost: "+ (t2-t1)/1000 + "s");
        }

        return o;
    }
}

我發(fā)現(xiàn)不能建議使用JdkProxy.unction1()和JdkProxy.unction2()和SubJdkProxy.unctionSubJdkProxy()。

對不起，由于IDEA的提示，我犯了一個錯誤。IDEA’s hint

推薦答案

您的應用程序應該可以工作。聽著，我嘗試了各種組合，它們都很管用：

驅動程序應用程序：

package com.example.proxytestdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication
public class Application {
  public static void main(String[] args) {
    try (ConfigurableApplicationContext context = SpringApplication.run(Application.class, args)) {
      doStuff(context);
    }
  }

  private static void doStuff(ConfigurableApplicationContext context) {
    JdkProxy jdkProxy = (JdkProxy) context.getBean("jdkProxy");
    jdkProxy.function(11);
    jdkProxy.function1(22);
    jdkProxy.function2(33);
    System.out.println("----------");

    JdkProxyInterface jdkProxyInterface = jdkProxy ;
    jdkProxyInterface.function(11);
    System.out.println("==========");

    SubJdkProxy subJdkProxy = (SubJdkProxy) context.getBean("subJdkProxy");
    subJdkProxy.function(11);
    subJdkProxy.function1(22);
    subJdkProxy.function2(33);
    subJdkProxy.functionSubJdkProxy(44);
    System.out.println("----------");

    jdkProxyInterface = subJdkProxy;
    jdkProxyInterface.function(11);
  }
}

控制臺日志：

execution(void com.example.proxytestdemo.JdkProxy.function(int))
JdkProxy function
execution(void com.example.proxytestdemo.JdkProxy.function1(int))
JdkProxy function
execution(void com.example.proxytestdemo.JdkProxy.function2(int))
JdkProxy function
----------
execution(void com.example.proxytestdemo.JdkProxy.function(int))
JdkProxy function
==========
execution(void com.example.proxytestdemo.JdkProxy.function(int))
JdkProxy function
execution(void com.example.proxytestdemo.JdkProxy.function1(int))
JdkProxy function
execution(void com.example.proxytestdemo.JdkProxy.function2(int))
JdkProxy function
execution(void com.example.proxytestdemo.SubJdkProxy.functionSubJdkProxy(int))
functionSubJdkProxy
----------
execution(void com.example.proxytestdemo.JdkProxy.function(int))
JdkProxy function

順便說一句，為了專注于基礎工作，我將方面的建議方法簡化為：

      @Around(value = "calcTime1()")
      public Object aspectProcess(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println(pjp);
        return pjp.proceed();
      }

更新：

Spring Boot默認為CGLIB代理模式，當前無法輕松重新配置為使用JDK代理，因為相應的注釋被忽略或被取代，請參見issue #12194。但我找到了一種方法，見my comment on Spring Boot #27375。您需要將此內容放入application.properties：