课堂练习-增加信息

Posted 2020-10-16 ╄冷丶夜♂

程序设计思想：

1.创建程序所需要用到的一些类，根据功能分包存放：

　　其中ClassInfo定义三个私有属性：name、teacher、place，并对它们创建get与set方法

2.在WebContent目录下建立addclass.jsp文件，在此jsp文件中添加表单，通过表单将输入的信息提交至本页面，经过本Jsp页面的处理将信息添加至数据库，并通过javascript脚本弹出提示对话框。

源程序代码如下：

DBUtil.java:

 1 package com.jaovo.msg.Util;
 2 import java.sql.Connection;
 3 import java.sql.DriverManager;
 4 import java.sql.PreparedStatement;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 
 8 public class DBUtil {
 9     
10     public  static  Connection getConnection() {
11         try {
12             Class.forName("com.mysql.jdbc.Driver").newInstance();
13         } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
14             // TODO Auto-generated catch block
15             e.printStackTrace();
16         }
17         String user = "root";
18         String password = "root";
19         String url = "jdbc:mysql://localhost:3306/jaovo_msg";
20         Connection connection = null;
21         try {
22              connection = DriverManager.getConnection(url,user,password);
23         } catch (SQLException e) {
24             // TODO Auto-generated catch block
25             e.printStackTrace();
26         }
27         return connection;
28     }
29     
30     public static void close(Connection connection ) {
31         try {
32             if (connection != null) {
33                 connection.close();
34             }
35             
36         } catch (SQLException e) {
37             // TODO Auto-generated catch block
38             e.printStackTrace();
39         }
40     }
41     public static void close(PreparedStatement preparedStatement ) {
42         try {
43             if (preparedStatement != null) {
44                 preparedStatement.close();
45             }
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             
58         } catch (SQLException e) {
59             // TODO Auto-generated catch block
60             e.printStackTrace();
61         }
62     }
63 }

ClassInfo.java

 1 package com.jaovo.msg.model;
 2 
 3 public class ClassInfo {
 4     private String name;
 5     private String teacher;
 6     private String place;
 7     
 8     public ClassInfo(String name, String teacher, String place) {
 9         this.name = name;
10         this.teacher = teacher;
11         this.place = place;
12     }
13     public String getName() {
14         return name;
15     }
16     public void setName(String name) {
17         this.name = name;
18     }
19     public String getTeacher() {
20         return teacher;
21     }
22     public void setTeacher(String teacher) {
23         this.teacher = teacher;
24     }
25     public String getPlace() {
26         return place;
27     }
28     public void setPlace(String place) {
29         this.place = place;
30     }
31 }

IClassDao.java:

1 package com.jaovo.msg.dao;
2 
3 import com.jaovo.msg.model.ClassInfo;
4 
5 public interface IClassDao {
6     public void add(ClassInfo clas);
7 }

ClassDaoImpl.java:

 1 package com.jaovo.msg.dao;
 2 
 3 import java.sql.Connection;
 4 import java.sql.PreparedStatement;
 5 import java.sql.SQLException;
 6 
 7 import com.jaovo.msg.Util.DBUtil;
 8 import com.jaovo.msg.model.ClassInfo;
 9 
10 public class ClassDaoImpl implements IClassDao{
11 
12     @Override
13     public void add(ClassInfo clas) {
14         // TODO Auto-generated method stub
15         Connection con = DBUtil.getConnection();
16         String sql = "insert into class_info(classname,teacher,place) value (?,?,?)";
17         PreparedStatement ps = null;
18         try {
19             ps = con.prepareStatement(sql);
20             ps.setString(1, clas.getName());
21             ps.setString(2, clas.getTeacher());
22             ps.setString(3, clas.getPlace());
23             ps.executeUpdate();
24         } catch (SQLException e) {
25             // TODO Auto-generated catch block
26             e.printStackTrace();
27         }finally{
28             DBUtil.close(ps);
29             DBUtil.close(con);
30         }
31     }
32 
33 }

运行结果截图：