软件工程概论课堂测试一（设计添加新课程界面）
Posted 年少如诗
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设计思想：首先实现界面功能，（包含三个输入框分别是课程名称，老师，上课地点），再添加一个保存按钮。之后建立与数据的连接，将信息保存在数据库中的表中
。之后定义异常处理机制，如果输入与要求不符抛出相应的异常信息，并输出。
源代码：
1 package com.jaovo.msg.dao; 2 import java.sql.Connection; 3 import java.sql.PreparedStatement; 4 import java.sql.ResultSet; 5 import java.sql.SQLException; 6 import java.util.List; 7 import java.util.ArrayList; 8 9 10 import com.jaovo.msg.Util.DBUtil; 11 import com.jaovo.msg.model.User; 12 import com.jaovo.msg.Util.UserException; 13 14 15 public class UserDaoImpl implements IUserDao{ 16 17 @Override 18 public void add(User user) { 19 // TODO Auto-generated method stub 20 Connection connection = DBUtil.getConnection(); 21 22 String sql = "select count(*) from t_user where username = ?"; 23 24 PreparedStatement preparedStatement = null; 25 ResultSet resultSet = null; 26 try { 27 preparedStatement = connection.prepareStatement(sql); 28 preparedStatement.setString(1, user.getUsername()); 29 30 resultSet = preparedStatement.executeQuery(); 31 32 // while(resultSet.next()) { 33 // if (resultSet.getInt(1) > 0) { 34 // throw new UserException("课程已存在") ; 35 // } 36 // } 37 // 38 sql = "insert into t_user(username,password,nickname) value (?,?,?)"; 39 preparedStatement = (PreparedStatement) connection.prepareStatement(sql); 40 preparedStatement.setString(1, user.getUsername()); 41 preparedStatement.setString(2, user.getPassword()); 42 preparedStatement.setString(3, user.getNickname()); 43 preparedStatement.executeUpdate(); 44 } catch (SQLException e) { 45 // TODO Auto-generated catch block 46 e.printStackTrace(); 47 }finally { 48 49 DBUtil.close(resultSet); 50 DBUtil.close(preparedStatement); 51 DBUtil.close(connection); 52 } 53 54 } 55 56 57 @Override 58 public void delete(int id) { 59 // TODO Auto-generated method stub 60 61 Connection connection = DBUtil.getConnection(); 62 String sql = "delete from t_user where id = ?"; 63 PreparedStatement preparedStatement = null; 64 65 try { 66 preparedStatement = connection.prepareStatement(sql); 67 preparedStatement.setInt(1, id); 68 preparedStatement.executeUpdate(); 69 } catch (SQLException e) { 70 // TODO Auto-generated catch block 71 e.printStackTrace(); 72 }finally { 73 DBUtil.close(preparedStatement); 74 DBUtil.close(connection); 75 } 76 77 } 78 79 @Override 80 public void update(User user) { 81 Connection connection = DBUtil.getConnection(); 82 83 String sql = "update t_user set password = ? , nickname=? where id = ?"; 84 85 PreparedStatement preparedStatement = null; 86 try { 87 preparedStatement = connection.prepareStatement(sql); 88 preparedStatement.setString(1, user.getPassword()); 89 preparedStatement.setString(2, user.getNickname()); 90 preparedStatement.setInt(3, user.getId()); 91 preparedStatement.executeUpdate(); 92 } catch (SQLException e) { 93 // TODO Auto-generated catch block 94 e.printStackTrace(); 95 }finally { 96 DBUtil.close(preparedStatement); 97 DBUtil.close(connection); 98 } 99 } 100 101 102 103 104 @Override 105 public User load(int id) { 106 Connection connection = DBUtil.getConnection(); 107 108 String sql = "select * from t_user where id = ?"; 109 110 PreparedStatement preparedStatement = null; 111 ResultSet resultSet = null; 112 User user = null; 113 try { 114 preparedStatement = (PreparedStatement) connection.prepareStatement(sql); 115 preparedStatement.setInt(1, id); 116 resultSet = preparedStatement.executeQuery(); 117 while(resultSet.next()) { 118 user = new User(); 119 user.setId(id); 120 user.setUsername(resultSet.getString("username")); 121 user.setPassword(resultSet.getString("password")); 122 user.setNickname(resultSet.getString("nickname")); 123 } 124 } catch (SQLException e) { 125 // TODO Auto-generated catch block 126 e.printStackTrace(); 127 }finally { 128 DBUtil.close(resultSet); 129 DBUtil.close(preparedStatement); 130 DBUtil.close(connection); 131 } 132 return user; 133 } 134 135 136 @Override 137 public User load(String username) { 138 // TODO Auto-generated method stub 139 return null; 140 } 141 142 @Override 143 public List<User> load() { 144 Connection connection = DBUtil.getConnection(); 145 146 String sql = "select * from t_user "; 147 148 PreparedStatement preparedStatement = null; 149 ResultSet resultSet = null; 150 151 List<User> users = new ArrayList<User>(); 152 User user = null; 153 try { 154 preparedStatement = connection.prepareStatement(sql); 155 resultSet = preparedStatement.executeQuery(); 156 while(resultSet.next()) { 157 user = new User(); 158 user.setId(resultSet.getInt("id")); 159 user.setUsername(resultSet.getString("username")); 160 user.setPassword(resultSet.getString("password")); 161 user.setNickname(resultSet.getString("nickname")); 162 users.add(user); 163 } 164 } catch (SQLException e) { 165 // TODO Auto-generated catch block 166 e.printStackTrace(); 167 }finally { 168 DBUtil.close(resultSet); 169 DBUtil.close(preparedStatement); 170 DBUtil.close(connection); 171 } 172 return users; 173 } 174 175 }
1 package com.jaovo.msg.model; 2 3 public class User { 4 private int id; 5 private String username; 6 private String nickname; 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 public String getNickname() { 21 return nickname; 22 } 23 public void setNickname(String nickname) { 24 this.nickname = nickname; 25 } 26 public String getPassword() { 27 return password; 28 } 29 public void setPassword(String password) { 30 this.password = password; 31 } 32 33 34 }
1 package com.jaovo.msg.Util; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.ResultSet; 6 import java.sql.SQLException; 7 8 import java.sql.PreparedStatement; 9 10 public class DBUtil { 11 public static Connection getConnection() { 12 13 try { 14 15 Class.forName("com.mysql.jdbc.Driver").newInstance(); 16 } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { 17 // TODO Auto-generated catch block 18 e.printStackTrace(); 19 } 20 String user = "root"; 21 String password = "root"; 22 String url = "jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=UTF-8"; 23 Connection connection = null; 24 try { 25 26 connection = DriverManager.getConnection(url,user,password); 27 } catch (SQLException e) { 28 // TODO Auto-generated catch block 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 70 71 72 }
1 package com.jaovo.msg.Util; 2 3 public class UserException extends Exception{ 4 5 public UserException() { 6 super(); 7 // TODO Auto-generated constructor stub 8 } 9 10 public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) { 11 super(message, cause, enableSuppression, writableStackTrace); 12 // TODO Auto-generated constructor stub 13 } 14 15 public UserException(String message, Throwable cause) { 16 super(message, cause); 17 // TODO Auto-generated constructor stub 18 } 19 20 public UserException(String message) { 21 super(message); 22 // TODO Auto-generated constructor stub 23 } 24 25 public UserException(Throwable cause) { 26 super(cause); 27 // TODO Auto-generated constructor stub 28 } 29 30 31 32 33 34 }
1 package com.jaovo.msg.Util; 2 3 public class UserException1 extends Exception{ 4 5 public UserException1() { 6 super(); 7 // TODO Auto-generated constructor stub 8 } 9 10 11 12 public UserException1(String message) { 13 super(message); 14 // TODO Auto-generated constructor stub 15 } 16 17 18 19 }
1 -- mysal -u root -p root; 2 -- show databases; 3 -- drop database jaovo_shop; 4 5 create database jaovo_msg; 6 use jaovo_msg; 7 GRANT ALL ON jaovo_msg.* to "jaovo"@"localhost" IDENTIFIED BY "root"; 8 create table t_user( 9 id int(10) primary key auto_increment, 10 username varchar(255), 11 password varchar(255), 12 nickname varchar(255), 13 type int(2), 14 status int(2) 15 ); 16 17 create table t_message( 18 id int(10) primary key auto_increment, 19 title varchar(254), 20 content text, 21 post_date datetime, 22 user_id int(10), 23 CONSTRAINT FOREIGN KEY(user_id) REFERENCES t_user(id) 24 ); 25 26 create table t_comment( 27 id int(10) primary key auto_increment, 28 content text, 29 post_date datetime, 30 user_id int(10), 31 msg_id int(10), 32 CONSTRAINT FOREIGN KEY(user_id) REFERENCES t_user(id), 33 CONSTRAINT FOREIGN KEY(msg_id) REFERENCES t_message(id) 34 );
1 <%@page import="com.jaovo.msg.Util.UserException"%> 2 <%@page import="com.jaovo.msg.dao.UserDaoImpl"%> 3 <%@page import="com.jaovo.msg.Util.UserException"%> 4 <%@page import="com.jaovo.msg.model.User"%> 5 <%@ page language="java" contentType="text/html; charset=UTF-8" 6 pageEncoding="UTF-8"%> 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 10 <% 11 //接收客户端传递过来的参数 12 13 String username = request.getParameter("username"); 14 String password = request.getParameter("password"); 15 String nickname = request.getParameter("nickname"); 16 17 18 19 try{ 20 if(!password.equals("王建民")&&!password.equals("刘丹")&&!password.equals("刘立嘉")) 21 { 22 throw new UserException( "教师名不存在"); 23 24 } 25 if(!nickname.startsWith("基教")&&!nickname.startsWith("一教")&&!nickname.startsWith("二教")&&!nickname.startsWith("三教")) 26 { 27 throw new UserException( "教室不存在"); 28 } 29 User user = new User(); 30 user.setUsername(username); 31 user.setPassword(password); 32 user.setNickname(nickname); 33 34 UserDaoImpl userDao = new UserDaoImpl(); 35 36 userDao.add(user); 37 %> 38 39 40 课程保存成功!!<br> 41 <a href="addInput.jsp">继续添加</a><br> 42 43 <% 44 }catch(UserException e){ 45 %> 46 <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2> 47 <% 48 } 49 %> 50 </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>课程添加页面</title> 7 </head> 8 <body> 9 10 <form action="add.jsp" method="get"> 11 <table align="center" border="1" width="500"> 12 <tr> 13 <td>课程名称 : </td> 14 <td> 15 <input type="text" name="username" /> 16 17 </td> 18 </tr> 19 <tr> 20 <td>任课教师:</td> 21 <td> 22 <input type="text" name="password" /> 23 </td> 24 </tr> 25 <tr> 26 <td>上课地点:</td> 27 <td> 28 <input type="text" name="nickname" /> 29 </td> 30 </tr> 31 <tr align="center"> 32 <td colspan="2"> 33 <input type="submit" value="保存" /> 34 35 </td> 36 </tr> 37 </table> 38 </form> 39 </body> 40 </html>
1 package com.jaovo.msg.dao; 2 3 4 5 import java.util.List;以上是关于软件工程概论课堂测试一（设计添加新课程界面）的主要内容，如果未能解决你的问题，请参考以下文章