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); 
}