String httpUrl = "https://www.baidu.com/s?ie=UTF-8&tn=90594569_hao_pg&wd=1"; URL url = null; HttpURLConnection httpConn = null; String result = ""; try {   String address = httpUrl;   url = new URL(address);   httpConn = (HttpURLConnection) url.openConnection();      //A URL connection can be used for input and/or output. Set the    //DoInput flag to true if you intend to use the URL connection for input,   //false if not. The default is true.       //URL連接可用于input或output。如果想用URL連接輸入，設置DoInput標簽為true。   //輸入和輸出是針對計算機的，如果以程序員的角度考慮，經常弄混。   //input輸入，output輸出，那么不是從output里read，input中write嗎，其實相反   //input輸入進計算機，計算機才能讀，所以是從input read，而output是計算機輸出，通過output write。   httpConn.setDoOutput(false);   //所以如果setDoInput(false)，想從URLConnection讀取時不能讀取   //Cannot read from URLConnection if doInput=false (call setDoInput(true))    httpConn.setDoInput(true);      //連接建立超時時間還有讀取數據超時時間，   httpConn.setConnectTimeout(600000);   httpConn.setReadTimeout(600000);   httpConn.setRequestMethod("GET");   httpConn.connect();     //獲取狀態碼   int code = httpConn.getResponseCode();   System.out.println(code);   //讀http請求響應   BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));   String line;   while ((line = reader.readLine()) != null)   {     result = result + line+"/n";   }   System.out.println(result);   //關閉IO和連接   reader.close();   httpConn.disconnect(); } catch(Exception e){   log.error(e); } finally{   if(httpConn!=null)     httpConn.disconnect(); } 

catch(Exception e){   for (int i = 0; i < 6; i++) {     Thread t = new Thread(){public void run(){get();}};     t.start();     if(result.equals("ok")){       break;     }     try {       Thread.sleep(300000);     } catch (InterruptedException e2) {       log.error(e2);     }   }   log.error(e); }