public static String getGetMethod(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("Content-Type", "application/json");
             connection.setRequestProperty("Connection", "Keep-Alive");  
             connection.setRequestProperty("Accept-Encoding", "gzip");  
             connection.setRequestProperty("Content-Length", "92"); 
            
             // 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
             for (String key : map.keySet()) {
                 System.out.println(key + "--->" + map.get(key));
             }
             // 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) {
             System.out.println("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;
     //  return pmethod;  
     }

 public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("Connection", "Keep-Alive");  
            conn.setRequestProperty("Accept-Encoding", "gzip");  
            conn.setRequestProperty("Content-Length", "92"); 
            //conn.setRequestProperty("Charset", "GBK");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(),"UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

java post get 请求