ApacheHttpComponents5：使用HttpAsyncClientPOST表單資料-有解無憂

我正在尋找使用 POST 表單資料的解決方案HttpAsyncClient。到目前為止，我發現的所有示例都只發送了簡單的 GET 請求。這是我到目前為止所得到的：

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");
    }
  }
}

我還查看了源代碼，在那里找到了SimpleHttpRequest::setBody方法和相應的SimpleBody類。但它們似乎也不支持表單資料。

基本上，我需要相當于OkHttp's FormBody。

uj5u.com熱心網友回復：

在對 Apache HttpComponents 5 的檔案和源代碼進行了一些挖掘之后，我想出了以下解決方案。SimpleHttpRequests我需要創建一個AsyncRequestProducer和一個，而不是使用AsyncResponseConsumer。請求生產者物件定義了如何創建我的請求，與相比SimpleHttpRequest，它還能夠生成我需要的表單主體。示例代碼：

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 anAsyncEntityProducer來生成表單主體：

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();

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標籤：爪哇异步 apache-http组件

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