HttpServletRequest 详细信息使用 @Async Spring 返回 null [英] HttpServletRequest details returning null with @Async Spring

问题描述

我想提取传入请求的 URI.

I would like to extract the URI of an incoming request.

我的应用程序中有以下代码 - @RequestMapping 是 @Async.我想通过 request.getRequestURI() 提取路径 URI，但是当 @Async 注释存在时它返回 null，否则，当事实并非如此，输出符合要求.这是预期的行为，如果是，为什么?以及如何使用 @Async 获得相同的输出?删除 @Async 对我来说不是一个简单的选择，因为我想用它来提高性能.

I have the following code in my application - a @RequestMapping which is @Async. I would like to extract the path URI via request.getRequestURI() but it returns null when the @Async annotation is present, otherwise, when it is not, the output is as desired. Is this intended behaviour, if so, why? And how can I obtain the same output with @Async? Removing @Async is not an easy option for me as I would like to use it for performance.

@Async
@RequestMapping("{name}/**")
@ResponseBody
public void incomingRequest(
        @PathVariable("name") String name,
        HttpMethod method,
        HttpServletRequest request,
        HttpServletResponse response)
{
    String URI = request.getRequestURI(); // <-- null with @Async
}

好像一般情况下所有请求相关的参数都丢失了，这不是我想要的；我需要为我的程序提取它们.

It seems that in general, all request related parameters are being lost, which is not what I want; I need to extract them for my program.

推荐答案

我能找到的最接近 HttpServletRequest 空的原因的线索是对这个帖子的答案的评论:HttpServletRequest 对象的生命周期是什么?

The closest clue to the reason of empty HttpServletRequest I could find was comment to the answer on this post: What is a life of HttpServletRequest object?

要解决您的问题，您可以在这里尝试两种方法:

To solve your issue you can try 2 approaches here:

1. 由于您的方法是 void，您可以从 incomingRequest 方法手动启动一个新线程，例如使用 CompletableFuture.

1. Since your method is void you can manually start a new thread from incomingRequest method using, for example, CompletableFuture.

或者，尝试从您的方法中返回 CompletableFuture，如下所示:

Or, try with returning CompletableFuture from your method, like so:

@Async
@RequestMapping("{name}/**")
@ResponseBody
public CompletableFuture<Void> incomingRequest(
        @PathVariable("name") String name,
        HttpMethod method,
        HttpServletRequest request,
        HttpServletResponse response)
{
    String URI = request.getRequestURI(); // should get the right non null path
    return CompletableFuture.completedFuture(null);
}

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