一个纯JAVA ,API编写的简单学生管理系统,

/* * LoginFrame.java * * Created on __DATE__, __TIME__ */ package com.newer.ss.view; import javax.swing.JOptionPane; import com.newer.ss.bean.User; import com.newer.ss.dao.UserDAO; /** * * @author __USER__ */ public class LoginFrame extends javax.swing.JFrame { /** Creates new form LoginFrame */ public LoginFrame() { 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(); jTextField1 = new javax.swing.JTextField(); jPasswordField1 = new javax.swing.JPasswordField(); jButton1 = new javax.swing.JButton(); jButton2 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jLabel1.setText("\u7528\u6237\u540d\uff1a"); jLabel2.setText("\u5bc6 \u7801\uff1a"); jButton1.setText("\u786e\u5b9a"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jButton2.setText("\u53d6\u6d88"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout( getContentPane()); getContentPane().setLayout(layout); layout .setHorizontalGroup(layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout .createSequentialGroup() .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout .createSequentialGroup() .addGap( 68, 68, 68) .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup( layout .createSequentialGroup() .addComponent( jLabel2) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent( jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup( layout .createSequentialGroup() .addComponent( jLabel1) .addPreferredGap( javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent( jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 127, javax.swing.GroupLayout.PREFERRED_SIZE)))) .addGroup( layout .createSequentialGroup() .addGap( 95, 95, 95) .addComponent( jButton1) .addGap( 18, 18, 18) .addComponent( jButton2))) .addContainerGap(70, Short.MAX_VALUE))); layout .setVerticalGroup(layout .createParallelGroup( javax.swing.GroupLayout.Alignment.LEADING) .addGroup( layout .createSequentialGroup() .addGap(53, 53, 53) .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)) .addGap(26, 26, 26) .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel2) .addComponent( jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(28, 28, 28) .addGroup( layout .createParallelGroup( javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton1) .addComponent(jButton2)) .addContainerGap(31, Short.MAX_VALUE))); pack(); }// </editor-fold> //GEN-END:initComponents private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { String userName = this.jTextField1.getText(); String password = new String(this.jPasswordField1.getPassword()); User user = UserDAO.login(userName, password); if(user != null) { JOptionPane.showMessageDialog(this, "登录成功！"); } else { JOptionPane.showMessageDialog(this, "用户名或者密码错误！"); } } private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { System.exit(0); } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new LoginFrame().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.JPasswordField jPasswordField1; private javax.swing.JTextField jTextField1; // End of variables declaration//GEN-END:variables }