项目使用mysql数据库,有2张表格。一张用户表用于登录验证,一张学生表,用于增删改查。
creat table t_user( id int primary key auto_increment, login_name varchar(255), login_pwd varchar(255), real_name varchar(255), ); insert into t_user(id,login_name,login_pwd,real_name) values('akm',"123",'萝卜蹲'); CREATE TABLE t_user( id char(12) PRIMARY KEY, name char(6), pwd varchar(255), );
1.1登录界面
在用户烂输入:akm
密码栏输入:123
点击登录按钮,就可以直接进入系统。
如果输入错误,状态栏会显示登录失败,并清空登录账户和密码。
1.2系统主界面
系统主界面由5个按钮组成
要添加学生信息,请在主界面上选择添加按钮并点击,即可进入如上图所示的添加界面。在界面中添加相应的学生信息,id,姓名,年龄 学籍等。
1.3查询信息
通过id查询学生信息。
1.4遍历信息
1.5 删除信息
输入id直接删除。
1.6 更新信息
项目只有一个test文件,没有封装,有需要的小伙伴可以自己进行封装。
代码如下:
package com.company; import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.*; import java.sql.Statement; import java.util.Scanner; public class Test { static Connection conn ; static Statement statement; public static void main(String[] args) { Scanner in = new Scanner(System.in); login(); } public static void control() { JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(new FlowLayout(FlowLayout.LEFT)); jf.setBounds(400, 300, 300, 200); JButton button = new JButton("更新"); JButton button1=new JButton("遍历"); JButton button2=new JButton("删除"); JButton button3=new JButton("添加"); JButton button4=new JButton("查询"); jf.add(button); jf.add(button1); jf.add(button2); jf.add(button3); jf.add(button4); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { update(); } }); button1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { query(); } }); button2.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { delete(); } }); button3.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { insert(); } }); button4.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) {onequery();} }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static void update() { conn = getConnection(); JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(new FlowLayout(FlowLayout.LEFT)); jf.setBounds(400, 300, 300, 200); JLabel label1 = new JLabel("年龄"); JTextField agetext = new JTextField("", 10); JLabel label2 = new JLabel("id"); JTextField idtext = new JTextField("", 10); JLabel label3 = new JLabel("学籍"); JTextField addresstext = new JTextField("", 10); JLabel label4 = new JLabel("姓名"); JTextField nametext = new JTextField("", 5); JTextField out = new JTextField("更新状态", 20); JButton button = new JButton("更新"); jf.add(label1); jf.add(agetext); jf.add(label2); jf.add(idtext); jf.add(label3); jf.add(addresstext); jf.add(label4); jf.add(nametext); jf.add(out); jf.add(button); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { PreparedStatement ps=null; String age = agetext.getText(); String id = idtext.getText(); String address= addresstext.getText(); String name=nametext.getText(); try { // 更新数据的sql语句 String sql = "update student set age =? , address =?, name=? where id = ?"; ps=conn.prepareStatement(sql); ps.setString(1,agetext.getText()); ps.setString(2,addresstext.getText()); ps.setString(3,nametext.getText()); ps.setString(4,idtext.getText()); int count = ps.executeUpdate();//记录操作次数 // 输出插入操作的处理结果 System.out.println("user表中更新 " + count + " 条数据"); ps.close(); //关闭数据库连接 conn.close(); out.setText("更新成功!!!!!!!!"); // 创建用于执行静态sql语句的Statement对象,st属局部变量 } catch (SQLException a) { System.out.println("更新数据失败"); } } }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static void query() { PreparedStatement ps=null; conn = getConnection(); JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(null); jf.setBounds(400, 300, 350, 200); JButton button = new JButton("查询"); JTextArea jm=new JTextArea("ID\t姓名\t年龄\t学籍");//显示界面 jm.setBounds(10,50,350,100);//定义显示界面位置 jf.add(button); jf.add(jm); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { PreparedStatement ps=null; try { String sql = "select * from Student"; //创建用于执行静态sql语句的Statement对象,statement属局部变量 statement = conn.createStatement();//获取操作对象 ResultSet resultSet = statement.executeQuery(sql);// executeQuery执行单个SQL语句,返回单个ResultSet对象是 while (resultSet.next())//循环没有数据的时候返回flase退出循环 { Integer Id = resultSet.getInt("id");//resultSet.next()是一个光标 String name = resultSet.getString("name");//getString返回的值一定是string Integer age = resultSet.getInt("age"); String address=resultSet.getString("address"); //String adress = resultSet.getString("adress"); //输出查到的记录的各个字段的值 jm.append("\n"+Id + "\t" + name + "\t" + age+ "\t" + address ); } statement.close(); conn.close(); }catch (SQLException b){ System.out.println("查询失败!!!!!!!!"); } } }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static void delete() { conn = getConnection(); JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(new FlowLayout(FlowLayout.LEFT)); jf.setBounds(400, 300, 300, 200); JLabel label2 = new JLabel("id"); JTextField idtext = new JTextField("", 10); JTextField out = new JTextField("删除状态", 20); JButton button = new JButton("删除"); jf.add(label2); jf.add(idtext); jf.add(out); jf.add(button); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String id = idtext.getText(); PreparedStatement ps=null; try { // 删除数据的sql语句 String sql = "delete from Student where id = ?"; ps=conn.prepareStatement(sql); ps.setString(1,idtext.getText()); int count = ps.executeUpdate();//记录操作次数 // 输出插入操作的处理结果 System.out.println("student表中删除 " + count + " 条数据"); ps.close(); out.setText("删除成功!!!!!!!!"); // 关闭数据库连接 conn.close(); } catch (SQLException c) { System.out.println("删除数据失败"); } } }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static void insert() { // 首先要获取连接,即连接到数据库 conn = getConnection(); JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(new FlowLayout(FlowLayout.LEFT)); jf.setBounds(400, 300, 300, 200); JLabel label3 = new JLabel("id"); JTextField idtext = new JTextField("", 10); JLabel label1 = new JLabel("年龄"); JTextField agetext = new JTextField("", 10); JLabel label2 = new JLabel("姓名"); JTextField nametext = new JTextField("", 10); JLabel label4 = new JLabel("学籍"); JTextField addresstext = new JTextField("", 5); JTextField out = new JTextField("添加状态", 20); JButton button = new JButton("添加"); jf.add(label3); jf.add(idtext); jf.add(label1); jf.add(agetext); jf.add(label2); jf.add(nametext); jf.add(label4); jf.add(addresstext); jf.add(out); jf.add(button); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String age = agetext.getText(); String name = nametext.getText(); String id=idtext.getText(); String address=addresstext.getText(); try { PreparedStatement ps=null; // 插入数据的sql语句 String sql = "INSERT INTO Student( id,age,name,address) VALUES ( ?,?,?,?)"; ps=conn.prepareStatement(sql); ps.setString(1,idtext.getText()); ps.setString(2,agetext.getText()); ps.setString(3,nametext.getText()); ps.setString(4,addresstext.getText()); int count = ps.executeUpdate();//记录操作次数 // 输出插入操作的处理结果 System.out.println("向user表中插入 " + count + " 条数据"); ps.close(); out.setText("添加成功!!!!!!!!"); // 关闭数据库连接 conn.close(); } catch (SQLException d) { System.out.println("插入数据失败" + d.getMessage()); } } }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static boolean login(){ conn = getConnection(); JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(new FlowLayout(FlowLayout.LEFT)); jf.setBounds(400, 300, 300, 200); JLabel label1 = new JLabel("用户名"); JTextField usernametext = new JTextField("", 20); JLabel label2 = new JLabel("密码"); JPasswordField pwdtext = new JPasswordField("", 20); JTextField out = new JTextField("登录状态", 20); JButton button = new JButton("登录"); jf.add(label1); jf.add(usernametext); jf.add(label2); jf.add(pwdtext); jf.add(out); jf.add(button); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // 插入数据的sql语句 PreparedStatement ps=null; try { statement = conn.createStatement();//获取操作对象 String x = usernametext.getText(); String y = pwdtext.getText(); String sql ="select * from user"; ResultSet resultSet = statement.executeQuery(sql); while(resultSet.next()){ String a=resultSet.getString("login_name"); String b=resultSet.getString("login_pwd"); if(a.equals(x)&&b.equals(y)) { control(); out.setText("!!!!!登录成功!!!!!"); } else if(x!=a&&y!=b){ out.setText("登录失败,请重新输入"); } } usernametext.setText(""); pwdtext.setText(""); } catch (SQLException throwables) { throwables.printStackTrace(); } } }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); boolean ok = true; return ok; } public static void onequery() { PreparedStatement ps=null; conn = getConnection(); JFrame jf = new JFrame("学生学籍管理系统"); jf.setLayout(new FlowLayout(FlowLayout.LEFT)); jf.setBounds(400, 300, 350, 200); JLabel label3 = new JLabel("id"); JTextField idtext = new JTextField("", 10); JLabel label1 = new JLabel("条件"); JTextField atext = new JTextField("", 10); JButton button = new JButton("查询"); //JTextArea jm=new JTextArea("ID\t姓名\t年龄\t学籍");//显示界面 //jm.setBounds(10,50,350,100);//定义显示界面位置 jf.add(label3); jf.add(idtext); jf.add(button); //jf.add(jm); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { PreparedStatement ps=null; String id=idtext.getText(); conn = getConnection(); try { String sql = "select * from student where id = ?"; //创建用于执行静态sql语句的Statement对象,statement属局部变量 ps=conn.prepareStatement(sql);//获取操作对象 ps.setString(1,idtext.getText().toString()); ResultSet resultSet = ps.executeQuery();// executeQuery执行单个SQL语句,返回单个ResultSet对象是 while (resultSet.next())//循环没有数据的时候返回flase退出循环 { Integer Id = resultSet.getInt("id");//resultSet.next()是一个光标 String name = resultSet.getString("name");//getString返回的值一定是string Integer age = resultSet.getInt("age"); String address=resultSet.getString("address"); System.out.println(Id + " " + name + " " + age + " "+ address + " " ); //输出查到的记录的各个字段的值 //jm.append("\n"+Id + "\t" + name + "\t" + age+ "\t" + address ); } statement.close(); conn.close(); }catch (SQLException m){ System.out.println(m.getMessage()); System.out.println("查询失败!!!!!!!!"); } } }); jf.setVisible(true); jf.setResizable(false); button.setSize(40, 20); jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static Connection getConnection(){ //创建用于连接数据库的Connection对象 Connection connection = null; try { // 加载Mysql数据驱动 Class.forName("com.mysql.cj.jdbc.Driver"); System.out.println("数据库驱动加载成功"); String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai"; // 创建数据连接 connection = DriverManager.getConnection(url, "root", "root"); System.out.println("数据库连接成功"); }catch (ClassNotFoundException | SQLException e){ System.out.println("数据库连接失败" + e.getMessage());//处理查询结果 } return connection; } }
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