JavaWeb-简易留言板制作【MVC】
Java+Servlet+JSP采用MVC模式（Model+View+Controller）功能：项目的主要模块：注册模块，登陆模块，留言列表模块，留言模块，留言详情模块。注册模块：实现用户注册，将新注册用户数据（用户名和密码）写入数据库，并能识别该用户是否已注册，以及判断注册时密码和确认密码是否一致。登陆模块：实现用户登陆，能够判断该用户是否已注册，用户名密码是否为空以......
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Java+Servlet+JSP
采用MVC模式（Model+View+Controller）
功能：
项目的主要模块：注册模块，登陆模块，留言列表模块，留言模块，留言详情模块。
注册模块：实现用户注册，将新注册用户数据（用户名和密码）写入数据库，并能识别该用户是否已注册，以及判断注册时密码和确认密码是否一致。
登陆模块：实现用户登陆，能够判断该用户是否已注册，用户名密码是否为空以及密码填写是否正确。
留言列表模块：展示是数据库中留言信息（包括留言数，留言标题，留言内容，留言时间以及用户ID），点击留言标题可以跳转到详细的留言页面。
留言模块：留言模块包含留言标题和留言内容，点击提交之后会将数据存在数据库中，并展示于留言列表页面。
留言详情模块：展示某项留言的详细信息，以及展示该留言下的评论。以及评论该留言。
整体框架
View:\登陆界面\注册界面\留言列表界面\留言细节界面（评论）\留言界面
1.login.jsp文件
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>新浪微博</title>
<style type="text/css">
body {
background-color: white;
background-size: 100% 100%;
background-repeat:no-repeat;
background-attachment:fixed
}
html {
height:100%;
weight:100%;
}
label{
color:white;
font-weight:bolder;
}
.center-in-center{
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
-moz-transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
-o-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
.col{
color:white;
font-weight:bolder;
}
</style>
</head>
<body background="pictures/言叶之庭8.png">
<div align="center" class="center-in-center">
<h1 class ="col"> 登陆入口</h1>
<form action="LoginServlet" method = "post">
<input type="hidden" name="action" value="login">
<label>用户名:</label>
<input type="text" name="username" style=width:150px;height:20px; ><br>
<label>密码:</label>
<input type="password" name="password" style=width:150px;height:20px; ><br>
<input type="submit" name="login" value="登陆" style=width:150px;height:20px;><br>
<input type="reset" name="reset" value="重置" style=width:150px;height:20px;><br>
<button type="submit" formaction="register.jsp" style=width:150px;height:20px;>注册</button>
</form>
<p class="col">${message}</p>
</div>
</body>
</html>
2.register.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>新浪微博</title>
<style type="text/css">
body {
background-color: white;
background-size: 100% 100%;
background-repeat:no-repeat;
background-attachment:fixed
}
html {
height:100%;
weight:100%;
}
label{
color:white;
font-weight:bolder;
}
h1{
color:white;
}
.center-in-center{
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
-moz-transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
-o-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
.col{
color:white;
font-weight:bolder;
}
</style>
</head>
<body background="pictures/言叶之庭8.png">
<div align="center" class="center-in-center">
<h1 align="center"> 请完善您的相关信息：</h1>
<form action="RegistServlet" method="post">
<input type="hidden" name="action" value="regist"><br>
<label>用户名:</label>
<input type="text" name="username" required><br>
<label>密码:</label>
<input type="text" name="password" required><br>
<label>确认密码:</label>
<input type="password" name="password2" required>
<p class="col">${message}</p>
<input type="submit" name="regist" value="注册" style=width:75px;>
<input type="reset" value="重置" style=width:75px;>
</form>
</div>
</body>
</html>
3.MessageList.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" import="java.util.*,javaBean.Message"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>留言板系统</title>
<style type="text/css">
body {
background-color: white;
background-size: 100% 100%;
background-repeat:no-repeat;
background-attachment:fixed
}
html {
height:100%;
weight:100%;
}
</style>
</head>
<body background="pictures/言叶之庭4.jpeg">
<div align="center">
<br>
<h1>欢迎来到留言系统</h1>
<table width="800" border="1" cellpadding="5">
<%
ArrayList mL=(ArrayList)request.getAttribute("MessageList");
%>
<tr>
<th>留言数</th>
<th>标题</th>
<th>留言内容</th>
<th>用户ID</th>
</tr>
<% if (mL != null){
for (int i = 0; i < mL.size(); ++i ){
Message message = (Message)mL.get(i);%>
<tr>
<td><%= message.getmid() %></td>
<td><a href="MessageDetail.jsp?mid=<%= message.getmid() %>"><%= message.gettitle() %></td>
<td><%= message.getcontext() %></td>
<td><%= message.getuserid() %></td>
</tr>
<% } } %>
</table>
<h2><a href="LeaveMessage.jsp">我要留言</a> </h2>
</div>
</body>
</html>
4.LeaveMessage.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>新浪微博</title>
<style type="text/css">
body {
background-color: white;
background-size: 100% 100%;
background-repeat:no-repeat;
background-attachment:fixed
}
html {
height:100%;
weight:100%;
}
.center-in-center{
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
-moz-transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
-o-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
</style>
</head>
<body background="pictures/言叶之庭4.jpeg">
<div align="center" class="center-in-center">
<form action="LeaveMessageServlet" method="post">
<input type="hidden" name="action" value="leave">
<p>标题</p>
<textarea name="title" rows="1" cols="60" required></textarea>
<p>留言</p>
<textarea name="context" cols="60" rows="8" required></textarea><br>
<input type="submit" value="提交">
</form>
</div>
</body>
</html>
5.MessageDetail.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" import="java.util.*,javaBean.*,useBean.*"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>新浪微博</title>
<style type="text/css">
body {
background-color: white;
background-size: 100% 100%;
background-repeat:no-repeat;
background-attachment:fixed
}
html {
height:100%;
weight:100%;
}
</style>
</head>
<body background="pictures/言叶之庭4.jpeg">
<%
String mid ="";
mid= request.getParameter("mid");
Message message = new Message();
message = MessageDB.selectMessagem(mid);
%>
<h1>主题：<%= message.gettitle() %></h1>
<h2>内容：</h2>
<p><%= message.getcontext() %></p>
<h3>评论：</h3>
<p>=================================================================================</p>
<%
ArrayList mL=(ArrayList)request.getAttribute("DetailList");
%>
<% if (mL != null){
for (int i = 0; i < mL.size(); ++i ){
Detail detail = (Detail)mL.get(i);
if(detail.getmid().equals(mid)){
%>
<p>用户:
<%= detail.getcuser() %></p>
<p>评论：
<%= detail.getcomment() %></p>
<p>时间:
<%= detail.getctime() %></p>
<p>=================================================================================</p>
<%} }} %>
<form action="LeaveDetailServlet" method="post">
<input type="hidden" name="action" value="leave">
<p>提交留言，查看评论：</p>
<textarea name="comment" cols="60" rows="4" required></textarea><br>
<input type="hidden" name="mid" value="<%= mid %>">
<input type="submit" value="卑微评论.">
</form>
</body>
</html>
Model:
UserBean:\User.java\Message.java\Detail.java
UseBean:\UserDB.java\MessageDB.java\DetailDB.java
ConnectionPool:\ConnectionPool.java\DBUtil.java
JDBC:\JDBC.java
1.User.java
package javaBean;
import java.io.*;
public class User implements Serializable{
private String id;
private String username;
private String password;
public User() {
id ="";
username = "";
password = "";
}
public User(String username,String password) {
this.username =username;
this.password = password;
}
public String getid() {
return id;
}
public void setid(String id) {
this.id = id;
}
public String getusername() {
return username;
}
public void setusername(String username) {
this.username = username;
}
public String getpassword() {
return password;
}
public void setpassword(String password) {
this.password = password;
}
}
2.Message.java
package javaBean;
import java.io.Serializable;
public class Message implements Serializable{
private String mid;
private String userid;
private String title;
private String context;
public Message() {
mid ="";
userid="";
title = "";
context = "";
}
public Message(String userid,String title,String context) {
this.userid=userid;
this.title =title;
this.context = context;
}
public String getmid() {
return mid;
}
public String gettitle() {
return title;
}
public String getuserid() {
return userid;
}
public String getcontext() {
return context;
}
public void setuserid(String userid) {
this.userid = userid;
}
public void settitle(String title) {
this.title = title;
}
public void setmid(String mid) {
this.mid = mid;
}
public void setcontext(String context) {
this.context = context;
}
}
3.Detail.java
package javaBean;
import java.io.Serializable;
import java.sql.Date;
public class Detail implements Serializable{
private String cid;
private String mid;
private String cuser;
private String comment;
private Date ctime;
public Detail() {
cid ="";
cuser="";
comment = "";
}
public Detail(String cuser, String mid, String comment,Date ctime) {
this.cuser=cuser;
this.mid= mid;
this.comment =comment;
this.ctime = ctime;
}
public String getcid() {
return cid;
}
public String getmid() {
return mid;
}
public String getcomment() {
return comment;
}
public String getcuser() {
return cuser;
}
public Date getctime() {
return ctime;
}
public void setcid(String cid) {
this.cid = cid;
}
public void setmid(String mid) {
this.mid = mid;
}
public void setcomment(String comment) {
this.comment = comment;
}
public void setcuser(String cuser) {
this.cuser = cuser;
}
public void setctime(Date ctime) {
this.ctime = ctime;
}
}
4.UserDB.java
package useBean;
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 connectionPool.ConnectionPool;
import connectionPool.DBUtil;
import javaBean.Message;
import javaBean.User;
public class UserDB {
//插入用户
public static int insert(User user) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
String query = "INSERT INTO User (username, password)"
+"VALUES (?, ?)";
try {
ps = connection.prepareStatement(query);
ps.setString(1, user.getusername());
ps.setString(2, user.getpassword());
return ps.executeUpdate();
} catch (SQLException e) {
System.out.println(e);
return 0;
} finally {
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
//判断用户名是否存在
public static boolean UserExists(String username) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT username FROM User "
+ "WHERE username = ?";
try {
ps = connection.prepareStatement(query);
ps.setString(1, username);
rs = ps.executeQuery();
return rs.next();
} catch (SQLException e) {
System.out.println(e);
return false;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
//根据username读出user
public static User selectUser(String username) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM User "
+ "WHERE username = ?";
try {
ps = connection.prepareStatement(query);
ps.setString(1, username);
rs = ps.executeQuery();
User user = null;
if (rs.next()) {
user = new User ();
user.setid(rs.getString("id"));
user.setusername(rs.getString("username"));
user.setpassword(rs.getString("password"));
}
return user;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
//根据userid读出user
public static User selectUser1(String id) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM User "
+ "WHERE id = ?";
try {
ps = connection.prepareStatement(query);
ps.setString(1, id);
rs = ps.executeQuery();
User user = null;
if (rs.next()) {
user = new User ();
user.setid(rs.getString("id"));
user.setusername(rs.getString("username"));
user.setpassword(rs.getString("password"));
}
return user;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
//从message表中读出所有数据
public static List<Message> selectU() {
List<Message> mL= new ArrayList<Message>();
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM Message ";
try {
ps = connection.prepareStatement(query);
rs = ps.executeQuery();
Message m = null;
while (rs.next()) {
m = new Message ();
m.setcontext(rs.getString("context"));
m.setmid(rs.getString("mid"));
m.settitle(rs.getString("title"));
m.setuserid(rs.getString("userid"));
mL.add(m);
}
return mL;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
}
5.MessageDB.java
package useBean;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import connectionPool.ConnectionPool;
import connectionPool.DBUtil;
import javaBean.Message;
public class MessageDB {
public static int insert(Message message) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
String query = "INSERT INTO Message (userid, title, context)"
+"VALUES (?, ?, ?)";
try {
ps = connection.prepareStatement(query);
ps.setString(1, message.getuserid());
ps.setString(2, message.gettitle());
ps.setString(3, message.getcontext());
return ps.executeUpdate();
} catch (SQLException e) {
System.out.println(e);
return 0;
} finally {
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
public static Message selectMessage(String userid) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM Message "
+ "WHERE userid = ?";
try {
ps = connection.prepareStatement(query);
ps.setString(1, userid);
rs = ps.executeQuery();
Message message = null;
if (rs.next()) {
message = new Message ();
message.setmid(rs.getString("mid"));
message.setuserid(rs.getString("userid"));
message.settitle(rs.getString("title"));
message.setcontext(rs.getString("context"));
}
return message;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
public static Message selectMessagem(String mid) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM Message "
+ "WHERE mid = ?";
try {
ps = connection.prepareStatement(query);
ps.setString(1, mid);
rs = ps.executeQuery();
Message message = null;
if (rs.next()) {
message = new Message ();
message.setmid(rs.getString("mid"));
message.setuserid(rs.getString("userid"));
message.settitle(rs.getString("title"));
message.setcontext(rs.getString("context"));
}
return message;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
}
6.DetailDB.java
package useBean;
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 connectionPool.ConnectionPool;
import connectionPool.DBUtil;
import javaBean.Detail;
public class DetailDB {
public static int insert(Detail detail) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
String query = "INSERT INTO Detail (mid, cuser, comment, ctime)"
+"VALUES (?, ?, ?, ?)";
try {
ps = connection.prepareStatement(query);
ps.setString(1, detail.getmid());
ps.setString(2, detail.getcuser());
ps.setString(3, detail.getcomment());
ps.setDate(4, detail.getctime());
return ps.executeUpdate();
} catch (SQLException e) {
System.out.println(e);
return 0;
} finally {
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
public static Detail selectDetail(String userid) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM Detail "
+ "WHERE userid = ?";
try {
ps = connection.prepareStatement(query);
ps.setString(1, userid);
rs = ps.executeQuery();
Detail detail = null;
if (rs.next()) {
detail = new Detail();
detail.setmid(rs.getString("mid"));
detail.setcuser(rs.getString("cuser"));
detail.setcomment(rs.getString("comment"));
detail.setctime(rs.getDate("ctime"));
}
return detail;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
public static List<Detail> selectU() {
List<Detail> mL= new ArrayList<Detail>();
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String query = "SELECT * FROM detail";
try {
ps = connection.prepareStatement(query);
rs = ps.executeQuery();
Detail m = null;
while (rs.next()) {
m = new Detail ();
m.setcid(rs.getString("cid"));
m.setmid(rs.getString("mid"));
m.setcuser(rs.getString("cuser"));
m.setcomment(rs.getString("comment"));
m.setctime(rs.getDate("ctime"));
mL.add(m);
}
return mL;
} catch (SQLException e) {
System.out.println(e);
return null;
} finally {
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(ps);
pool.freeConnection(connection);
}
}
}
7.ConnectionPool.java
package connectionPool;
import java.sql.*;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class ConnectionPool {
private static ConnectionPool pool = null;
private static DataSource dataSource = null;
private ConnectionPool() {
try {
InitialContext ic = new InitialContext();
dataSource = (DataSource) ic.lookup("java:/comp/env/jdbc/123");
} catch (NamingException e) {
System.out.println(e);
}
}
public static synchronized ConnectionPool getInstance() {
if (pool == null) {
pool = new ConnectionPool();
}
return pool;
}
public Connection getConnection() {
try {
return dataSource.getConnection();
} catch (SQLException e) {
System.out.println(e);
return null;
}
}
public void freeConnection(Connection c) {
try {
c.close();
} catch (SQLException e) {
System.out.println(e);
}
}
}
8.DBUtil.java
package connectionPool;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBUtil {
public static void closeStatement(Statement s) {
try {
if (s != null) {
s.close();
}
} catch (SQLException e) {
System.out.println(e);
}
}
public static void closePreparedStatement(Statement ps) {
try {
if (ps != null) {
ps. close();
}
} catch (SQLException e) {
System.out.println(e);
}
}
public static void closeResultSet(ResultSet rs) {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
System.out.println(e);
}
}
}
9.JDBC.java
package JDBC;
import java.sql.*;
public class JDBC {
public static void main(String args[]) {
try {
Class.forName("com.mysql.cj.jdbc.Driver"); //加载MYSQL JDBC驱动程序
//Class.forName("org.gjt.mm.mysql.Driver");
System.out.println("Success loading Mysql Driver!");
}
catch (Exception e) {
System.out.print("Error loading Mysql Driver!");
e.printStackTrace();
}
try {
Connection connect = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/messageboard?serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&useSSL=false","用户名","密码");
//连接URL为 jdbc:mysql//服务器地址/数据库名 ，后面的2个参数分别是登陆用户名和密码
System.out.println("Success connect Mysql server!");
Statement stmt = connect.createStatement();
ResultSet rs = stmt.executeQuery("select * from 表名"); //！！！表名
while (rs.next()) {
System.out.print(rs.getString(1));
System.out.print(rs.getString(2));
System.out.println(rs.getString(3));
}
}
catch (Exception e) {
System.out.print("get data error!");
e.printStackTrace();
}
}
}
10.context.xml(与JDBC对应)
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/MessageBoard">
<!-- context里的path要填映像值 resource里的name要填connection的lookup的值
url后面要指定时区 -->
<Resource name="jdbc/123" auth="Container"
driverClassName="com.mysql.jdbc.Driver"
url = "jdbc:mysql://localhost:3306/messageboard?serverTimezone=UTC"
username="root" password="123"
maxActive="100" maxidle="30" maxWait="10000"
logAbandoned="true" removeAbandoned="true"
removeAbandonedTimeout="60" type="javax.sql.DataSource" />
</Context> Controller:
\LoginServlet.java\RegistServlet.java\\LeaveMessageServlet.java
\LeaveDetailServlet.java
1.LoginServlet.java
package Sevlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javaBean.Message;
import javaBean.User;
import useBean.MessageDB;
import useBean.UserDB;
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
String message="";
public LoginServlet() {
super();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String url ="/login.jsp";
String action = request.getParameter("action");
request.setCharacterEncoding("utf-8");
//检测页面是否提交
if(action == null)
url="/login.jsp";
else if(action.equals("login"))
url = login(request,response);
request.setAttribute("message", message);
getServletContext().getRequestDispatcher(url).forward(request, response);
}
@SuppressWarnings("unused")
private String login(HttpServletRequest request, HttpServletResponse response) {
String username = request.getParameter("username");
String password = request.getParameter("password");
HttpSession session = request.getSession();
String userid="";
User user = UserDB.selectUser(username);
String url = "/register.jsp";
if(user != null) {
if(user.getpassword().equals(password)) {
Cookie u = new Cookie("userid",username);
u.setMaxAge(60*60*24*365*2);
u.setPath("/");
response.addCookie(u);
userid = user.getid();
session.setAttribute("userid", userid);
List<Message> mL = UserDB.selectU();
request.setAttribute("MessageList", mL);
url="/MessageList.jsp";
}
else {
message = "密码错误";
url="/login.jsp";
}
}
else {
message = "该用户不存在";
url = "/login.jsp";
}
return url;
}
}
2.RegistServlet.java
package Sevlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javaBean.User;
import useBean.UserDB;
@WebServlet("/RegistServlet")
public class RegistServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
String message ="";
public RegistServlet() {
super();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String action = request.getParameter("action");
String url ="register.html";
if(action.equals("regist"))
url = registerUser(request,response);
getServletContext().getRequestDispatcher(url).forward(request, response);
}
private String registerUser(HttpServletRequest request,HttpServletResponse response) {
String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
String message = "";
HttpSession session = request.getSession();
//将数据存储于User对象
User user = new User();
user.setusername (username);
user.setpassword(password);
String url = "/login.jsp";
if(password.equals(password2))
{
if( !UserDB.UserExists(username) ) {
message = "注册成功！";
session.setAttribute("message", message);
UserDB.insert(user);
return url;
}
else
{
message = "用户名已存在";
url = "/register.jsp";
session.setAttribute("message", message);
return url;
}
}
else
{
message = "密码不一致";
session.setAttribute("message", message);
url = "/register.jsp";
return url;
}
}
}
3.LeaveMessageServlet.java
package Sevlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javaBean.Message;
import useBean.MessageDB;
import useBean.UserDB;
@WebServlet("/LeaveMessageServlet")
public class LeaveMessageServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LeaveMessageServlet() {
super();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String action = request.getParameter("action");
String url ="/LeaveMessage.jsp";
if(action.equals("leave"))
url = leaveMessage(request,response);
getServletContext().getRequestDispatcher(url).forward(request, response);
}
private String leaveMessage(HttpServletRequest request,HttpServletResponse response) {
String title = request.getParameter("title");
String context = request.getParameter("context");
String userid="";
String url="";
HttpSession session = request.getSession();
//将数据存储于Message对象
Message message = new Message();
message.setuserid((String)session.getAttribute("userid"));
message.settitle (title);
message.setcontext(context);
MessageDB.insert(message);
Message messagess = MessageDB.selectMessage(userid);
List<Message> mL = UserDB.selectU();
request.setAttribute("MessageList", mL);
url="/MessageList.jsp";
return url;
}
}
4.LeaveDetailServlet.java
package Sevlet;
import java.io.IOException;
import java.sql.Date;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javaBean.Detail;
import javaBean.Message;
import javaBean.User;
import useBean.DetailDB;
import useBean.MessageDB;
import useBean.UserDB;
@WebServlet("/LeaveDetailServlet")
public class LeaveDetailServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LeaveDetailServlet() {
super();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String action = request.getParameter("action");
String url ="/MessageDetail.jsp";
if(action.equals("leave"))
url = leaveDetail(request,response);
getServletContext().getRequestDispatcher(url).forward(request, response);
}
private String leaveDetail(HttpServletRequest request,HttpServletResponse response) {
String comment = request.getParameter("comment");
String mid = request.getParameter("mid");
HttpSession session = request.getSession();
String userid="";
String url="";
String cuser="";
//将数据存储于Detail对象
Detail detail = new Detail();
userid = (String)session.getAttribute("userid");
User user = UserDB.selectUser1(userid);
cuser = user.getusername();
detail.setmid(mid);
detail.setcuser(cuser);
detail.setcomment(comment);
detail.setctime(new Date(System.currentTimeMillis()));
DetailDB.insert(detail);
List<Detail> mL = DetailDB.selectU();
request.setAttribute("DetailList", mL);
url="/MessageDetail.jsp?mid="+mid;
return url;
}
}
数据库结构
部分功能展示
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2020-12-19
留言板源码
链接：https://pan.baidu.com/s/1-ukIjRPInwRRFdDVRss7Sw
提取码：e2ih
eclipse-ee(这个是for web开发者的)
链接：https://pan.baidu.com/s/1o9GkyYzMMuU6koWw5PzZ2w
提取码：s6g4
tomcat
链接：https://pan.baidu.com/s/1jfMHL351VXOF0LxD9ClrKg
提取码：wqv2
===========================================分割线===========================================
源码要修改自己的数据库
设计数据库的时候id要递增
如何配置请百度
2020-12-19（我还是当初那个菜鸡）
===========================================分割线===========================================
先自己配置一下，不会的百度！百度！
勾选自动递增！
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