[java]增删改查后给出操作提示后跳转到数据列表的小问题解决[简单实现]
(1) 数据列表 all.jsp <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.7.1.min.js"></script> </head> <body> 数据列表<br/><a href="${pageContext.request.contextPath }/test/add.jsp">添加</a> </body></html>
(2) 点击“添加”----> 添加数据页面 add.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"> </head> <body><a href="${pageContext.request.contextPath }/MyServlet?method=add">确定添加</a> </body></html>
(3) 确定添加----->Servlet处理添加，并保存提示信息
package com.test.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class MyServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String type = request.getParameter("method");if ("add".equals(type)) {this.add(request, response);} else if ("all".equals(type)) {this.all(request, response);}}//添加public void add(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("执行添加");request.getSession().setAttribute("userMessage", "操作成功!");//用session保存提示信息response.sendRedirect("./test/tip.jsp");//重定向到全查询}//全查询public void all(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("全查询");request.getRequestDispatcher("./test/all.jsp").forward(request,response);}}
(4)执行添加后，到操作提示页面 tip.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.7.1.min.js"></script><script type="text/javascript">var t="${userMessage}";$(function(){if(t!=null&&t!=""&&t!='null'&&t.length>1){$("#mydiv").fadeIn(1000);$("#mydiv").fadeOut(1000);}});window.setTimeout(back,2000);function back(){window.location.href="${pageContext.request.contextPath}/MyServlet?method=all";}</script> </head> <body><div id="mydiv" style="position:absolute;top:50%;left:45%;margin:-100px 0 0 -100px; border:1 solid black;height:200;width:300;display:none;">${userMessage }</div><%session.removeAttribute("userMessage"); %> </body></html>
注：结合jquery淡入淡出效果，先让提示信息淡入，再淡出，总共2000毫秒时间，也就是2秒，设置定时器2秒后跳到全查询。
(5)回到all.jsp，由于到all.jsp是重定向过来的，所以无论怎么刷新，数据是不会重复提交的。当执行完添加后回到全查询，此时不再手动刷新当前页面，点击添加，不做任何操作，再点浏览器的后退按钮，之前的提示信息也不会再显示出来，这样就避免了把提示信息设置在all.jsp上后退重复提示的问题。