黑莓 如果失败重试连接的最佳方法？

Question

我有以下代码，如果在处理请求时发生异常，我希望能够重新启动线程。

线程的 run 方法中如下：

int status = httpConn.getResponseCode();

                        if (status == HttpConnection.HTTP_OK) {
                            // Is this html?
                            String contentType = httpConn
                                    .getHeaderField(HEADER_CONTENTTYPE);
                            boolean htmlContent = (contentType != null && contentType
                                    .startsWith(CONTENTTYPE_TEXTHTML));

                            InputStream input = s.openInputStream();

                            byte[] data = new byte[1000];
                            int len = 0;
                            int size = 0;
                            StringBuffer raw = new StringBuffer();

                            while (-1 != (len = input.read(data))) {
                                // Exit condition for the thread. An
                                // IOException
                                // is
                                // thrown because of the call to
                                // httpConn.close(),
                                // causing the thread to terminate.
                                if (_stop) {
                                    httpConn.close();
                                    s.close();
                                    input.close();
                                }
                                raw.append(new String(data, 0, len));
                                size += len;
                            }

                            // raw.insert(0, "bytes received]\n");
                            // raw.insert(0, size);
                            // raw.insert(0, '[');
                            content = raw.toString();

                            if (htmlContent) {
                                content = prepareData(raw.toString());
                            }
                            input.close();
                        } else {
                             try{
                                httpConn.close();
                             }catch (Exception e) {
                                // TODO: handle exception
                            }
                             errorDialog(status+", status code");

                            retryFeed(getUrl(), "Network error. Retrying...");

                        }
                        s.close();
                    } else {



                        errorDialog("Sorry Insufficient Network Coverage.");
                        return;
                    }
                } catch (IOCancelledException e) {

                      errorDialog(e.getMessage());
                    retryFeed(getUrl(), "Network error. Retrying...");
                } catch (IOException e) {

                    errorDialog(e.getMessage());
                    retryFeed(getUrl(), "Network error. Retrying...");
                }

如果连接失败，重试连接的最安全方法是什么？

谢谢。

//New 这是错误线程。检查连接中的错误...这有帮助吗？这是最有效的方法吗？谢谢..

/错误线程 - 检查错误的线程/ 私有类 ErrorThread 扩展 Thread { 私有静态最终 int 超时 = 3000; // 每 3 秒 私有布尔 hasException = false; 私有字符串_theUrl；

    /**
     * Stops this thread from listening for messages
     */
    private synchronized void stop()
    {
       hasException =false;
    }   

    /**
     * Listens for incoming messages until stop() is called
     * @see #stop()
     * @see java.lang.Runnable#run()
     */
    public void run()
    {
        try 
        {    

              while (true) {



                  if((hasException==true))
                  {
                      // Synchronize here so that we don't end up creating a connection that is never closed.
                    errorDialog("Will Fetch new");
                      synchronized(this)  
                      {
                          hasException=false;
                            if (!_connectionThread.isStarted()) {


                            fetchPage(_theUrl);
                        } else {

                            createNewFetch(_theUrl);

                        }

                      }

                }
                    try {

                        //errorDialog("No exception.");

                        sleep(TIMEOUT);

                    } catch (InterruptedException e) 
                    {

                        errorDialog("Exceptions"+e.toString()+e.getMessage());
                        System.exit(1);
                        //System.exit(0);/*Kill System*/
                    }


              }




        } 
        catch (Exception except)
        {                             

        }
    }

    public void setActive(boolean exception,String url)
    {
        this.hasException=exception;
        this._theUrl=url;

    }

}

Answer 1

如果连接失败，通常您需要关闭它，暂停一小会儿，然后重试。暂停的目的是防止您的设备投入过多的资源来尝试连接有问题的服务器。