java - FutureTask 如何管理线程..？

Question

我正在尝试将请求发送到服务器...直到请求没有响应我想执行一个打印整数的循环..问题是我的循环一直持续下去，如果我执行它直到 100 它会打印 100 个值并且如果直到 1000，它就会打印 1000。我想要的是循环应该取决于响应。一旦发生响应，循环线程就应该停止...

  public class ServiceInteraction {
  FutureTask<JSONArray> task;
  public JSONArray addUser(List<BasicNameValuePair> postPairs_interaction){
    JSONArray jArray;
    task = new FutureTask<JSONArray>(new Service_C(postPairs_interaction));
    ExecutorService pool = Executors.newFixedThreadPool(2);
    pool.submit(task);
    for(int i = 0 ; i < 1000; i++){
        System.out.println("value is "+i);
    }//End of for loop
    try{
        return (jArray = task.get());
    }catch(InterruptedException e){
        return null;
    }catch(ExecutionException e){
        return null;
    }
  }//End Of addUser

这是我的 service_c 类代码...

public Service_C(List<BasicNameValuePair> postPairs) {
    this.postPairs = postPairs;
}

@Override
public JSONArray call() throws Exception {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost post = new      HttpPost("http://10.0.0.62:8080/IDocWS/"+postPairs.get(0).getValue());
    post.setEntity(new UrlEncodedFormEntity(postPairs));
    ResponseHandler respHandler = new BasicResponseHandler();
    String responseData = (String) httpclient.execute(post,respHandler);

    try {
        JSONArray jArray;
        jArray = new JSONArray(responseData);
        return jArray;

    } catch (JSONException ex) {
        Logger.getLogger(Service.class.getName()).log(Level.SEVERE, null, ex);
        System.out.println("Error in getting response from the user");
        return null;
    }
}//End of call method

Answer 1

你可以试试这个:

 for (int i = 0;;i++){
        if (task.isDone()) {
              break;
        }
        System.out.println("value is "+i);
 }