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如何使用java.net.http.HttpClient记录请求/响应?

java-http-client java-11 java-9 logging java

6

Abhijit Sarkar · 技术社区 · 7 年前

这个 HttpClient 在Java9中实验性地引入,现在在Java11中是稳定的,但毫不奇怪,几乎没有项目实际使用它。文件几乎不存在。

在进行HTTP调用时,最常见的问题之一是记录请求/响应。您将如何使用 HttpClient 当然,没有在每次通话中手动记录?有没有像所有其他HTTP客户机那样提供的拦截器机制?

2 回复 | 直到 7 年前

1

11

Karol Dowbecki 7 年前

如果我们看看 jdk.internal.net.http.common.DebugLogger System.Logger ,然后将使用 System.LoggerFinder 选择记录器框架。JUL是默认选择。记录器名称为:

jdk.internal.httpclient.debug
jdk.internal.httpclient.hpack.debug

可以通过将它们设置为系统属性来启用它们。例如,与 -Djdk.internal.httpclient.debug=true 将产生:

DEBUG: [main] [147ms] HttpClientImpl(1) proxySelector is sun.net.spi.DefaultProxySelector@6dde5c8c (user-supplied=false)
DEBUG: [main] [183ms] HttpClientImpl(1) ClientImpl (async) send https://http2.github.io/ GET
DEBUG: [main] [189ms] Exchange establishing exchange for https://http2.github.io/ GET,
     proxy=null
DEBUG: [main] [227ms] PlainHttpConnection(?) Initial receive buffer size is: 43690
DEBUG: [main] [237ms] PlainHttpConnection(SocketTube(1)) registering connect event
DEBUG: [HttpClient-1-SelectorManager] [239ms] SelectorAttachment Registering jdk.internal.net.http.PlainHttpConnection$ConnectEvent@354bf356 for 8 (true)
...

2

19

Nathan 5 年前

您可以通过指定 -Djdk.httpclient.HttpClient.log=requests 在Java命令行上。

http://hg.openjdk.java.net/jdk/jdk/file/tip/test/jdk/java/net/httpclient/offline/

根据您希望实现的目标,您也可以使用“DelegatingHttpClient”来拦截和记录请求和响应。

除了JavaAPI文档之外,还有一些高级文档 http://openjdk.java.net/groups/net/httpclient/index.html

补充说明:

jdk.httpclient.HttpClient.log

-Djdk.httpclient.HttpClient.log=
       errors,requests,headers,
       frames[:control:data:window:all],content,ssl,trace,channel,all

3

4

Maxime Carbonneau-Leclerc 7 年前

在我们这边,我们没有找到 -Djdk.internal.httpclient.debug send 但是 sendAsync 方法:

public class HttpClientLoggingDecorator extends HttpClient {

  private static final Logger logger = Logger.getLogger(HttpClientLoggingDecorator.class.getName());

  private final HttpClient client;

  ...

  @Override
  public <T> HttpResponse<T> send(HttpRequest req, HttpResponse.BodyHandler<T> responseBodyHandler)
    throws IOException,
      InterruptedException
  {
    subscribeLoggerToRequest(req);

    HttpResponse<T> response = client.send(req, responseBodyHandler);

    logResponse(response);
    return response;
  }

  private void subscribeLoggerToRequest(HttpRequest req) {
    // define a consumer for how you want to log
    // Consumer<String> bodyConsumer = ...;
    if (req.bodyPublisher().isPresent()) {
      req.bodyPublisher()
              .ifPresent(bodyPublisher -> bodyPublisher.subscribe(new HttpBodySubscriber(bodyConsumer)));
    } else {
      bodyConsumer.accept(NO_REQUEST_BODY);
    }
  }

  private <T> void logResponse(HttpResponse<T> response) {
    // String responseLog = ...;
    logger.info(responseLog);
  }

}

这里是 HttpBodySubscriber

public class HttpBodySubscriber implements Flow.Subscriber<ByteBuffer> {

  private static final long UNBOUNDED = Long.MAX_VALUE;

  private final Consumer<String> logger;

  public HttpBodySubscriber(Consumer<String> logger) {
    this.logger = logger;
  }

  @Override
  public void onSubscribe(Flow.Subscription subscription) {
    subscription.request(UNBOUNDED);
  }

  @Override
  public void onNext(ByteBuffer item) {
    logger.accept(new String(item.array(), StandardCharsets.UTF_8));
  }

  @Override
  public void onError(Throwable throwable) {
  }

  @Override
  public void onComplete() {
  }

}