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:
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:
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:
/* * 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:
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:
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查字典教程网。
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