request获得post中的json数据

1：

 /** 
     * 从客户端传来的请求流中获得请求参数 
     * @param request 
     * @return String  
 
     */  
    public static String getParamByStream(HttpServletRequest request){  
        String param = \"\";  
        InputStream is = null;  
        InputStreamReader isr = null;  
        BufferedReader br = null;  
        try {  
            StringBuffer sb = new StringBuffer();  
            is = request.getInputStream();  
            isr = new InputStreamReader(is, \"UTF-8\");  
            br = new BufferedReader(isr);  
            String s = \"\";  
            while ((s = br.readLine()) != null) {  
                sb.append(s);  
            }  
            param = sb.toString();  
            param = URLDecoder.decode(param, \"UTF-8\");  
        } catch (IOException e) {  
            e.printStackTrace();  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                if (br != null) {  
                    br.close();  
                }  
                if (isr != null) {  
                    isr.close();  
                }  
                if (is != null) {  
                    is.close();  
                }  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
        return param;  
          
    }