Java HttpURLConnection超时和IO异常处理

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连接可用于input或output。如果想用URL连接输入，设置DoInput标签为true。   //输入和输出是针对计算机的，如果以程序员的角度考虑，经常弄混。   //input输入，output输出，那么不是从output里read，input中write吗，其实相反   //input输入进计算机，计算机才能读，所以是从input read，而output是计算机输出，通过output write。   httpConn.setDoOutput(false);   //所以如果setDoInput(false)，想从URLConnection读取时不能读取   //Cannot read from URLConnection if doInput=false (call setDoInput(true))    httpConn.setDoInput(true);      //连接建立超时时间还有读取数据超时时间，   httpConn.setConnectTimeout(600000);   httpConn.setReadTimeout(600000);   httpConn.setRequestMethod("GET");   httpConn.connect();     //获取状态码   int code = httpConn.getResponseCode();   System.out.println(code);   //读http请求响应   BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));   String line;   while ((line = reader.readLine()) != null)   {     result = result + line+"/n";   }   System.out.println(result);   //关闭IO和连接   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); }