如何使用Jersey ContainerRequestFilter和ContainerResponseFilter匹配http请求和响应 [英] How to match http request and response using Jersey ContainerRequestFilter and ContainerResponseFilter

问题描述

我有一个高度并发的服务器，需要实现一些特殊的日志记录。我需要一种简单的方法来将请求与响应相匹配。 ContainerResponseFilter 中的过滤器（）同时包含请求和响应。我怎么都无法访问http帖子内容，因为该流已被读取。

I have a highly concurrent server and need to implement some special logging. I need an easy way to match the request to the response. The filter() in ContainerResponseFilter has both the request and response. How ever I can not access the http post content because the stream has already been read.

我是否可以通过某种方式添加 ID 在 ContainerRequestFilter过滤器（）中以及 ContainerResponseFilter过滤器（）时自动返回叫什么名字？我无法修改真正的应用程序。

Is there some way I can add an ID in the ContainerRequestFilter filter() and somehow have it automatically returned when the ContainerResponseFilter filter() is called? I can not modify the true applications.

我有另一个程序需要处理日志文件并能够将请求与响应匹配。

I have another program that will need to process the log file and be able to match the request to the response.

还有其他任何建议吗？

推荐答案

我能想到的唯一解决方案克隆InputStream（其他链接）。似乎是工作的两倍，但我不知道它是如何实现的（无需编写一堆MessageBodyReaders）。

The only solutions I can think of invloves "Cloning the InputStream" (another link). Seems like double the work, but I don't see how else it can be achieved (without having to write a bunch of MessageBodyReaders).

然后我们可以使用 ContainerRequestContext.setProperty（String，Object） 设置一个可以在整个请求/响应过滤器链中获得的任意属性。在响应过滤器中，您可以使用 ContainerResponseContext.getProperty（String）。

Then we can just use ContainerRequestContext.setProperty(String, Object) to set an arbitrary property than can be obtained throughout the request/response filter chain. In the response filter, you can use ContainerResponseContext.getProperty(String).

这是一个例子，我期待JSON，并使用Jackson ObjectMapper获取JSON Map并获得 id value，然后在上下文中设置属性。

Here's an example, where I am expecting JSON, and using Jackson ObjectMapper to get a JSON Map and getting the id value, then setting the property in the context.

@Provider
public class RequestFilter implements ContainerRequestFilter {

    ObjectMapper mapper = new ObjectMapper();

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        if (!requestContext.getMethod().equalsIgnoreCase("POST")) {
            return;
        }

        InputStream entityStream = requestContext.getEntityStream();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        while ((len = entityStream.read(buffer)) > -1) {
            baos.write(buffer, 0, len);
        }
        baos.flush();

        String contentType = requestContext.getHeaderString(HttpHeaders.CONTENT_TYPE);
        if (MediaType.APPLICATION_JSON.equals(contentType)) {

            // User Jackson ObjectMapper to get JSON as Map
            Map<String, Object> jsonMap = mapper.readValue(
                    new ByteArrayInputStream(baos.toByteArray()),
                    TypeFactory.defaultInstance().constructMapType(
                            Map.class, String.class, Object.class));

            Object id = jsonMap.get("id");
            // Put id into context as property to be retrieved from response filter
            requestContext.setProperty("id", id);
        }

        requestContext.setEntityStream(new ByteArrayInputStream(baos.toByteArray()));
    }
}

以上示例使用Jersey 2.x.如果您使用的是Jersey 1.x，我在 ContainerRequest 中看不到任何方法来设置任何属性，但我想你可以设置一个临时标题

The above example uses Jersey 2.x. If you are using Jersey 1.x, I don't see any method in the ContainerRequest to set any arbitrary property, but I guess you could just set a temporary header

containerRequest.getRequestHeaders().putSingle("X-Temp-ID", id);

然后你可以在响应过滤器中获得标题。

Then you can just get the header in the response filter.

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