Java学习二十三--新课程添加
作者：互联网
这次的任务要求实现数据库连接和界面操作
一、需求（思路）
1、创建课程类，实现get和set方法
2、创建辅助类，连接数据库。
3、创建插入类，将数据添加至数据库
4、创建前端.jsp文件
5、创建后端.jsp文件
二、代码
1、
1 package AddCurriculum;
2 //课程类
3 public class HaveClass {
4 private String classname;//课程姓名
5 private String teachername;//教师名称
6 private String place;//上课地点
7
8 public String getclassname() {
9 return classname;
10 }
11 public void setclassname(String classname) {
12 this.classname=classname;
13 }
14
15 public String getteachername() {
16 return teachername;
17 }
18 public void setteachername(String teachername) {
19 this.teachername=teachername;
20 }
21
22 public String getplace() {
23 return place;
24 }
25 public void setplace(String place) {
26 this.place=place;
27 }
28
29
30
31
32
33
34 }
2、
1 package com.msg;
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
10 public class DButil {
11 public static Connection getConnection() {
12 try {
13 Class.forName("com.mysql.jdbc.Driver");
14 } catch (ClassNotFoundException e) {
15 // TODO Auto-generated catch block
16 e.printStackTrace();
17 }
18 String user="root";
19 String passwd="passwd";//此处为mysql数据库密码
20 String url="jdbc:mysql://localhost:3306/curriculum";//curriculum是数据库的名称
21 Connection connection=null;
22 try {
23 connection=DriverManager.getConnection(url,user,passwd);
24 } catch (SQLException e) {
25 // TODO Auto-generated catch block
26 e.printStackTrace();
27 }
28 return connection;
29 }
30
31 public static void close(Connection connection) {
32 try {
33 if(connection!=null) {
34 connection.close();
35 }
36 }catch(SQLException e) {
37 e.printStackTrace();
38 }
39 }
40
41 public static void close(PreparedStatement preparedStatement) {
42 try {
43 if(preparedStatement!=null) {
44 preparedStatement.close();
45 }
46 }catch(SQLException e) {
47 e.printStackTrace();
48 }
49 }
50
51 public static void close(ResultSet resultSet) {
52 try {
53 if(resultSet!=null) {
54 resultSet.close();
55 }
56 }catch(SQLException e) {
57 e.printStackTrace();
58 }
59 }
60 }
3、
1 package Insert;
2 //将数据添加至数据库中
3 import java.sql.*;
4
5 import com.msg.DButil;
6
7 import AddCurriculum.HaveClass;
8
9 public class ClassInsert {
10 public void add(HaveClass claz) {
11
12
13 //获取连接对象
14 Connection connection=DButil.getConnection();
15
16 //准备sql语句
17 String sql="insert into curr(classname,teachername,place) values(?,?,?)";
18 PreparedStatement preparedStatement=null;
19 try {
20 //创建语句传输对象
21 preparedStatement=connection.prepareStatement(sql);
22 preparedStatement=connection.prepareStatement(sql);
23 preparedStatement=connection.prepareStatement(sql);
24 preparedStatement.setString(1, claz.getclassname());
25 preparedStatement.setString(2,claz.getteachername());
26 preparedStatement.setString(3, claz.getplace());
27
28 preparedStatement.executeUpdate();
29 }catch(SQLException e) {
30 e.printStackTrace();
31 }finally {
32 //关闭资源
33 DButil.close(preparedStatement);
34 DButil.close(connection);
35 }
36 }
37 }
4、
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 <meta charset="UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 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="classname"/> 16 </td> 17 </tr> 18 <tr> 19 <td>任课教师：</td> 20 <td> 21 <input type="text" name="teachername"/> 22 </td> 23 </tr> 24 <tr> 25 <td>上课地点：</td> 26 <td> 27 <input type="text" name="place"/> 28 </td> 29 </tr> 30 <tr align="center"> 31 <td colspan="2"> 32 <input type="submit" value="提交"/> 33 <input type="reset" value="重复"/> 34 </td> 35 </tr> 36 </table> 37 </form> 38 </body> 39 </html>
5、
1 <%@page import="com.msg.ClassException"%>
2 <%@page import="Insert.ClassInsert"%>
3 <%@page import="AddCurriculum.HaveClass"%>
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
11 String teachername = request.getParameter("teachername");
12 String classname = request.getParameter("classname");
13 String place = request.getParameter("place");
14
15 HaveClass haveclass = new HaveClass();
16 haveclass.setclassname(classname);
17 haveclass.setteachername(teachername);
18 haveclass.setplace(place);
19
20 ClassInsert classDao = new ClassInsert();
21 classDao.add(haveclass);
22
23
24
25
26 %>
27
28
29 </html>
三、运行截图
此次的程序做的其实不够完善，我会接着改进，并将改进代码发表
标签：新课程,preparedStatement,Java,String,--,connection,sql,close,public 来源： https://www.cnblogs.com/jzz-111jy/p/15415430.html