Apache HttpComponents 5：POST 使用 HttpAsyncClient 形成数据

Question

我正在寻找 POST 使用 HttpAsyncClient 表单数据的解决方案。到目前为止，我发现的所有 examples 都只发送了简单的 GET 请求。这是我到目前为止所得到的：

try (CloseableHttpAsyncClient client = HttpAsyncClients.createDefault()) {
  SimpleHttpRequest httpPost = SimpleHttpRequests.post("http://httpbin.org");
  // How to add key=value as form data to httpPost?
  Future<SimpleHttpResponse> future = client.execute(httpPost, new FutureCallback<SimpleHttpResponse>() {
    @Override
    public void completed(SimpleHttpResponse simpleHttpResponse) {
      System.out.println(simpleHttpResponse.getCode());
      System.out.println(simpleHttpResponse.getBody());
    }

    @Override
    public void failed(Exception e) {
      System.out.println(e);
    }

    @Override
    public void cancelled() {
      System.out.println("cancelled");
    }
  }
}

我也查看了源代码，在那里我找到了 SimpleHttpRequest::setBody 方法和相应的 SimpleBody class。但它们似乎也不支持表单数据。

基本上，我需要相当于 OkHttp 的 FormBody。

Answer 1

在深入了解 Apache HttpComponents 5 的文档和源代码之后，我想到了以下解决方案。我需要创建一个 AsyncRequestProducer 和一个 AsyncResponseConsumer，而不是使用 SimpleHttpRequests。请求生成器对象定义了如何创建我的请求，与 SimpleHttpRequest 相比，它还能够生成我需要的表单主体。示例代码：

try (CloseableHttpAsyncClient client = HttpAsyncClients.createDefault()) {
  client.start();
  AsyncRequestProducer producer = AsyncRequestBuilder.post()
          .setUri("http://httpbin.org")
          .addParameter("key", "value") // <- form parameters in body
          .build();
  AsyncResponseConsumer<SimpleHttpResponse> consumer = SimpleResponseConsumer.create();
  client.execute(producer, consumer, new FutureCallback<SimpleHttpResponse>() {
    @Override
    public void completed(SimpleHttpResponse simpleHttpResponse) {
      System.out.println(simpleHttpResponse.getCode());
      System.out.println(simpleHttpResponse.getBody());
    }

    @Override
    public void failed(Exception e) {
      System.out.println(e);
    }

    @Override
    public void cancelled() {
      System.out.println("cancelled");
    }
  });
}

或者，我可以使用 AsyncEntityProducer 生成表单正文：

Iterable<NameValuePair> params = Stream.of(new BasicNameValuePair("key", "value"))
        .collect(Collectors.toList());
AsyncEntityProducer entityProducer = AsyncEntityProducers.createUrlEncoded(params, Charsets.UTF_8);
AsyncRequestProducer producer = AsyncRequestBuilder.post()
        .setUri("http://httpbin.org")
        .setEntity(entityProducer)
        .build();

Apache HttpComponents 5：POST 使用 HttpAsyncClient 形成数据

Apache HttpComponents 5: POST form data with HttpAsyncClient

java

asynchronous

apache-httpcomponents