request.setCharacterEncoding("GBK");

response.setContentType("text/html;charset=GBK")

 package cn.servlet;

 import java.io.IOException;

 import java.io.PrintWriter;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 public class Login extends HttpServlet {

     public void doGet(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         request.setCharacterEncoding("GBK");//解决乱码

         response.setContentType("text/html;charset=GBK");//解决乱码

         String name=request.getParameter("login");

         String password=request.getParameter("password");

         response.setCharacterEncoding("GBK");

         PrintWriter out = response.getWriter();

         out.println("欢迎-- "+name+" --登录！"+"</br>");

         out.print("你的登录密码是："+password);

     }

     public void doPost(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         this.doGet(request, response);

     }

 }