记录两个http调用方法

/**
 * http发送post请求
 * @param url
 * @param param
 * @return
 */
public static String sendPost(String url, String param) {
   PrintWriter out = null;
   BufferedReader in = null;
   String result = "";
   try {
      URL realUrl = new URL(url);
      // 打开和URL之间的连接
      URLConnection conn = realUrl.openConnection();
      // 设置通用的请求属性
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("user-agent",
            "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
      conn.setRequestProperty("Content-Type", "application/json");
      // 发送POST请求必须设置如下两行
      conn.setDoOutput(true);
      conn.setDoInput(true);
      // 获取URLConnection对象对应的输出流
      out = new PrintWriter(conn.getOutputStream());
      // 发送请求参数
      out.print(param);
      // flush输出流的缓冲
      out.flush();
      // 定义BufferedReader输入流来读取URL的响应
      in = new BufferedReader(
            new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
         result += line;
      }
   } catch (Exception e) {
      logger.error("发送 POST 请求出现异常！"+e);
      e.printStackTrace();
   }
   //使用finally块来关闭输出流、输入流
   finally{
      try{
         if(out!=null){
            out.close();
         }
         if(in!=null){
            in.close();
         }
      }
      catch(IOException ex){
         ex.printStackTrace();
      }
   }
   return result;
}

/**
    * http发送get请求
    * @param url
    * @param param
    * @return
    */
   public static String sendGet(String url, String param) {
      String result = "";
      BufferedReader in = null;
      try {
         String urlNameString = url + "?" + param;
         URL realUrl = new URL(urlNameString);
         // 打开和URL之间的连接
         URLConnection connection = realUrl.openConnection();
         // 设置通用的请求属性
         connection.setRequestProperty("accept", "*/*");
         connection.setRequestProperty("connection", "Keep-Alive");
         connection.setRequestProperty("user-agent",
               "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
         // 建立实际的连接
         connection.connect();
         // 获取所有响应头字段
//       Map<String, List<String>> map = connection.getHeaderFields();
         // 遍历所有的响应头字段
         // 定义 BufferedReader输入流来读取URL的响应
         in = new BufferedReader(new InputStreamReader(
               connection.getInputStream()));
         String line;
         while ((line = in.readLine()) != null) {
            result += line;
         }
      } catch (Exception e) {
         logger.error("发送GET请求出现异常！" + e);
         e.printStackTrace();
      }
      // 使用finally块来关闭输入流
      finally {
         try {
            if (in != null) {
               in.close();
            }
         } catch (Exception e2) {
            e2.printStackTrace();
         }
      }
      return result;
   }