@WebServlet(name = "EncodingServlet",urlPatterns = "/e/es")
public class EncodingServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        System.out.println(request.getCharacterEncoding());
        //這裡的引數是在jsp檔案中設定的引數屬性 在獲取引數之前要使用上面的轉碼
 

        System.out.println("POST---username:"+request.getParameter("username"));
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       //同理  這裡的引數也是jsp檔案設定的引數屬性
        String uname = request.getParameter("username");
        //通過iso編碼,將字串uname回退到位元組陣列狀態
 

        byte[] bytes = uname.getBytes("iso-8859-1");
        System.out.println(request.getCharacterEncoding());
        //根據該位元組陣列,建立一個符合utf-8編碼的字串
        uname = new String(bytes,"utf-8");
        System.out.println("GET---username:"+uname);
    }
}