servlet中常用到的工具

1. 解析ajax传来的json字符串，得到json对象

private JSONObject getJsonObject(HttpServletRequest req) {
        StringBuffer json=new StringBuffer();
        String lineString=null;
        BufferedReader reader;
        JSONObject data=null;
        try {
            reader = req.getReader();
            while((lineString=reader.readLine())!=null) {
                json.append(lineString);
            }
             data=JSONObject.fromObject(json.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return data;
    }