java - 在 java 中使用 HttpAsyncClients 实现“即发即忘”

Question

我正在尝试在我的应用程序中使用 HTTPAsyncCLient 来实现“即发即忘”。

http://hc.apache.org/httpcomponents-asyncclient-4.0.x/

我正在遵循此处给出的示例: http://hc.apache.org/httpcomponents-asyncclient-4.0.x/httpasyncclient/examples/org/apache/http/examples/nio/client/AsyncClientHttpExchange.java

我的代码如下所示:

           CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
           httpclient.start();
           HttpGet request = new HttpGet(url);
           Future<HttpResponse> future = httpclient.execute(request, null);
          /*try {
            HttpResponse resp = future.get();
            StringBuilder sb = new StringBuilder();
            BufferedReader reader = new BufferedReader(new InputStreamReader(resp.getEntity().getContent()));
            String line = null;

            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            String fr = sb.toString();
          } catch (InterruptedException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
          } catch (ExecutionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }*/
       httpclient.close();

如果我取消注释部分，一切正常。但我想做的是“即发即忘”请求。因此，当我注释掉上面的部分时，不会发出 HTTP 请求。知道我做错了什么吗？对于“即发即忘”请求，我该怎么办？

Answer 1

在请求完成之前，您的 httpclient 实例无法关闭。

虽然我不确定，但我建议

// ONCE
CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
httpclient.start();


// for every fire and forget request
HttpGet request = new HttpGet(url);
httpclient.execute(request, null);`

在请求之间保持客户端处于 Activity 状态，因此无需调用 close(而是重用实例)