message.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>留言给我</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
<!--
textarea {
FONT: 12px Tahoma;
COLOR: #333333;
margin-top: 3px;
margin-bottom: 3px;
}
.input1 {
width: 300px;
height: 25px;
margin-top: 3px;
margin-bottom: 3px;
}
.input2 {
width: 150px;
height: 25px;
margin-top: 3px;
margin-bottom: 3px;
}
.submit1 {
width: 50px;
border: #CCCCCC solid 1px;
height: 30px;
background: #FFFFFF
}
#form1 tr th {
text-align: right;
}
input {
text-align: left;
}
body {
font-family: "微软雅黑", Verdana, sans-serif, "宋体";
color: #333;
}
.mybutton {
width: 70px;
height: 25px;
margin-top: 5px;
margin-bottom: 5px;
text-align: center;
}
h1 {
margin-top: 100px;
margin-bottom: 50px;
color: #999;
font-weight: bold;
font-size: 36px;
}
-->
</style>
<script>
function addCheck() {
var name = document.getElementById("name").value;
var title = document.getElementById("title").value;
var content = document.getElementById("content").value;
if (name == "") {
alert("姓名容都不能为空!")
document.getElementById("name").focus();
return false;
}
if (title == "") {
alert("主题都不能为空!")
document.getElementById("title").focus();
return false;
}
if (content == "") {
alert("内容不能为空!")
document.getElementById("content").focus();
return false;
}
}
</script>
</head>
<body>
<table width="400" align="center" cellpadding="2"
cellspacing="0">
<tr>
<td colspan="2"><h1> 留言本 </h1></td>
</tr>
<form name="form1" id="form1"
action="<%=basePath%>servlet/MessageServlet" method="post"
onSubmit="javascript: return addCheck()">
<tr>
<th width="70" align="right"> 姓名： </th>
<td width="280" align="left"><input name="name" type="text" class="input2" id="name"></td>
</tr>
<tr>
<th > 主题： </th>
<td><input name="title" type="text" class="input1"></td>
</tr>
<tr>
<th ><span class="STYLE1">留言： </th>
<td ><textarea name="content" id="content" cols="60" rows="5"></textarea></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" name="submit" id="submit" value="提交留言" class="mybutton">
<input type="button" name="submit" id="submit" value="查看留言"
onclick="window.location.href('<%=basePath%>servlet/MessageServlet?action=list&&p=1')" class="mybutton">
<input type="reset" name="reset" id="reset" value="重新填写" class="mybutton">
<input name="action" type="hidden" id="check" value="add"></td>
</tr>
</form>
</table>
</body>
</html>
showMessage.jsp
<%@ page language="java" import="java.util.*,com.demo.Message"
pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>查看留言</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
.line {
border-bottom-width: 1px;
border-bottom-style: dashed;
border-bottom-color: #666;
height: 10px;
}
body {
margin-right: auto;
margin-left: auto;
text-align: center;
max-width: 960px;
}
#main {
border: 3px solid #999;
background-color: #f5f5f5;
padding: 1px;
margin-right: auto;
margin-left: auto;
width: 960px;
}
#main table tr td {
white-space: normal;
}
</style>
</head>
<body>
<div id="main">
<div align="center">
<h1> 留言列表 </h1>
</div>
<%
response.setCharacterEncoding("utf-8");
int p = 1;
ArrayList messageList = (ArrayList) request.getAttribute("list");
int prep = p; // 上一页
int nextp = p; // 下一页
if (messageList.size() == 5) {
nextp = p + 1;
}
if (p > 1) {
prep = p - 1;
}
if (!messageList.isEmpty()) {
for (int i = 0; i < messageList.size(); i++) {
Message message = (Message) messageList.get(i);
%>
<table width="700" border="1" align="center" cellpadding="2"
cellspacing="0">
<tr>
<td width="130" align="right"> 姓名： </td>
<td width="556" align="left"><%=message.getName()%></td>
</tr>
<tr>
<td align="right"> 主题： </td>
<td colspan="3" align="left"><%=message.getTitle()%></td>
</tr>
<tr>
<td align="right"><span class="STYLE1">内容： </td>
<td colspan="3" align="left"><%=message.getContent()%></td>
</tr>
<div> <span style="float: right; clear: both"> <%=message.getTime()%> <span><%=i + 1%>楼 </div>
</table>
<br>
<div class="line"> </div>
<br>
<%
}
} else {
out.print("<br><br>还没有留言!<br><br>");
}
%>
<div align="center">
<input type="button" value="上一页"
onclick="window.location.href('MessageServlet?action=list&p=<%=prep%>')">
<input type="button" value="下一页"
onclick="window.location.href('MessageServlet?action=list&p=<%=nextp%>')">
<input type="button" value="返回"
onclick="window.location.href('../message.jsp')">
</div>
</div>
</body>
</html>
—com.demo包—
Message.java
package com.demo;
/**
* 留言实体封装类
*
*/
public class Message {
private int id;
private String name;
private String title;
private String content;
private String time;
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() { return name;
}
public void setName(String name) {
this.name = name;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
MessageServlet.java
package com.demo;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.demo.Message;
import com.demo.MessageDao;
public class MessageServlet extends HttpServlet {
public void destroy() {
super.destroy();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String action = request.getParameter("action");
if (action.equals("add")) {
this.addMessage(request, response); // 发表留言
}
if (action.equals("list")) { // 前台留言列表
this.listMessage(request, response);
}
}
/**
* 发表留言
*/
public void addMessage(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
String name = request.getParameter("name");
String title = request.getParameter("title");
String content = request.getParameter("content");
Message message = new Message();
message.setName(name);
message.setTitle(title);
message.setContent(content);
MessageDao messageDao = new MessageDao();
messageDao.addMessage(message);
out.print("");
}
/**
*
* @前台查看所有留言
*/
public void listMessage(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
int page = Integer.parseInt(request.getParameter("p"));
MessageDao messageDao = new MessageDao();
List list = null;
list = messageDao.listByPage(page);
request.setAttribute("list", list);
request.getRequestDispatcher("../showMessage.jsp").forward(request,
response);
}
public void init() throws ServletException {
}
}
MessageDao.java
package com.demo;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.demo.DbConnection;
import com.demo.Message;
/**
*
* 留言保存数据库访问类
*
*/
public class MessageDao {
private Connection coon = null;
private PreparedStatement pstmt = null;
private ResultSet rs = null;
private String sql = "";
public MessageDao() {
coon = DbConnection.getConnection();
}
/**
* 保存留言
*/
public void addMessage(Message message) {
System.out.println(message.getName());
coon = DbConnection.getConnection();
sql = "INSERT INTO `message` ( name, title,content,time)VALUES (?,?,?,now())";
try {
pstmt = coon.prepareStatement(sql);
pstmt.setString(1, message.getName());
pstmt.setString(2, message.getTitle());
pstmt.setString(3, message.getContent());
pstmt.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 查询所有留言
*/
public List listByPage(int page) {
int num = 5;// 每页显示的记录数
List list = new ArrayList();
int rowBegin = 0;
int rowEnd = 0;
if (page > 1) {
rowBegin = num * (page - 1);
rowEnd = rowBegin + num;
sql = "select * from message where id limit " + rowBegin + ","
+ rowEnd;
} else {
sql = "select * from message order by id limit 5";
}
try {
pstmt = coon.prepareStatement(sql);
rs = pstmt.executeQuery();
while (rs.next()) {
Message message = new Message();
message.setId(rs.getInt(1));
message.setName(rs.getString(2));
message.setTitle(rs.getString(3));
message.setContent(rs.getString(4));
message.setTime(rs.getDate(5) + " " + rs.getTime(5));
list.add(message);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
}
DbConnection.java
package com.demo;
import java.sql.Connection;
import java.sql.DriverManager;
/**
* 数据库连接类
*
*/
public class DbConnection {
public static Connection getConnection() {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager
.getConnection(
"jdbc:mysql://127.0.0.1:3306/message?useUnicode=true&characterEncoding=utf8",
"**********", "*********"); // **********分别代表数据库用户名，密码
} catch (Exception e) {
e.printStackTrace();
}
if (conn == null) {
System.out.println("no get connection!throws Exception");
}
return conn;
}
}
数据库脚本
-- ---------------------------- -- Table structure for `message` -- ---------------------------- DROP TABLE IF EXISTS `message`; CREATE TABLE `message` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(200) NOT NULL, `title` varchar(200) NOT NULL, `content` varchar(500) NOT NULL, `time` datetime NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=20 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of message -- ----------------------------
原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/10928.html