一个登陆界面
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一个登陆界面，
我知道的界面设计有2种，一种为纯代码设计的，一种为GUI窗体设计的。
本人认为用GUI窗体设计比较简单方便。
本文以图书馆管理系统为例，介绍图书馆管理系统的登陆界面。
先用GUI设计如图界面：
生成代码自动如下：
/* * To change this template, choose Tools | Templates * and open the template in the editor. */package com.derun.iframe;//import com.derun.dao.User;//import com.derun.dao.UserDAO;//import com.derun.xuejava.Library;//import javax.swing.JOptionPane;/** * * @author Administrator */public class LoginJFrame extends javax.swing.JFrame { /** * Creates new form LoginJFrame */ public LoginJFrame() { 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. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); password = new javax.swing.JPasswordField(); username = new javax.swing.JTextField(); jLabel1 = new javax.swing.JLabel(); jPanel2 = new javax.swing.JPanel(); btn_login = new javax.swing.JButton(); btn_reset = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jPanel1.setPreferredSize(new java.awt.Dimension(279, 150)); jLabel2.setText("用户名："); jLabel3.setText("密 码："); username.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { usernameActionPerformed(evt); } }); jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/login.jpg"))); // NOI18N jLabel1.setPreferredSize(new java.awt.Dimension(200, 60)); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(33, 33, 33) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(jLabel2) .addComponent(jLabel3)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(username, javax.swing.GroupLayout.DEFAULT_SIZE, 148, Short.MAX_VALUE) .addComponent(password)) .addContainerGap()) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() .addGap(0, 0, Short.MAX_VALUE) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 279, javax.swing.GroupLayout.PREFERRED_SIZE)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 76, Short.MAX_VALUE) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(username, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel2)) .addGap(18, 18, 18) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel3) .addComponent(password, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(44, 44, 44)) ); getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER); jPanel2.setPreferredSize(new java.awt.Dimension(277, 60)); btn_login.setText("登陆"); btn_login.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btn_loginActionPerformed(evt); } }); btn_reset.setText("重置"); btn_reset.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btn_resetActionPerformed(evt); } }); javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); jPanel2.setLayout(jPanel2Layout); jPanel2Layout.setHorizontalGroup( jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel2Layout.createSequentialGroup() .addContainerGap(68, Short.MAX_VALUE) .addComponent(btn_login) .addGap(42, 42, 42) .addComponent(btn_reset) .addGap(55, 55, 55)) ); jPanel2Layout.setVerticalGroup( jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel2Layout.createSequentialGroup() .addContainerGap() .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(btn_login) .addComponent(btn_reset)) .addContainerGap(27, Short.MAX_VALUE)) ); getContentPane().add(jPanel2, java.awt.BorderLayout.PAGE_END); pack(); }// </editor-fold> /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new LoginJFrame().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton btn_login; private javax.swing.JButton btn_reset; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JPanel jPanel1; private javax.swing.JPanel jPanel2; private javax.swing.JPasswordField password; private javax.swing.JTextField username; // End of variables declaration }然后双击重置按钮：可以对此按钮进行编程：
private void btn_resetActionPerformed(java.awt.event.ActionEvent evt) { //用户单击了“重置”按钮，则清空用户名和密码文本框 username.setText(""); password.setText(""); }
而对于登陆按钮 如果是普通的不用连接数据库的设计同样先双击“登陆”按钮出现编程代码地方：private void btn_loginActionPerformed(java.awt.event.ActionEvent evt) { String user_name = username.getText().trim(); String pass_word = new String(password.getPassword());if ('admin'.equals(user_name)&&'123456'.equals(pass_word)) { Library ly = new Library(); ly.setVisible(true); this.setVisible(false); } }
如果是连接数据库，首先实现好数据库部分，然后可以用DAO作为连接实现。0 0
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