JSP实现简单的在线留言板

言曌 2017年07月20日10:47:02 7 6395 views

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效果图如下

没有用到数据库，只是用 Session 来存储 List。

代码如下

Message.java (JavaBean)

2、MessageServlet.java

package com.liuyanzhao.servlet;
import com.liuyanzhao.bean.Message;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class MessageServlet extends HttpServlet {
List<Message> list = new ArrayList();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//防止中文乱码
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
String name = request.getParameter("name");
String title = request.getParameter("title");
String content = request.getParameter("content");
Date createTime = new Date();
Message message = new Message();
message.setName(name);
message.setTitile(title);
message.setContent(content);
message.setCreateTime(createTime);
list.add(message);
HttpSession session = request.getSession();
session.setAttribute("messageList",list);
response.sendRedirect("index.jsp");
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp);
}
}

index.jsp (视图层)

<%@ page import="com.liuyanzhao.bean.Message" %>
<%@ page import="java.util.List" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<table>
<form action="message" method="post">
<tr>
<td>用户名</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>标题</td>
<td><input type="text" name="title"></td>
</tr>
<tr>
<td>内容</td>
<td><textarea name="content" id="" cols="30" rows="10"></textarea></td>
</tr>
<tr>
<td colspan="2"> <input type="submit" value="提交"></td>
</tr>
</form>
</table>
<%
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日hh时mm分ss秒");
List list = (List) session.getAttribute("messageList");
if(list != null) {
for(int i=0;i<list.size();i++) {
Message message = (Message) list.get(i);
%>
楼层：<%=i+1%> 楼 <br>
留言人：<%=message.getName()%> <br>
时间：<%=format.format(message.getCreateTime())%> <br>
标题：<%=message.getTitile()%><br>
内容：<%=message.getContent()%><br>
<hr>
<%
}
}
%>
</body>
</html>