从 joinPoint 获取 HTTP 方法答案

【问题标题】：Get HTTP Method from a joinPoint从 joinPoint 获取 HTTP 方法
【发布时间】：2020-01-14 22:56:26
【问题描述】：

我需要从一个方面的joinPoint获取像POST/PATCH/GET/etc这样的http方法。

@Before("isRestController()")
    public void handlePost(JoinPoint point) {
        // do something to get for example "POST" to use below 
        handle(arg, "POST", someMethod::getBeforeActions);
    }

从point.getThis.getClass()，我得到了这个调用被拦截的控制器。然后，如果我从中获取方法，然后是注释。那应该足够好了吧？

所以point.getThis().getClass().getMethod(point.getSignature().getName(), ???) 我如何获得 Class paramaterTypes？

【问题讨论】：

标签： java spring aop spring-aop http-method

【解决方案1】：

以下代码获取所需的控制器方法注释详细信息

    @Before("isRestController()")
public void handlePost(JoinPoint point) {
    MethodSignature signature = (MethodSignature) point.getSignature();
    Method method = signature.getMethod();

    // controller method annotations of type @RequestMapping
    RequestMapping[] reqMappingAnnotations = method
            .getAnnotationsByType(org.springframework.web.bind.annotation.RequestMapping.class);
    for (RequestMapping annotation : reqMappingAnnotations) {
        System.out.println(annotation.toString());
        for (RequestMethod reqMethod : annotation.method()) {
            System.out.println(reqMethod.name());
        }
    }

    // for specific handler methods ( @GetMapping , @PostMapping)
    Annotation[] annos = method.getDeclaredAnnotations();
    for (Annotation anno : annos) {
        if (anno.annotationType()
                .isAnnotationPresent(org.springframework.web.bind.annotation.RequestMapping.class)) {
            reqMappingAnnotations = anno.annotationType()
                    .getAnnotationsByType(org.springframework.web.bind.annotation.RequestMapping.class);
            for (RequestMapping annotation : reqMappingAnnotations) {
                System.out.println(annotation.toString());
                for (RequestMethod reqMethod : annotation.method()) {
                    System.out.println(reqMethod.name());
                }
            }
        }
    }
}

注意：此代码可以进一步优化。分享为一个例子来展示可能性

【讨论】：