简单登陆系统例子.rar_登陆 java 简单_登陆入门案例_登陆系统_简单登陆_简单的登陆

package denglu; import java.awt.*; import java.awt.event.*; import javax.swing.*; import com.borland.jbcl.layout.*; import java.sql.*; /** * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2004</p> * <p>Company: </p> * @author not attributable * @version 1.0 */ public class Frame1 extends JFrame { JPanel contentPane; XYLayout xYLayout1 = new XYLayout(); JLabel jLabel1 = new JLabel(); JLabel jLabel2 = new JLabel(); JTextField jT1 = new JTextField(); JPasswordField jP1 = new JPasswordField(); JButton jButton1 = new JButton(); JButton jButton2 = new JButton(); JLabel jLabel3 = new JLabel(); JTextField jT2 = new JTextField(); JLabel jLabel4 = new JLabel(); JPasswordField jP2 = new JPasswordField(); JLabel jLabel5 = new JLabel(); JPasswordField jP3 = new JPasswordField(); //Construct the frame public Frame1() { enableEvents(AWTEvent.WINDOW_EVENT_MASK); try { jbInit(); } catch(Exception e) { e.printStackTrace(); } } //Component initialization private void jbInit() throws Exception { contentPane = (JPanel) this.getContentPane(); jLabel1.setFont(new java.awt.Font("Dialog", 0, 14)); jLabel1.setText("用户名："); contentPane.setLayout(xYLayout1); this.setSize(new Dimension(238, 257)); this.setTitle("用户登陆界面"); jLabel2.setText("密 码："); jLabel2.setFont(new java.awt.Font("Dialog", 0, 14)); jT1.setText(""); jP1.setText(""); jButton1.setText("登陆"); jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this)); jButton2.setText("退出"); jButton2.addActionListener(new Frame1_jButton2_actionAdapter(this)); jLabel3.setFont(new java.awt.Font("Dialog", 0, 14)); jLabel3.setText("提 示："); jT2.setText(""); jLabel4.setFont(new java.awt.Font("Dialog", 0, 14)); jLabel4.setText(" 新密码："); jP2.setText(""); jLabel5.setText(" 新密码："); jLabel5.setFont(new java.awt.Font("Dialog", 0, 14)); jP3.setText(""); contentPane.add(jButton2, new XYConstraints(131, 194, 58, 29)); contentPane.add(jButton1, new XYConstraints(37, 193, 58, 29)); contentPane.add(jT1, new XYConstraints(89, 6, 103, 28)); contentPane.add(jLabel1, new XYConstraints(30, 7, -1, -1)); contentPane.add(jLabel2, new XYConstraints(27, 39, -1, -1)); contentPane.add(jP1, new XYConstraints(90, 38, 105, 30)); contentPane.add(jLabel4, new XYConstraints(27, 70, -1, -1)); contentPane.add(jP2, new XYConstraints(90, 74, 105, 30)); contentPane.add(jLabel5, new XYConstraints(28, 111, -1, -1)); contentPane.add(jP3, new XYConstraints(91, 108, 105, 30)); contentPane.add(jLabel3, new XYConstraints(29, 156, -1, -1)); contentPane.add(jT2, new XYConstraints(93, 152, 103, 28)); } //Overridden so we can exit when window is closed protected void processWindowEvent(WindowEvent e) { super.processWindowEvent(e); if (e.getID() == WindowEvent.WINDOW_CLOSING) { System.exit(0); } } void jButton1_actionPerformed(ActionEvent e) { try{ Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); String url = "jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=Test"; String username = "sa"; String password = ""; Connection con = DriverManager.getConnection(url, username, password); Statement stmt = con.createStatement(); String s1 ="select * from userandpwd where username='" + jT1.getText().trim() +"' and pwd='"+jP1.getText().trim()+"'"; ResultSet rs = stmt.executeQuery(s1); if (!rs.next()) jT2.setText("该用户不存在"); else if(!jP2.getText().trim().equals(jP3.getText().trim())) jT2.setText("密码不对"); else { s1="update userandpwd set pwd='"+jP2.getText().trim()+ "' where username='"+jT1.getText().trim()+"'"; stmt.executeUpdate(s1); jT2.setText("密码修改成功"); } }catch(Exception e1){ e1.printStackTrace(); } } void jButton2_actionPerformed(ActionEvent e) { System.exit(0); } } class Frame1_jButton1_actionAdapter implements java.awt.event.ActionListener { Frame1 adaptee; Frame1_jButton1_actionAdapter(Frame1 adaptee) { this.adaptee = adaptee; } public void actionPerformed(ActionEvent e) { adaptee.jButton1_actionPerformed(e); } } class Frame1_jButton2_actionAdapter implements java.awt.event.ActionListener { Frame1 adaptee; Frame1_jButton2_actionAdapter(Frame1 adaptee) { this.adaptee = adaptee; } public void actionPerformed(ActionEvent e) { adaptee.jButton2_actionPerformed(e); } }