软件工程概论第一课

时间：2017-11-22 21:53:34 阅读：177 评论：0 收藏：0 [点我收藏+]

标签：jdb == org 源代码 gen tty 名称 interface win

一.网站系统开发需要掌握的技术

1.javaweb

2.HTML

3.CSS

二.课堂测试的源代码

 1 package com.jaovo.msg.dao;
 2 
 3 
 4 import com.jaovo.msg.model.User;
 5 
 6 public interface IUserDao {
 7     
 8     public void login(User user);
 9     public void register(User user);
10     
11     
12 }

 1 package com.jaovo.msg.dao;
 2 
 3 import java.sql.Connection;
 4 import java.sql.PreparedStatement;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 
 8 
 9 import com.jaovo.msg.Util.DBUtil;
10 import com.jaovo.msg.Util.UserException;
11 import com.jaovo.msg.model.User;
12 
13 
14 
15 public class UserDaoImpl implements IUserDao {
16 
17     public void login(User user) {
18         
19         Connection connection = DBUtil.getConnection();
20         String sql = "select count(*) from t_login where username=? And password = ?";
21         PreparedStatement preparedStatement = null;
22         ResultSet resultSet = null;
23         
24         try {
25             preparedStatement = connection.prepareStatement(sql);
26             preparedStatement.setString(1, user.getUsername());
27             preparedStatement.setString(2, user.getPassword());
28             System.out.println("当前的文本框中的姓名为:"+user.getUsername());
29             System.out.println("当前的文本框中的密码为:"+user.getPassword());
30             resultSet = preparedStatement.executeQuery();
31             
32             while(resultSet.next()) {
33                 
34                 if (resultSet.getInt(1) > 0) 
35                 {
36                     return;
37                 }
38                 else
39                 {
40                     throw new UserException("用户不存在!") ;
41                 }
42                 
43                 
44             }
45             
46             
47             
48         } catch (SQLException e) {
49             e.printStackTrace();
50         }finally {
51             DBUtil.close(resultSet);
52             DBUtil.close(preparedStatement);
53             DBUtil.close(connection);
54         }
55         
56     }
57 
58     public void register(User user) {
59         Connection connection = DBUtil.getConnection();
60         String sql = "select count(*) from t_login where username = ?";
61         PreparedStatement preparedStatement = null;
62         ResultSet resultSet = null;
63         
64         try {
65             preparedStatement = connection.prepareStatement(sql);
66             preparedStatement.setString(1, user.getUsername());
67             resultSet = preparedStatement.executeQuery();
68             
69             
70             while(resultSet.next()) {
71                 
72                 if (resultSet.getInt(1) > 0) 
73                 {
74                     throw new UserException("用户已存在!") ;
75                 }
76                 
77             }
78             
79             sql = "insert into t_login(username,password) values(?,?)";
80             preparedStatement = connection.prepareStatement(sql);
81             
82             preparedStatement.setString(1,user.getUsername());
83             preparedStatement.setString(2,user.getPassword());
84             
85             preparedStatement.executeUpdate();
86             
87         } catch (SQLException e) {
88             e.printStackTrace();
89         }finally {
90             DBUtil.close(resultSet);
91             DBUtil.close(preparedStatement);
92             DBUtil.close(connection);
93         }
94         
95     }
96 
97 
98 
99 }

 1 package com.jaovo.msg.model;
 2 
 3 public class User {
 4     
 5     private int id;
 6     private String  username;
 7     private String  password;
 8     public int getId() {
 9         return id;
10     }
11     public void setId(int id) {
12         this.id = id;
13     }
14     public String getUsername() {
15         return username;
16     }
17     public void setUsername(String username) {
18         this.username = username;
19     }
20     
21     public String getPassword() {
22         return password;
23     }
24     public void setPassword(String password) {
25         this.password = password;
26     }
27     
28 }

 1 package com.jaovo.msg.Util;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.PreparedStatement;
 6 import java.sql.ResultSet;
 7 import java.sql.SQLException;
 8 
 9 public class DBUtil {
10     
11     public  static  Connection getConnection() {
12         try {
13             
14             Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
15             
16         } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
17             // TODO Auto-generated catch block
18             e.printStackTrace();
19         }
20         String user = "sa";
21         String password = "jisuan@10Q";
22         String url = "jdbc:sqlserver://localhost:1433;DatabaseName=hoghouse";
23         Connection connection = null;
24         try {
25             connection = DriverManager.getConnection(url,user,password);
26             
27         } catch (SQLException e) {
28             
29             e.printStackTrace();
30         }
31         return connection;
32     }
33     
34     
35     public static void close(Connection connection ) {
36         try {
37             if (connection != null) {
38                 connection.close();
39             }
40             
41         } catch (SQLException e) {
42             // TODO Auto-generated catch block
43             e.printStackTrace();
44         }
45     }
46     public static void close(PreparedStatement preparedStatement ) {
47         try {
48             if (preparedStatement != null) {
49                 preparedStatement.close();
50             }
51             
52         } catch (SQLException e) {
53             // TODO Auto-generated catch block
54             e.printStackTrace();
55         }
56     }
57     public static void close(ResultSet resultSet ) {
58         try {
59             if (resultSet != null) {
60                 resultSet.close();
61             }
62             
63         } catch (SQLException e) {
64             // TODO Auto-generated catch block
65             e.printStackTrace();
66         }
67     }
68     
69 }

 1 package com.jaovo.msg.Util;
 2 
 3 public class UserException extends RuntimeException{
 4 
 5     /**
 6      * 
 7      */
 8     private static final long serialVersionUID = 1L;
 9 
10     public UserException() {
11         super();
12         // TODO Auto-generated constructor stub
13     }
14 
15 
16     public UserException(String message) {
17         super(message);
18         // TODO Auto-generated constructor stub
19     }
20 
21     
22 }

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6     <title>用户登录页面</title>
 7 </head>
 8 <body>
 9     <%=request.getAttribute("error") %>
10     <form action="back-login.jsp" method="get">
11         <table align="center" border="1" width="500">
12             <tr>
13                 <td>用户名称 : </td>
14                 <td>
15                     <input type="text" name="username" />
16                 </td>
17             </tr>
18             <tr>
19                 <td>用户密码:</td>
20                 <td>
21                     <input type="password" name="password" />
22                 </td>
23             </tr>
24             <tr align="center">
25                 <td colspan="2">
26                     <input type="submit" value="登录" />
27                 </td>
28                 <td colspan="2">
29                     <a href="front-register.jsp">注册</a>
30                 </td>
31             </tr>
32         </table>
33     </form>
34 </body>
35 </html>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6     <title>用户注册页面</title>
 7 </head>
 8 <body>
 9     <%=request.getAttribute("error") %>
10     <form action="back-register.jsp" method="get">
11         <table align="center" border="1" width="500">
12             <tr>
13                 <td>用户名称 : </td>
14                 <td>
15                     <input type="text" name="username" />
16                 </td>
17             </tr>
18             <tr>
19                 <td>用户密码:</td>
20                 <td>
21                     <input type="password" name="password" />
22                 </td>
23             </tr>
24             <tr align="center">
25                 <td colspan="2">
26                     <input type="submit" value="注册" />
27                     <input type="reset" value="重置" />
28                 </td>
29             </tr>
30         </table>
31     </form>
32 </body>
33 </html>

 1 <%@page import="com.jaovo.msg.Util.UserException"%>
 2 <%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
 3 <%@page import="com.jaovo.msg.model.User"%>
 4 <%@ page language="java" contentType="text/html; charset=UTF-8"
 5     pageEncoding="UTF-8"%>
 6 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 7 <html>
 8 <%
 9     //接收客户端传递过来的参数
10     String username = request.getParameter("username");
11     String password = request.getParameter("password");
12     if(username == null || "".equals(username.trim())){
13         request.setAttribute("error", "用户名不能为空");
14 %>
15     <jsp:forward page="front-login.jsp"></jsp:forward>
16 <%
17     }
18     User user = new User();
19     user.setUsername(username);
20     user.setPassword(password);
21     
22     UserDaoImpl userDao = new UserDaoImpl();
23     try{
24     userDao.login(user);
25 %>
26     用户登录成功!!<br>
27     <a href="#">网站界面</a>
28 <%
29     }catch(UserException e){
30 %>
31     <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
32     <%
33     }
34     %>
35 </html>

 1 <%@page import="com.jaovo.msg.Util.UserException"%>
 2 <%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
 3 <%@page import="com.jaovo.msg.model.User"%>
 4 <%@ page language="java" contentType="text/html; charset=UTF-8"
 5     pageEncoding="UTF-8"%>
 6 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 7 <html>
 8 <%
 9     //接收客户端传递过来的参数
10     String username = request.getParameter("username");
11     String password = request.getParameter("password");
12     if(username == null || "".equals(username.trim())){
13         request.setAttribute("error", "用户名不能为空");
14 %>
15     <jsp:forward page="front-register.jsp"></jsp:forward>
16 <%
17     }
18     User user = new User();
19     user.setUsername(username);
20     user.setPassword(password);
21     
22     UserDaoImpl userDao = new UserDaoImpl();
23     try{
24     userDao.register(user);
25 %>
26     用户注册成功!!<br>
27     <a href="front-login.jsp">登录</a>      
28 <%
29     }catch(UserException e){
30 %>
31     <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
32     <%
33     }
34     %>
35 </html>