解决java web前后台乱码

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //response.getWriter().append("Served at: ").append(request.getContextPath());
        request.setCharacterEncoding("utf-8");//必须写在第一位，因为采用这种方式去读取数据，否则数据会出错。 

        response.setContentType("text/html;charset=utf-8");//设置传过去的页面显示的编码
        String method=request.getParameter("method");
        try {
            if ("show".equals(method)){    
                    show(request,response);
            }
            else if("add".equals(method)){
                add(request, response);
            }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }