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  • Java通过反射获取Controller类、方法上注解和注解里的值

    背景

    在进行权限管理方面的开发过程中,尝试通过反射获取匹配的方法的注解,然后得到匹配路径进行鉴权。

    反射获取类的注解@RequestMapping

    //通过反射获取到类,填入类名
    Class cl1 = Class.forName("");
    //获取RequestMapping注解
    RequestMapping anno = (RequestMapping) cl1.getAnnotation(RequestMapping.class);
    //获取类注解的value值  
    String[] value = anno.value();
    //将字符串数组转成字符串
    StringBuilder sb = new StringBuilder();
    for (String ele : value) {
        sb.append(ele);
    }
    String classPath = sb.toString();
    

    反射获取类注解 @GetMapping、@PutMapping、@PostMapping、@DeleteMapping

    //获取类中所有的方法
    Method[] methods = cl1.getDeclaredMethods();
    for (Method method : methods) {
        GetMapping getRequestMothed = (GetMapping) method.getAnnotation(GetMapping.class);
        PutMapping putRequestMothed = (PutMapping) method.getAnnotation(PutMapping.class);
        PostMapping postRequestMothed = (PostMapping) method.getAnnotation(PostMapping.class);
        DeleteMapping deleteRequestMothed = (DeleteMapping)method.getAnnotation(DeleteMapping.class);
       //获取类注解的value值
       String[] value1 = getRequestMothed .value();
       String[] value2 = putRequestMothed .value();
       String[] value3 = postRequestMothed .value();
       String[] value4 = deleteRequestMothed.value();
    } 
    

    反射获取类注解 @ApiOperation

    //获取类中所有的方法
    Method[] methods = cl1.getDeclaredMethods();
    for (Method method : methods) {
       ApiOperation apiOperation = method.getAnnotation(ApiOperation.class);
       //获取方法上@ApiOperation注解的value值
       apiOperationValue = apiOperation.value();
    }
    

    反射获取方法参数类表

    //通过反射获取到类
    String cl1 = Class.forName(string);
    //获取类中所有的方法
    Method[] methods = cl1.getDeclaredMethods();
    for (Method method : methods) {
        //获取方法参数注解
        Annotation[][] parameterAnnotations = method.getParameterAnnotations();
        for (Annotation[] annotations : parameterAnnotations) {
            for (Annotation annotation : annotations) {
                //获取注解名
                String name = annotation.annotationType().getSimpleName();
            }
        }
    }
    
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  • 原文地址:https://www.cnblogs.com/hnxbp/p/14975288.html
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