protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         //post方法：告诉servlet如何去处理文字编码，输出

         response.setCharacterEncoding("utf-8");

         //告诉浏览器如何处理编码

         response.setContentType("text/html;charset=tf-8");

     }

 @Override

     public String getParameter(String name) {

         String value=request.getParameter(name);

         String method=request.getMethod();

         if("get".equalsIgnoreCase(method)){

             try {

                 value=new String(value.getBytes("iso-8859-1"),"utf-8");

             } catch (Exception e) {

                 e.printStackTrace();

             }

         }

         return value;

     }