最近正在学java和数据库,想起以前写的学生管理系统,都是从网上下载,敷衍了事。闲来无事,也就自己写了一个,不过功能实现的不是很多。
开发语言:java; 开发环境:Mysql, java; 开发工具:eclipse
开发此案例,首先得在电脑上有java开发环境和Mysql, java开发环境与Mysql的搭建,就不再叙述了,如果需要,请联系我最下面的联系方式:dingyelf@aliyun.com
此次系统比较简易:数据库中只有一个表:stu;功能:能够对学生增加、删除、修改。
开发步骤:
1.在数据库中建表:
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create table stu( stuId String, stuName String, stuSex String, stuAge int , stuJG String, stuDept Sring ); |
2.java 代码主要由四个类组成:
Test3包含主函数;StuModel用来刷新、呈现数据库;StuAddDiag用来实现增添读者功能;StuUpDiag是修改学生信息。具体代码如下:
Test3.java:
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import javax.swing.*; import java.util.*; import java.awt.*; import java.awt.event.*; import java.sql.Connection; import java.sql.Driver; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Statement; public class Test3 extends JFrame implements ActionListener { //定义一些控件 JPanel jp1,jp2; JLabel jl1,jl2; JButton jb1,jb2,jb3,jb4; JTable jt; JScrollPane jsp; JTextField jtf; StuModel sm; //定义连接数据库的变量 Statement stat = null ; PreparedStatement ps; Connection ct = null ; ResultSet rs = null ; public static void main(String[] args){ Test3 test3 = new Test3(); } //构造函数 public Test3(){ jp1 = new JPanel(); jtf = new JTextField( 10 ); jb1 = new JButton( "查询" ); jb1.addActionListener( this ); jl1 = new JLabel( "请输入名字:" ); jp1.add(jl1); jp1.add(jtf); jp1.add(jb1); jb2 = new JButton( "添加" ); jb2.addActionListener( this ); jb3 = new JButton( "修改" ); jb3.addActionListener( this ); jb4 = new JButton( "删除" ); jb4.addActionListener( this ); jp2 = new JPanel(); jp2.add(jb2); jp2.add(jb3); jp2.add(jb4); //创建模型对象 sm = new StuModel(); //初始化 jt = new JTable(sm); jsp = new JScrollPane(jt); //将jsp放入到jframe中 this .add(jsp); this .add(jp1, "North" ); this .add(jp2, "South" ); this .setSize( 600 , 400 ); //this.setLocation(300, 200); this .setDefaultCloseOperation(EXIT_ON_CLOSE); this .setVisible( true ); } public void actionPerformed(ActionEvent arg0) { //判断是哪个按钮被点击 if (arg0.getSource() == jb1){ System.out.println( "用户希望被查询..." ); //因为把对表的数据封装到StuModel中,可以比较简单的完成查询 String name = this .jtf.getText().trim(); //写一个sql语句 String sql = "select * from stu where stuName = '" +name+ "' " ; //构建一个数据模型类,并更新 sm = new StuModel(sql); //更新jtable jt.setModel(sm); } //一、弹出添加界面 else if (arg0.getSource() == jb2){ System.out.println( "添加..." ); StuAddDiag sa = new StuAddDiag( this , "添加学生" , true ); //重新再获得新的数据模型, sm = new StuModel(); jt.setModel(sm); } else if (arg0.getSource() == jb4){ //二、删除记录 //1.得到学生的ID int rowNum = this .jt.getSelectedRow(); //getSelectedRow会返回给用户点中的行 //如果该用户一行都没有选,就返回-1 if (rowNum == - 1 ){ //提示 JOptionPane.showMessageDialog( this , "请选中一行" ); return ; } //得到学术ID String stuId = (String)sm.getValueAt(rowNum, 0 ); System.out.println( "Id: " +stuId); //连接数据库,完成删除任务 try { //1.加载驱动 Class.forName( "com.mysql.jdbc.Driver" ); //2.连接数据库 String url = "jdbc:mysql://localhost:3306/spdb1" ; String user = "root" ; String passwd = "lfdy" ; ct = DriverManager.getConnection(url, user, passwd); System.out.println( "连接成功" ); ps = ct.prepareStatement( "delete from stu where stuId = ?" ); ps.setString( 1 ,stuId); ps.executeUpdate(); } catch (Exception e){ e.printStackTrace(); } finally { try { if (rs!= null ){ rs.close(); rs = null ; } if (ps!= null ){ ps.close(); ps = null ; } if (ct != null ){ ct.close(); ct = null ; } } catch (Exception e){ e.printStackTrace(); } } sm = new StuModel(); //更新jtable jt.setModel(sm); } else if (arg0.getSource() == jb3){ System.out.println( "11111" ); //三、用户希望修改 int rowNum = this .jt.getSelectedRow(); if (rowNum == - 1 ){ //提示 JOptionPane.showMessageDialog( this , "请选择一行" ); return ; } //显示对话框 System.out.println( "12435" ); StuUpDiag su = new StuUpDiag( this , "修改学术" , true , sm, rowNum); sm = new StuModel(); jt.setModel(sm); } } } |
StuModel.java:
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/* * 这是我的一个stu表的模型 * 可以把对学生表的操作全都封装到这个类 */ package com.test2; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import java.util.Vector; import javax.swing.table.*; public class StuModel extends AbstractTableModel{ //rowData存放行数据,columnNames存放列名 Vector rowData,columnNames; //定义连接数据库的变量 Statement stat = null ; Connection ct = null ; ResultSet rs = null ; //初始化 public void init(String sql){ if (sql.equals( "" )){ sql = "select * from stu" ; } //中间 //设置列名 columnNames = new Vector(); columnNames.add( "学号" ); columnNames.add( "名字" ); columnNames.add( "性别" ); columnNames.add( "年龄" ); columnNames.add( "籍贯" ); columnNames.add( "门派" ); //rowData存放多行 rowData = new Vector(); try { //1.加载驱动 Class.forName( "com.mysql.jdbc.Driver" ); System.out.println( "加载成功" ); //2.连接数据库 //定义几个常量 String url = "jdbc:mysql://localhost:3306/spdb1" ; String user = "root" ; String passwd = "lfdy" ; ct = DriverManager.getConnection(url,user,passwd); stat = ct.createStatement(); //创建stat对象 rs = stat.executeQuery(sql); //查询结果 while (rs.next()){ Vector hang = new Vector(); hang.add(rs.getString( 1 )); hang.add(rs.getString( 2 )); hang.add(rs.getString( 3 )); hang.add(rs.getInt( 4 )); hang.add(rs.getString( 5 )); hang.add(rs.getString( 6 )); //加入到rowData中 rowData.add(hang); } } catch (Exception e){ e.printStackTrace(); } finally { try { if (rs!= null ){ rs.close(); rs = null ; } if (stat != null ){ stat.close(); stat = null ; } if (ct != null ){ ct.close(); ct = null ; } } catch (Exception e){ e.printStackTrace(); } } } //增加学生函数 public void addStu(String sql){ //根据用户输入的sql语句,完成添加任务 } //第二个构造函数,通过传递的sql语句来获得数据模型 public StuModel(String sql){ this .init(sql); } //构造函数,用于初始化我的数据模型(表) public StuModel(){ this .init( "" ); } //得到共有多少行 public int getRowCount() { // TODO Auto-generated method stub return this .rowData.size(); } //得到共有多少列 public int getColumnCount() { // TODO Auto-generated method stub return this .columnNames.size(); } //得到某行某列的数据 public Object getValueAt( int row, int column) { // TODO Auto-generated method stub return ((Vector)( this .rowData.get(row))).get(column); } //得到属性名字 public String getColumnName( int column) { // TODO Auto-generated method stub return (String) this .columnNames.get(column); } } |
StuAddDiag.java:
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package com.test2; import javax.swing.JDialog; import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.Statement; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.*; public class StuAddDiag extends JDialog implements ActionListener { //定义我需要的swing组件 JLabel jl1,jl2,jl3,jl4,jl5,jl6; JTextField jf1,jf2,jf3,jf4,jf5,jf6; JPanel jp1,jp2,jp3; JButton jb1,jb2; //owner代笔父窗口,title是窗口的名字,modal指定是模式窗口()或者非模式窗口 public StuAddDiag(Frame owner,String title, boolean modal){ //调用父类方法 super (owner,title,modal); jl1 = new JLabel( "学号" ); jl2 = new JLabel( "名字" ); jl3 = new JLabel( "性别" ); jl4 = new JLabel( "年龄" ); jl5 = new JLabel( "籍贯" ); jl6 = new JLabel( "门派" ); jf1 = new JTextField( 10 ); jf2 = new JTextField( 10 ); jf3 = new JTextField( 10 ); jf4 = new JTextField( 10 ); jf5 = new JTextField( 10 ); jf6 = new JTextField( 10 ); jb1 = new JButton( "添加" ); jb1.addActionListener( this ); jb2 = new JButton( "取消" ); jp1 = new JPanel(); jp2 = new JPanel(); jp3 = new JPanel(); //设置布局 jp1.setLayout( new GridLayout( 6 , 1 )); jp2.setLayout( new GridLayout( 6 , 1 )); jp3.add(jb1); jp3.add(jb2); jp1.add(jl1); jp1.add(jl2); jp1.add(jl3); jp1.add(jl4); jp1.add(jl5); jp1.add(jl6); jp2.add(jf1); jp2.add(jf2); jp2.add(jf3); jp2.add(jf4); jp2.add(jf5); jp2.add(jf6); this .add(jp1, BorderLayout.WEST); this .add(jp2, BorderLayout.CENTER); this .add(jp3, BorderLayout.SOUTH); this .setSize( 300 , 200 ); this .setVisible( true ); } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub if (e.getSource() == jb1){ Connection ct = null ; PreparedStatement pstmt = null ; ResultSet rs = null ; try { //1.加载驱动 Class.forName( "com.mysql.jdbc.Driver" ); System.out.println( "加载成功" ); //2.连接数据库 //定义几个常量 String url = "jdbc:mysql://localhost:3306/spdb1" ; String user = "root" ; String passwd = "lfdy" ; ct = DriverManager.getConnection(url,user,passwd); //与编译语句对象 String strsql = "insert into stu values(?,?,?,?,?,?)" ; pstmt = ct.prepareStatement(strsql); //给对象赋值 pstmt.setString( 1 ,jf1.getText()); pstmt.setString( 2 ,jf2.getText()); pstmt.setString( 3 ,jf3.getText()); pstmt.setString( 4 ,jf4.getText()); pstmt.setString( 5 ,jf5.getText()); pstmt.setString( 6 ,jf6.getText()); pstmt.executeUpdate(); this .dispose(); //关闭学生对话框 } catch (Exception arg1){ arg1.printStackTrace(); } finally { try { if (rs!= null ){ rs.close(); rs = null ; } if (pstmt != null ){ pstmt.close(); pstmt = null ; } if (ct != null ){ ct.close(); ct = null ; } } catch (Exception arg2){ arg2.printStackTrace(); } } } } } |
StuUpDiag.java:
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package com.test2; /* * 修改学生 */ import javax.swing.JDialog; import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.Statement; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.*; public class StuUpDiag extends JDialog implements ActionListener { //定义我需要的swing组件 JLabel jl1,jl2,jl3,jl4,jl5,jl6; JTextField jf1,jf2,jf3,jf4,jf5,jf6; JPanel jp1,jp2,jp3; JButton jb1,jb2; //owner代笔父窗口,title是窗口的名字,modal指定是模式窗口()或者非模式窗口 public StuUpDiag(Frame owner,String title, boolean modal,StuModel sm, int rowNum){ //调用父类方法 super (owner,title,modal); jl1 = new JLabel( "学号" ); jl2 = new JLabel( "名字" ); jl3 = new JLabel( "性别" ); jl4 = new JLabel( "年龄" ); jl5 = new JLabel( "籍贯" ); jl6 = new JLabel( "门派" ); jf1 = new JTextField( 10 );jf1.setText((sm.getValueAt(rowNum, 0 )).toString()); jf2 = new JTextField( 10 );jf2.setText((String)sm.getValueAt(rowNum, 1 )); jf3 = new JTextField( 10 );jf3.setText(sm.getValueAt(rowNum, 2 ).toString()); jf4 = new JTextField( 10 );jf4.setText((sm.getValueAt(rowNum, 3 )).toString()); jf5 = new JTextField( 10 );jf5.setText((String)sm.getValueAt(rowNum, 4 )); jf6 = new JTextField( 10 );jf6.setText((String)sm.getValueAt(rowNum, 5 )); jb1 = new JButton( "修改" ); jb1.addActionListener( this ); jb2 = new JButton( "取消" ); jp1 = new JPanel(); jp2 = new JPanel(); jp3 = new JPanel(); //设置布局 jp1.setLayout( new GridLayout( 6 , 1 )); jp2.setLayout( new GridLayout( 6 , 1 )); jp3.add(jb1); jp3.add(jb2); jp1.add(jl1); jp1.add(jl2); jp1.add(jl3); jp1.add(jl4); jp1.add(jl5); jp1.add(jl6); jp2.add(jf1); jp2.add(jf2); jp2.add(jf3); jp2.add(jf4); jp2.add(jf5); jp2.add(jf6); this .add(jp1, BorderLayout.WEST); this .add(jp2, BorderLayout.CENTER); this .add(jp3, BorderLayout.SOUTH); this .setSize( 300 , 200 ); this .setVisible( true ); } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub if (e.getSource() == jb1){ Connection ct = null ; PreparedStatement pstmt = null ; ResultSet rs = null ; try { //1.加载驱动 Class.forName( "com.mysql.jdbc.Driver" ); System.out.println( "加载成功" ); //2.连接数据库 //定义几个常量 String url = "jdbc:mysql://localhost:3306/spdb1" ; String user = "root" ; String passwd = "lfdy" ; ct = DriverManager.getConnection(url,user,passwd); //与编译语句对象 String strsql = "insert into stu values(?,?,?,?,?,?)" ; pstmt = ct.prepareStatement(strsql); //给对象赋值 pstmt.setString( 1 ,jf1.getText()); pstmt.setString( 2 ,jf2.getText()); pstmt.setString( 3 ,jf3.getText()); pstmt.setString( 4 ,jf4.getText()); pstmt.setString( 5 ,jf5.getText()); pstmt.setString( 6 ,jf6.getText()); pstmt.executeUpdate(); this .dispose(); //关闭学生对话框 } catch (Exception arg1){ arg1.printStackTrace(); } finally { try { if (rs!= null ){ rs.close(); rs = null ; } if (pstmt != null ){ pstmt.close(); pstmt = null ; } if (ct != null ){ ct.close(); ct = null ; } } catch (Exception arg2){ arg2.printStackTrace(); } } } } } |
开发与测试结果:
1.系统主界面:
2.按名字查询:
3.选中一行,删除:
4.选中一行修改:
5.点击添加按钮,进行添加:
后续此系统将继续完善,有疑问和技术交流的,可联系本人:dingyelf@aliyun.com
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。