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(shè)置DoInput標(biāo)簽為true。 
  //輸入和輸出是針對(duì)計(jì)算機(jī)的，如果以程序員的角度考慮，經(jīng)常弄混。 
  //input輸入，output輸出，那么不是從output里read，input中write嗎，其實(shí)相反 
  //input輸入進(jìn)計(jì)算機(jī)，計(jì)算機(jī)才能讀，所以是從input read，而output是計(jì)算機(jī)輸出，通過output write。 
  httpConn.setDoOutput(false); 
  //所以如果setDoInput(false)，想從URLConnection讀取時(shí)不能讀取 
  //Cannot read from URLConnection if doInput=false (call setDoInput(true))  
  httpConn.setDoInput(true); 
   
  //連接建立超時(shí)時(shí)間還有讀取數(shù)據(jù)超時(shí)時(shí)間， 
  httpConn.setConnectTimeout(600000); 
  httpConn.setReadTimeout(600000); 
  httpConn.setRequestMethod("GET"); 
  httpConn.connect(); 
  
  //獲取狀態(tài)碼 
  int code = httpConn.getResponseCode(); 
  System.out.println(code); 
  //讀http請(qǐng)求響應(yīng) 
  BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream())); 
  String line; 
  while ((line = reader.readLine()) != null) 
  { 
    result = result + line+"\n"; 
  } 
  System.out.println(result); 
  //關(guān)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); 
}