[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。