实现登录成功自动跳转

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	
	    
	
	
	

  
  
  
    <%	
    	String message = (String)application.getAttribute("message"); 
    	out.write(message);
    
    %>
  

package day6;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ResponseDemo2 extends HttpServlet {

	/**
	 * The doGet method of the servlet. 

	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		//test1(response);
		//test2(response);
		test3(request, response);
	}

	private void test3(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String data = "恭喜你登录成功,本大爷将在3秒后跳转,如果没有跳转,点我一下";
		this.getServletContext().setAttribute("message", data);
		//转发
		this.getServletContext().getRequestDispatcher("/message.jsp").forward(request, response);
	}

	private void test2(HttpServletResponse response) throws IOException {
		response.setHeader("refresh", "3;url='/day6/index.jsp'");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		response.getWriter().write("恭喜你登录成功,本大爷将在3秒后跳转,如果没有跳转,点我一下");
	}

	private void test1(HttpServletResponse response) throws IOException {
		//刷新,每隔3秒
		response.setHeader("refresh", "3");
		String data = new Random().nextInt(100000)+"";
		response.getWriter().write(data);
	}

	/**
	 * The doPost method of the servlet. 

	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("");
		out.println("");
		out.println("  ");
		out.println("  ");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method");
		out.println("  ");
		out.println("");
		out.flush();
		out.close();
	}

}