java将获取到的手机端json串数据转换为java对象

public  static String jsonValue(){String str ="";try {HttpServletRequest request=ServletActionContext.getRequest();ServletInputStream sis = null;request.setCharacterEncoding("UTF-8");sis = request.getInputStream();int len = request.getContentLength();if (len <= 0) {return null;}byte[] buffer = new byte[len];sis.read(buffer);str = new String(buffer, "UTF-8");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}user = JSON.parseObject(str,实体类对象.class);return str;}