Java 如何按预定义的秒数终止AsyncTask请求

我试图创建一个处理程序，如果服务器在20秒内没有响应，它将终止http请求。我想知道从异步任务类中实现这一点的最佳方法是什么

这是我的代码：

public class DBcontroller extends AsyncTask <List<NameValuePair>, Void, String>{

    private static String url = "";
    private  Context context = null ;
    public AsyncResponse delegate= null;

    private PropertyReader propertyReader;
    private Properties properties;

    public DBcontroller(Context mycontext,AsyncResponse myresponse) {
        context = mycontext;
        delegate = myresponse;
        propertyReader = new PropertyReader(context);
        properties = propertyReader.getMyProperties("config.properties");
        url = properties.getProperty("url");
    }



    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        delegate.preProcess();



    }

    @Override
    protected String doInBackground(List<NameValuePair>... params) {
        return postDataToServer(params[0]);
    }

    @Override
    protected void onPostExecute(String resStr) {
        super.onPostExecute(resStr);
        delegate.handleResponse(resStr);

    }

    private String postDataToServer(List<NameValuePair> list) {
        //check
        for (int i=0;i<list.size();i++)
            Log.d("responseString", list.get(i).toString());
        //check
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(url);
        String responseString = null;
        try {
            post.setEntity(new UrlEncodedFormEntity(list));
            HttpResponse response = client.execute(post);
            HttpEntity entity = response.getEntity();
            responseString = EntityUtils.toString(entity);
            Log.d("responseString1", responseString);

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if(responseString!= null)
             Log.d("responseString2", responseString);
        return responseString;
    }


}

公共类DBcontroller扩展异步任务{
私有静态字符串url=“”；
私有上下文=null；
公共异步响应委托=null；
私人财产领头人财产领头人；
私人物业;；
公共数据库控制器（上下文mycontext、异步响应myresponse）{
上下文=mycontext；
delegate=myresponse；
propertyReader=新的propertyReader（上下文）；
properties=propertyReader.getMyProperties（“config.properties”）；
url=properties.getProperty（“url”）；
}
@凌驾
受保护的void onPreExecute（）{
super.onPreExecute（）；
proprocess（）；
}
@凌驾
受保护字符串doInBackground（列表…参数）{
返回postDataToServer（参数[0]）；
}
@凌驾
受保护的void onPostExecute（字符串resStr）{
super.onPostExecute（resStr）；
代表HandlerResponse（resStr）；
}
私有字符串postDataToServer（列表）{
//检查
对于（int i=0；i

HttpUrlConnection有一个setConnectionTimeout（）方法，它就是这样做的

HttpURLConnection http = (HttpURLConnection)     mURL.openConnection();
http.setConnectTimeout(15000); //timeout after 15 seconds

使用：

您还可以发布一个处理程序，该处理程序将在Url连接上调用disconnect（）

    new Handler(Looper.getMainLooper()).postDelayed(new Runnable(){
      @Override
      public void run() {
        httpUrlConnection.disconnect();
      }
    }, 5000);

[编辑]

HttpClient到Url转换伪代码-未测试

  @TargetApi(Build.VERSION_CODES.GINGERBREAD)
  public boolean postToServer(String url, String postData, StringBuilder resultData) throws IOException {
    URL at_url = new URL(url);
    int responseCode = 0;
    try {
      HttpURLConnection httpUrlConnection = (HttpURLConnection) at_url.openConnection();

      httpUrlConnection.setUseCaches(false);
      httpUrlConnection.setRequestProperty("User-Agent", "MyAgent");
      httpUrlConnection.setConnectTimeout(30000);
      httpUrlConnection.setReadTimeout(30000);

      httpUrlConnection.setRequestMethod("POST");
      httpUrlConnection.setDoOutput(true);

      OutputStream os = httpUrlConnection.getOutputStream();
      try {
        os.write(postData.getBytes(Charset.forName("UTF-8")));
      } finally {
        os.flush();
        os.close();
      }

      httpUrlConnection.connect();

      String response = "";
      responseCode = httpUrlConnection.getResponseCode();
      if (responseCode == 200) {
        InputStream is = httpUrlConnection.getInputStream();
        response = convertStreamToString(is);
        // Read is to get results
      } else {
        InputStream is = httpUrlConnection.getErrorStream();
        response = convertStreamToString(is);
        // Read is to get error
      }
      resultData.append(response);

    }
    finally {
      // Cleanup
    }
    return responseCode == 200;
  }

我想这可能会对你有所帮助。HttpClient不推荐使用HttpUrlConnection，或者你可以在设置超时的地方使用okhttp。你也可以去掉for循环中的一些代码，可以将它们保留在外部。你有可能帮我用你在我的代码中建议的HttpUrlConnection替换我的HttpClient对象？@matant我已经添加了d一些代码，你应该很容易适应你的需要。
  @TargetApi(Build.VERSION_CODES.GINGERBREAD)
  public boolean postToServer(String url, String postData, StringBuilder resultData) throws IOException {
    URL at_url = new URL(url);
    int responseCode = 0;
    try {
      HttpURLConnection httpUrlConnection = (HttpURLConnection) at_url.openConnection();

      httpUrlConnection.setUseCaches(false);
      httpUrlConnection.setRequestProperty("User-Agent", "MyAgent");
      httpUrlConnection.setConnectTimeout(30000);
      httpUrlConnection.setReadTimeout(30000);

      httpUrlConnection.setRequestMethod("POST");
      httpUrlConnection.setDoOutput(true);

      OutputStream os = httpUrlConnection.getOutputStream();
      try {
        os.write(postData.getBytes(Charset.forName("UTF-8")));
      } finally {
        os.flush();
        os.close();
      }

      httpUrlConnection.connect();

      String response = "";
      responseCode = httpUrlConnection.getResponseCode();
      if (responseCode == 200) {
        InputStream is = httpUrlConnection.getInputStream();
        response = convertStreamToString(is);
        // Read is to get results
      } else {
        InputStream is = httpUrlConnection.getErrorStream();
        response = convertStreamToString(is);
        // Read is to get error
      }
      resultData.append(response);

    }
    finally {
      // Cleanup
    }
    return responseCode == 200;
  }