getAnnotations方法上沒有方法

Question

我與AOP春季上市工作的註解之一方法：

@ResponseBody 
@TestAnnotation 
@RequestMapping(method = RequestMethod.PUT, value = "/path/{variable}") 
public return_type controller_call(@PathVariable String variable) { 
    return service.methodName(variable); 
} 

在我已經寫以下代碼的建議：

MethodSignature signature = (MethodSignature) joinPoint.getSignature(); 
    String methodName = signature.getMethod().getName(); 
    Class<?>[] parameterTypes = signature.getMethod().getParameterTypes(); 
    Annotation[] annotations = joinPoint.getTarget().getClass().getMethod(methodName, parameterTypes).getAnnotations(); 

這列出了RequestMapping和ResponseBody註釋，但它沒有列出我的TestAnnotation。

任何想法爲什麼？

Answer 1

對我來說這個工作，也許你做錯了什麼。可能你的示例代碼並不真正反映你的情況。我已經在普通的Java + AspectJ設置中複製了這種情況，只是將Spring庫放在類路徑中，但不能與Spring AOP一起運行。不過，它應該與Spring AOP的結果相同，因爲切入點匹配就像在本機AspectJ中一樣。

樣品註釋：

package de.scrum_master.app; 

import java.lang.annotation.Retention; 
import java.lang.annotation.RetentionPolicy; 

@Retention(RetentionPolicy.RUNTIME) 
public @interface TestAnnotation {} 

樣品類的切入點：

package de.scrum_master.app; 

import org.springframework.web.bind.annotation.PathVariable; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.ResponseBody; 

public class Application { 
    @ResponseBody 
    @TestAnnotation 
    @RequestMapping(method = RequestMethod.PUT, value = "/path/{variable}") 
    public String controller_call(@PathVariable String variable) { 
     return "dummy value"; 
    } 

    public static void main(String[] args) { 
     new Application().controller_call("my/path"); 
    } 
} 

看點與樣品切入點/建議：

package de.scrum_master.aspect; 

import java.lang.annotation.Annotation; 

import org.aspectj.lang.JoinPoint; 
import org.aspectj.lang.annotation.Aspect; 
import org.aspectj.lang.annotation.Before; 
import org.aspectj.lang.reflect.MethodSignature; 

@Aspect 
public class MyAspect { 
    @Before("execution(!static * *..Application.*(..))") 
    public void myAdvice(JoinPoint joinPoint) throws Throwable { 
     System.out.println(joinPoint); 
     MethodSignature signature = (MethodSignature) joinPoint.getSignature(); 
     String methodName = signature.getMethod().getName(); 
     Class<?>[] parameterTypes = signature.getMethod().getParameterTypes(); 
     Annotation[] annotations = joinPoint.getTarget().getClass().getMethod(methodName, parameterTypes).getAnnotations(); 
     for (Annotation annotation : annotations) 
      System.out.println(annotation); 
    } 
} 

控制檯輸出：

execution(String de.scrum_master.app.Application.controller_call(String)) 
@org.springframework.web.bind.annotation.ResponseBody() 
@de.scrum_master.app.TestAnnotation() 
@org.springframework.web.bind.annotation.RequestMapping(headers=[], name=, value=[/path/{variable}], produces=[], method=[PUT], params=[], consumes=[])