要求：
完成Java Web项目开发环境的安装：
JDK的安装
Tomcat的安装
MyEclipse的安装(包括MyEclipse用激活工具激活)
在MyEclipse中配置Tomcat、配置Tomcat的JDK、测试MyEclipse中配置的Tomcat是否配置成功
安装mysql的服务器端、安装mysql的图形用户界面
在安装好的图形用户界面中连接mysql服务器并创建一个数据库，在数据库中创建一个user表（包含username、password、status、age、address五个字段，增加五条记录）
创建一个Web Project，基于MVC设计模式，使用JSP/Servlet及JDBC实现读取数据库user表中存放的数据并以表格的形式展示在页面上的功能。
ConnectionFactory.java
1 public class ConnectionFactory {
2 private static Connection conn;
3 public static Connection getConn(){
4 // 加载驱动类
5 try {
6 Class.forName("com.mysql.jdbc.Driver");
7 // 建立与数据库的连接
8 conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/demo?useUnicode=true&" +
9 "characterEncoding=utf-8", "root", "123");
10 } catch (ClassNotFoundException e) {
11 // TODO Auto-generated catch block
12 e.printStackTrace();
13 } catch (SQLException e) {
14 // TODO Auto-generated catch block
15 e.printStackTrace();
16 }
17
18 return conn;
19 }
20 }
User.java
1 public class User {
2 private String username;
3 private String password;
4 private int status;
5 public String getUsername() {
6 return username;
7 }
8 public void setUsername(String username) {
9 this.username = username;
10 }
11 public String getPassword() {
12 return password;
13 }
14 public void setPassword(String password) {
15 this.password = password;
16 }
17 public int getStatus() {
18 return status;
19 }
20 public void setStatus(int status) {
21 this.status = status;
22 }
23
24 }
UserDao.java
1 public class UserDao {
2 public User getUserByName(User user){
3 // 建立连接
4 Connection conn = ConnectionFactory.getConn();
5 String sql="select * from user where username = ?";
6 // 获取预编译语句对象
7 try {
8 PreparedStatement ps = conn.prepareStatement(sql) ;
9 ps.setString(1, user.getUsername());
10 ResultSet rs = ps.executeQuery();
11 while(rs.next()){
12 User result = new User();
13 result.setUsername(rs.getString("username"));
14 result.setPassword(rs.getString("password"));
15 result.setStatus(rs.getInt("status"));
16 return result;
17 }
18 } catch (SQLException e) {
19 // TODO Auto-generated catch block
20 e.printStackTrace();
21 }
22 return null;
23 }
24 }
UserService.java
1 public class UserService {
2 UserDao ud = new UserDao();
3 public int getUserByName(User user){
4 int flag = 0;
5 User result = ud.getUserByName(user);
6 if(result!=null && !"".equals(result)){
7 if(result.getPassword().equals(user.getPassword())){
8 if(result.getStatus()==0){
9 flag = 0;//用户信息正在审核中
10 }else if(result.getStatus()==1){
11 flag = 1;//用户信息审核通过
12 }else if(result.getStatus()==2){
13 flag = 2;//用户信息审核未通过
14 }
15 }else{
16 flag = 3;//用户密码错误
17 }
18 }else{
19 flag = 4;//用户名错误
20 }
21
22
23 return flag;
24 }
25 }
LoginServlet.java
1 public class LoginServlet extends HttpServlet {
2 UserService us = new UserService();
3
4 public void doGet(HttpServletRequest request, HttpServletResponse response)
5 throws ServletException, IOException {
6
7 response.setContentType("text/html");
8 this.doPost(request, response);
9 }
10
11 /**
12 * The doPost method of the servlet. <br>
13 *
14 * This method is called when a form has its tag value method equals to post.
15 *
16 * @param request the request send by the client to the server
17 * @param response the response send by the server to the client
18 * @throws ServletException if an error occurred
19 * @throws IOException if an error occurred
20 */
21 public void doPost(HttpServletRequest request, HttpServletResponse response)
22 throws ServletException, IOException {
23
24 response.setContentType("text/html;charset=utf-8");
25
26 // 处理中文乱码
27 request.setCharacterEncoding("UTF-8");
28 response.setCharacterEncoding("UTF-8");
29
30 // 接受请求
31 String username = request.getParameter("username");
32 String password = request.getParameter("password");
33
34 // 把值封装到对象中
35 User user = new User();
36 user.setUsername(username);
37 user.setPassword(password);
38
39 // 处理请求
40 int result = us.getUserByName(user);
41
42 // 实现跳转
43 if(result == 0){
44 request.setAttribute("msg", "用户信息正在审核中！");
45 request.getRequestDispatcher("login.jsp").forward(request, response);
46 }else if(result == 1){
47 request.setAttribute("msg", "用户登录成功！");
48 request.getRequestDispatcher("main.jsp").forward(request, response);
49 }else if(result == 2){
50 request.setAttribute("msg", "用户信息审核失败！");
51 request.getRequestDispatcher("login.jsp").forward(request, response);
52 }else if(result == 3){
53 request.setAttribute("msg", "用户密码错误！");
54 request.getRequestDispatcher("login.jsp").forward(request, response);
55 }else if(result == 4){
56 request.setAttribute("msg", "用户名错误！");
57 request.getRequestDispatcher("login.jsp").forward(request, response);
58 }
59 }
60
61 }
login.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
2 <%
3 String path = request.getContextPath();
4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
5 %>
6
7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
8 <html>
9 <head>
10 <base href="<%=basePath%>">
11
12 <title>登录页面</title>
13
14 </head>
15
16 <body>
17 <div>提示信息：<%=request.getAttribute("msg") %></div>
18 <form action="loginServlet" method="post">
19 <table>
20 <tr>
21 <td>用户名：</td>
22 <td><input type="text" name="username"/></td>
23 </tr>
24 <tr>
25 <td>密码：</td>
26 <td><input type="password" name="password"/></td>
27 </tr>
28 <tr>
29 <td></td>
30 <td><input type="submit" value="登陆"/></td>
31 </tr>
32 </table>
33
34 </form>
35 </body>
36 </html>
main.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
2 <%
3 String path = request.getContextPath();
4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
5 %>
6
7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
8 <html>
9 <head>
10 <base href="<%=basePath%>">
11
12 <title>登录页面</title>
13
14 </head>
15
16 <body>
17 登录成功！<br/>
18 欢迎<%=request.getParameter("username") %>登录！
19
20 </body>
21 </html>
时间： 2024-11-05 14:58:18