managerlogon.java

java编写的与SQL数据连接的好例子~~功能很完善,可以做实训直接交

/*
 * ManagerLogOn.java
 *
 * Created on 2008年6月29日, 下午4:40
 */

package stuMS;
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
/**
 *
 * @author  Administrator
 */
public class ManagerLogOn extends javax.swing.JDialog {
    Image icon;
    String manager = null;
    String password = null;
    DigitDocumnet document;
    boolean isSucceedLogOn = false;

    /** Creates new form ManagerLogOn */
    public ManagerLogOn(java.awt.Frame parent, boolean modal) {        
        super(parent, modal);
        icon = Toolkit.getDefaultToolkit().getImage( "icon.gif");
        document = new DigitDocumnet();
        initComponents();
        this.setLocationRelativeTo(parent);
    }
    
    /** 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.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        managerText = new javax.swing.JTextField();
        PasswordField = new javax.swing.JPasswordField();
        jPanel2 = new javax.swing.JPanel();
        LogOnButton = new javax.swing.JButton();
        cancelButton = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setIconImage(icon);

        jLabel1.setText("用户名：");

        jLabel2.setText("密码：");

        managerText.setBackground(new java.awt.Color(0, 204, 153));

        PasswordField.setBackground(new java.awt.Color(0, 204, 102));
        PasswordField.setDocument(document);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(14, 14, 14)
                        .addComponent(jLabel2)))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(PasswordField)
                    .addComponent(managerText, javax.swing.GroupLayout.DEFAULT_SIZE, 117, Short.MAX_VALUE))
                .addContainerGap(20, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(managerText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 15, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(PasswordField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        PasswordField.requestFocus();

        LogOnButton.setText("登录");
        LogOnButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                LogOnButtonActionPerformed(evt);
            }
        });

        cancelButton.setText("取消");
        cancelButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cancelButtonActionPerformed(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()
                .addGap(36, 36, 36)
                .addComponent(LogOnButton)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(cancelButton)
                .addContainerGap(45, Short.MAX_VALUE))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(LogOnButton)
                    .addComponent(cancelButton))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void cancelButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cancelButtonActionPerformed
        // TODO add your handling code here:
        this.dispose();
}//GEN-LAST:event_cancelButtonActionPerformed

    private void LogOnButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_LogOnButtonActionPerformed
        // TODO add your handling code here:
        document.count = 1;
        UserBean user = new UserBean();
        String [][]userInfo = user.getAllStuInfo();
        int length = userInfo.length;
        int i = 0;
        manager = managerText.getText();
        password = String.valueOf(PasswordField.getPassword());
        while(i<length)
        {
            if(userInfo[i][1].equals(manager) && userInfo[i][2].equals(password)){
                isSucceedLogOn = true;
                break;
            }                
            i++;
        }        
        if(isSucceedLogOn){
            JOptionPane.showMessageDialog(null, "登录成功！");
            this.dispose();
        }             
        else
            JOptionPane.showMessageDialog(null, "登录失败:用户名或密码错误", "错误", JOptionPane.ERROR_MESSAGE);
    }//GEN-LAST:event_LogOnButtonActionPerformed
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                ManagerLogOn dialog = new ManagerLogOn(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.setVisible(true);
            }
        });
    }
    /**
     * 文档类型PlainDocumnet的一个实例，限制密码输入只能是数字或字符
     */
     class DigitDocumnet extends PlainDocument {
        int count = 1;
        public void insertString(int offset, String s, AttributeSet a) {
            char c = s.charAt(0);
            if ((c <= '9' && c >= '0' || c<='z' && c >= 'A') &&count <= 8) {
                try {
                    super.insertString(offset, s, a);
                    count++;
                } catch (BadLocationException e) {
                }
            }
        }

        public void remove(int offset, int length) {
            try {
                super.remove(offset, length);
                count--;
            } catch (BadLocationException e) {
            }
        } 
     } 
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton LogOnButton;
    private javax.swing.JPasswordField PasswordField;
    private javax.swing.JButton cancelButton;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JTextField managerText;
    // End of variables declaration//GEN-END:variables
    
}