public static String httpGet(String url, String charset)
   throws HttpException, IOException {
  String json = null;
  HttpGet httpGet = new HttpGet();
  // 设置参数
  try {
   httpGet.setURI(new URI(url));
  } catch (URISyntaxException e) {
   throw new HttpException("请求url格式错误。"+e.getMessage());
  }
  // 发送请求
  HttpResponse httpResponse = client.execute(httpGet);
  // 获取返回的数据
  HttpEntity entity = httpResponse.getEntity();
  byte[] body = EntityUtils.toByteArray(entity);
  StatusLine sL = httpResponse.getStatusLine();
  int statusCode = sL.getStatusCode();
  if (statusCode == 200) {
   json = new String(body, charset);
   entity.consumeContent();
  } else {
   throw new HttpException("statusCode="+statusCode);
  }
  return json;
}

/**
  * 发送http get请求
  * 
  * @param getUrl
  * @return
  */
  public String sendGetRequest(String getUrl)
  {
   StringBuffer sb = new StringBuffer();
   InputStreamReader isr = null;
   BufferedReader br = null;
   try
   {
     URL url = new URL(getUrl);
     URLConnection urlConnection = url.openConnection();
     urlConnection.setAllowUserInteraction(false);
     isr = new InputStreamReader(url.openStream());
     br = new BufferedReader(isr);
     String line;
     while ((line = br.readLine()) != null)
     {
      sb.append(line);
     }
   }
   catch (IOException e)
   {
     e.printStackTrace();
   }
   finally
   {
     fileOperator.closeResources(isr, br);
   }
   return sb.toString();
  }
}