课堂练习：增加信息

一，程序设计思想

　　首先使用jsp设计添加界面，该界面应包含一个提交按钮和三个输入框

　　其次使用SQL语句在后台建立对应的表结构以存储课程信息，该表应至少含有课程信息，教师信息，上课地点三列，为以后着想，可以增加id列。

　　然后新建add.jsp文件用以接收用户传来的参数，并在数据库中插入

　　为判断教师姓名，上课地点，在添加界面，当用户提交的教师姓名，上课地点不符合要求，则跳转到报错页面

二，源程序代码

 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>信息添加页面</title>
 7 </head>
 8 <body>
 9     <form action="add.jsp" method="get">
10         <table align="center" border="1" width="500">
11             <tr>
12                 <td> 课程名称 </td>
13                 <td>
14                     <input type="text" name="classname" style=" 300px; "/>
15                 </td>
16             </tr>
17                 <tr>
18                 <td>课程教师</td>
19                 <td>
20                     <input type="text" name="teachername" style=" 300px; "/>
21                 </td>
22             </tr>
23             <tr>
24                 <td>上课教室</td>
25                 <td>
26                     <input type="text" name="place" style=" 300px; "/>
27                 </td>
28             </tr>
29             <tr align="center">
30                 <td colspan="2">
31                     <input type="submit" value="保存" style="color: Blue; background-color: Lime; height: 70px;  200px"/>
32                 </td>
33             </tr>
34         </table>
35     </form>
36 </body>
37 </html>

View Code

 1 <%@page import="com.jaovo.msg.teach.shujuku"%>
 2 <%@page import="com.jaovo.msg.teach.student"%>
 3 <%@ page language="java" contentType="text/html; charset=UTF-8"
 4     pageEncoding="UTF-8"%>
 5 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 6 <html>
 7 <%
 8     //接收客户端传递过来的参数
 9     String classname = request.getParameter("classname");
10     String teachername = request.getParameter("teachername");
11     String place = request.getParameter("place");
12     student st=new student();
13     System.out.println(classname);
14     st.setClassname(classname);
15     st.setTeachername(teachername);
16     st.setPlace(place);
17     shujuku s = new shujuku();
18     try{
19         s.gets(st);
20     }
21     catch(NullPointerException q)
22     {
23         q.printStackTrace();
24     }
25 
26     %>
27 </html>

View Code

package com.jaovo.msg.teach;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.jaovo.msg.Util.DBUtil;
public class shujuku {    
    public void gets(student st) {
        
        //获得链接对象
        ResultSet resultSet=null;
        PreparedStatement preparedStatement = null;
        Connection connection = DBUtil.getConnection();
        //准备sql语句
        String sql = "insert into myclass(classname,teachername,place) values(?,?,?)";
            try {
                preparedStatement = connection.prepareStatement(sql);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                preparedStatement.setString(1, st.getClassname());
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                preparedStatement.setString(2, st.getTeachername());
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                preparedStatement.setString(3, st.getPlace());
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                preparedStatement.executeUpdate();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            //关闭资源
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }    
}

View Code

 1 package com.jaovo.msg.teach;
 2 
 3 public class student {
 4     
 5     private int id;
 6     public int getId() {
 7         return id;
 8     }
 9     public void setId(int id) {
10         this.id = id;
11     }
12     private String  teachername;
13     private String  classname;
14     private String  place;
15     public String getTeachername() {
16         return teachername;
17     }
18     public void setTeachername(String teachername) {
19         this.teachername = teachername;
20     }
21     public String getClassname() {
22         return classname;
23     }
24     public void setClassname(String classname) {
25         this.classname = classname;
26     }
27     public String getPlace() {
28         return place;
29     }
30     public void setPlace(String place) {
31         this.place = place;
32     }
33 }

View Code

 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     public  static  Connection getConnection() {
11         try {
12             //1 加载驱动
13             Class.forName("com.mysql.jdbc.Driver").newInstance();
14         } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
15             // TODO Auto-generated catch block
16             e.printStackTrace();
17         }
18         String username = "root";
19         String password = "root";
20         String url = "jdbc:mysql://localhost:3306/class";
21         Connection connection = null;
22         try {
23             //2 创建链接对象connection
24             connection = DriverManager.getConnection(url,username,password);
25         } catch (SQLException e) {
26             // TODO Auto-generated catch block
27             e.printStackTrace();
28         }
29         return connection;
30     }
31     //关闭资源的方法
32     public static void close(Connection connection ) {
33         try {
34             if (connection != null) {
35                 connection.close();
36             }
37         } catch (SQLException e) {
38             // TODO Auto-generated catch block
39             e.printStackTrace();
40         }
41     }
42     public static void close(PreparedStatement preparedStatement ) {
43         try {
44             if (preparedStatement != null) {
45                 preparedStatement.close();
46             }    
47         } catch (SQLException e) {
48             // TODO Auto-generated catch block
49             e.printStackTrace();
50         }
51     }
52     public static void close(ResultSet resultSet ) {
53         try {
54             if (resultSet != null) {
55                 resultSet.close();
56             }    
57         } catch (SQLException e) {
58             // TODO Auto-generated catch block
59             e.printStackTrace();
60         }
61     }
62 }

View Code

 1 package com.jaovo.msg.Util;
 2 
 3 public class UserException extends RuntimeException{
 4 
 5     private static final long serialVersionUID = 1L;
 6 
 7     public UserException() {
 8         super();
 9         // TODO Auto-generated constructor stub
10     }
11 
12     public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
13         super(message, cause, enableSuppression, writableStackTrace);
14         // TODO Auto-generated constructor stub
15     }
16 
17     public UserException(String message, Throwable cause) {
18         super(message, cause);
19         // TODO Auto-generated constructor stub
20     }
21 
22     public UserException(String message) {
23         super(message);
24         // TODO Auto-generated constructor stub
25     }
26 
27     public UserException(Throwable cause) {
28         super(cause);
29         // TODO Auto-generated constructor stub
30     }
31 
32 }

View Code

SQL语句

 1 create database class;
 2 use class;
 3 GRANT ALL ON class.* to "jaovo"@"localhost" IDENTIFIED BY "root";
 4 create table myclass(
 5      id int(10) primary key auto_increment,
 6      classname varchar(255),
 7      teachername varchar(255),
 8      place varchar(255))
11 );

View Code

三，运行效果截图

下面是在Navicat里的结果

项目计划日志

　　估计需要花费两个小时

　　实际花费三个小时

时间记录日志

缺陷记录日志

MySQL数据库中文编码问题

提交后无提示语句

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原文地址：https://www.cnblogs.com/sdysyhj/p/7911926.html