如何扫描项目中所有 FeignClient 的注解属性信息 - V2EX
sunzy
V2EX    Java

如何扫描项目中所有 FeignClient 的注解属性信息

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  •   sunzy Oct 28, 2020 2647 views
    This topic created in 2033 days ago, the information mentioned may be changed or developed.

    @FeignClient 不是有一些如 name 、url 等的属性信息么 通过applicationContext.getBeansWithAnnotation(FeignClient.class)可以拿到 @FeignClient 的所有 bean 但是由于 @FeignClient 都是 interface,通过getAnnotations()拿不到注解的属性信息, 代码如下,求大神指点一下

     Map<String,Object> beans = applicationContext.getBeansWithAnnotation(FeignClient.class); if (beans.size() > 0){ for (Map.Entry<String, Object> entry : beans.entrySet()){ String beanName = entry.getKey(); Annotation[] annotatiOns= entry.getValue().getClass().getAnnotations(); //空的 AnnotatedType[] annotatedTypes = entry.getValue().getClass().getAnnotatedInterfaces(); for(AnnotatedType annotationType : annotatedTypes){ Type type = annotationType.getType(); Annotation[] typeAnnotatiOns= type.getClass().getAnnotations(); //空的 Annotation[] annotatiOnTypeAnnotations= annotationType.getAnnotations(); //空的 Annotation[] declaredAnnotatiOns= annotationType.getDeclaredAnnotations(); //空的 System.out.println(annotationTypeAnnotations); System.out.println(declaredAnnotations); } } } 
    8 replies    2020-10-28 15:24:15 +08:00
    madworks
        1
    madworks  
       Oct 28, 2020
    你这样试一下,entry.getValue().getClass().getAnnotation(FeignClient.class)
    sunzy
        2
    sunzy  
    OP
       Oct 28, 2020
    @madworks 试了,是 null
    leejoker
        3
    leejoker  
       Oct 28, 2020
    beans.forEach((k, v) -> {
    try {
    if (Proxy.isProxyClass(v.getClass())) {
    InvocationHandler ih = Proxy.getInvocationHandler(v);
    Field targetField = ih.getClass().getDeclaredField("target");
    targetField.setAccessible(true);

    Target target = (Target) targetField.get(ih);
    Field nameField = target.getClass().getDeclaredField("name");
    nameField.setAccessible(true);

    String clientName = (String) nameField.get(target);

    Field urlField = target.getClass().getDeclaredField("url");
    urlField.setAccessible(true);
    String url = (String) urlField.get(target);

    System.out.println("clientName: " + clientName);
    System.out.println("url: " + url);
    }
    } catch (Exception e) {
    log.error("失败,exception={}", ExceptionUtils.getStackTrace(e));
    }
    });
    leejoker
        4
    leejoker  
       Oct 28, 2020
    大概是这样,spring 里的 bean 是通过代理的方式注册的,需要用代理的方式去获取。
    代码是从我写的工具里截取的: https://github.com/leejoker/feign-dev-tool-starter
    sunzy
        5
    sunzy  
    OP
       Oct 28, 2020
    @leejoker 多谢大佬
    DreamSpace
        6
    DreamSpace  
       Oct 28, 2020
    @leejoker 老哥发的链接好像是个 private repository,看不到具体的代码实现
    leejoker
        7
    leejoker  
       Oct 28, 2020
    是的 XD,已经改了
    leejoker
        8
    leejoker  
       Oct 28, 2020
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