依托Myeclipse的JAVA编程实战演练
一、实现目标。
通过可视化窗口实现系统的账号登录与注册（极简版），账号与密码储存在数据库中。
二、构建可视化窗口。
三、构建数据库。
构建数据库student，表名login，三列：name，password，email。
账户：root 密码 1024117065.
数据库的构建请查阅相关资料。
四、驱动加载。
右键工程文件->选择properties->java Build Path ->Add External JARs.....->选择已经下载好的程序包
五、代码实现。
1、主函数
package main; import ui.login; public class Main { /** * @param args *； */ public static void main(String[] args) { // TODO Auto-generated method stub login lf =new login(); lf.setTitle("登录页面"); lf.setVisible(true); lf.setResizable(false); // lf.setBounds(100, 150, 350, 300); } }
2、登录界面：
/* * login.java * * Created on __DATE__, __TIME__ */ package ui; import java.sql.*; import javax.swing.JOptionPane; /** * * @author __USER__ */ public class login extends javax.swing.JFrame { /** Creates new form login */ public login() { initComponents(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ //GEN-BEGIN:initComponents // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jFormattedTextField1 = new javax.swing.JFormattedTextField(); jPasswordField1 = new javax.swing.JPasswordField(); jButton1 = new javax.swing.JButton(); jButton2 = new javax.swing.JButton(); label1 = new java.awt.Label(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jLabel1.setText("u7528u6237u540d"); jLabel2.setText("u5bc6u7801"); jFormattedTextField1 .addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jFormattedTextField1ActionPerformed(evt); } }); jPasswordField1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jPasswordField1ActionPerformed(evt); } }); jButton1.setText("u767bu5f55"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jButton2.setText("u6ce8u518c"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); label1.setFont(new java.awt.Font("Dialog", 0, 36)); label1.setText("u767bu5f55u9875u9762"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout( getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup(layout .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout.createSequentialGroup() .addGap(66, 66, 66) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(jLabel2) .addComponent(jLabel1)) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.TRAILING, false) .addGroup( javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup() .addComponent( jButton1) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent( jButton2)) .addComponent( jPasswordField1, javax.swing.GroupLayout.Alignment.LEADING) .addComponent( jFormattedTextField1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 191, Short.MAX_VALUE)) .addContainerGap(115, Short.MAX_VALUE)) .addGroup( javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addGap(128, 128, 128) .addComponent(label1, javax.swing.GroupLayout.DEFAULT_SIZE, 191, Short.MAX_VALUE) .addGap(94, 94, 94))); layout.setVerticalGroup(layout .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout.createSequentialGroup() .addContainerGap() .addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(11, 11, 11) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent( jFormattedTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(jLabel2) .addComponent( jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(18, 18, 18) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton1) .addComponent(jButton2)) .addContainerGap(39, Short.MAX_VALUE))); pack(); }// </editor-fold> //GEN-END:initComponents private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { log lf = new log(); lf.setTitle("注册页面"); lf.setVisible(true); lf.setResizable(false); } private void jPasswordField1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jFormattedTextField1ActionPerformed( java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: try { Class.forName("com.mysql.jdbc.Driver"); Connection conn = DriverManager .getConnection("jdbc:mysql://localhost:1234/student", "root", "1024117065"); Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery("select * from login"); String na = jFormattedTextField1.getText(); String jp = new String(jPasswordField1.getPassword()); boolean find = false; while (rs.next()) { if (na.equals(rs.getString("name")) && jp.equals(rs.getObject("password"))) { find = true; this.dispose(); RuFram sf = new RuFram(); sf.setTitle("主页面"); sf.setVisible(true); sf.setResizable(false); } } if (find == false) { JOptionPane.showMessageDialog(null, "用户" + "不存在或者密码错误！"); } } catch (Exception e) { System.out.println("err" + e.getMessage()); } } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new login().setVisible(true); } }); } //GEN-BEGIN:variables // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JFormattedTextField jFormattedTextField1; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JPasswordField jPasswordField1; private java.awt.Label label1; // End of variables declaration//GEN-END:variables }
3、注册界面：
/* * log.java * * Created on __DATE__, __TIME__ */ package ui; import java.sql.*; import javax.swing.JOptionPane; /** * * @author __USER__ */ public class log extends javax.swing.JFrame { /** Creates new form log */ public log() { initComponents(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ //GEN-BEGIN:initComponents // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel1 = new javax.swing.JLabel(); jTextField1 = new javax.swing.JTextField(); jLabel2 = new javax.swing.JLabel(); jTextField2 = new javax.swing.JTextField(); jLabel3 = new javax.swing.JLabel(); jTextField3 = new javax.swing.JTextField(); jButton1 = new javax.swing.JButton(); jButton2 = new javax.swing.JButton(); label1 = new java.awt.Label(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jLabel1.setText("u7528u6237u540d"); jTextField1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jTextField1ActionPerformed(evt); } }); jLabel2.setText("u5bc6u7801"); jLabel3.setText("u90aeu7bb1"); jButton1.setText("u786eu5b9a"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jButton2.setText("u5173u95ed"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); label1.setFont(new java.awt.Font("Dialog", 0, 24)); label1.setText("u6ce8u518cu9875u9762"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout( getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup(layout .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout.createSequentialGroup() .addGap(61, 61, 61) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup( layout.createSequentialGroup() .addComponent( jButton1) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent( jButton2)) .addGroup( layout.createSequentialGroup() .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.TRAILING, false) .addComponent( jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent( jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent( jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent( jTextField3) .addComponent( jTextField2) .addComponent( jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 118, Short.MAX_VALUE) .addComponent( label1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))) .addContainerGap(94, Short.MAX_VALUE))); layout.setVerticalGroup(layout .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout.createSequentialGroup() .addContainerGap() .addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(30, 30, 30) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent( jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent( jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel2)) .addGap(18, 18, 18) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent( jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel3)) .addGap(34, 34, 34) .addGroup( layout.createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton1) .addComponent(jButton2)) .addContainerGap(37, Short.MAX_VALUE))); pack(); }// </editor-fold> //GEN-END:initComponents private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: dispose(); } private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { /** * 1:向数据库中添加数据 * @author biexiansheng * */ try { Class.forName("com.mysql.jdbc.Driver"); Connection conn = DriverManager .getConnection("jdbc:mysql://localhost:1234/student", "root", "1024117065"); System.out.println("加载数据库驱动成功"); Statement stmt = conn.createStatement();//创建一个Statement对象 // ResultSet rs = stmt.executeQuery("select * from login"); //建立数据库连接，获得连接对象conn(抛出异常即可) System.out.println("连接数据库成功"); //生成一条mysql语句 ResultSet rs = stmt.executeQuery("select * from login"); String name = jTextField1.getText(); String password = jTextField2.getText(); String email = jTextField3.getText(); boolean find = true; while (rs.next()) { if (name.equalsIgnoreCase(rs.getString("name"))) { find = false; }//查找name是否存在于数据库 } if (find) { String sql = "INSERT INTO login(name,password,email) VALUES ('" + name + "','" + password + "','" + email + "')";//定义sql语句 stmt.executeUpdate(sql);//执行sql语句 System.out.println("插入到数据库成功"); conn.close(); System.out.println("关闭数据库成功"); JOptionPane.showMessageDialog(null, "注册成功");//弹出窗口 dispose(); } else { JOptionPane.showMessageDialog(null, "用户" + name + "已经被注册"); } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); }// catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new log().setVisible(true); } }); } //GEN-BEGIN:variables // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JTextField jTextField1; private javax.swing.JTextField jTextField2; private javax.swing.JTextField jTextField3; private java.awt.Label label1; // End of variables declaration//GEN-END:variables }
六、TIP：
若需要程序源文件以及相关软件，联系QQ1024117065
部分内容参加本人其他博客。