logindialog.java

一个用Java写的简单学生成绩管理系统

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.sql.*;


/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class LoginDialog    extends JDialog
{
    public String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
    public String source = "jdbc:odbc:srs";
    private static String stuid;
    private String stupwd;
    JPanel panel = new JPanel();
    JLabel jlid = new JLabel();
    JLabel jlpwd = new JLabel();
    JTextField jtfid = new JTextField();
    JPasswordField jpfpwd = new JPasswordField();
    JButton jbok = new JButton();
    JButton jbreg = new JButton();
    BorderLayout borderLayout1 = new BorderLayout();
    JLabel jLabel1 = new JLabel();
    JLabel jLabel2 = new JLabel();
    JComboBox jchoose = new JComboBox();
    private int choose = 0;

  public LoginDialog()
  {

    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  private void jbInit() throws Exception
  {
    panel.setLayout(null);
    this.getContentPane().setLayout(borderLayout1);
    this.setTitle("学生注册系统登录");
    //this.setVisible(false);
    this.setSize(320,250);
    this.setResizable(false);

    jlid.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
    jlid.setForeground(Color.black);
    jlid.setText("学号");
    jlid.setBounds(new Rectangle(51, 33, 56, 16));
    jlpwd.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
    jlpwd.setForeground(Color.black);
    jlpwd.setText("密码");
    jlpwd.setBounds(new Rectangle(54, 72, 63, 16));
    jtfid.setText("33060423");
    jtfid.setBounds(new Rectangle(137, 29, 120, 22));
    jpfpwd.setText("33060423");
    jpfpwd.setBounds(new Rectangle(138, 69, 118, 22));
    jbok.setBounds(new Rectangle(59, 151, 73, 26));
    jbok.setFont(new java.awt.Font("Dialog", Font.BOLD, 13));
    jbok.setText("登录");
    jbok.addActionListener(new LoginDialog_jbok_actionAdapter(this));
    jbreg.setBounds(new Rectangle(189, 150, 73, 26));
    jbreg.setFont(new java.awt.Font("Dialog", Font.BOLD, 13));
    jbreg.setText("注册");
    jbreg.addActionListener(new LoginDialog_jbreg_actionAdapter(this));
    jLabel1.setFont(new java.awt.Font("Dialog",Font.PLAIN,16));
    jLabel1.setForeground(Color.blue);
    jLabel1.setText("如果您是第一次登录，请先注册");
    jLabel1.setBounds(new Rectangle(52, 194, 247, 16));
    jLabel2.setFont(new java.awt.Font("Dialog", Font.PLAIN, 16));
    jLabel2.setForeground(Color.red);
    jLabel2.setText("登录方式 ");
    jLabel2.setBounds(new Rectangle(44, 112, 73, 16));
    jchoose.setBounds(new Rectangle(138, 110, 118, 17));
    jchoose.addItem("学生登录");
    jchoose.addItem("管理员登录");
    jchoose.addItemListener(new LoginDialog_jchoose_itemAdapter(this));
    panel.add(jpfpwd, null);
    panel.add(jLabel2);
    panel.add(jbreg, null);
    panel.add(jbok, null);
    panel.add(jLabel1);
    panel.add(jchoose);
    panel.add(jtfid, null);
    panel.add(jlid, null);
    panel.add(jlpwd, null);
    panel.add(jlid, null);
    this.getContentPane().add(panel, java.awt.BorderLayout.CENTER);
    this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    this.getRootPane().setDefaultButton(jbok);
  }

  public void jbok_actionPerformed(ActionEvent e)
  {
    char []p;
    stuid = jtfid.getText().trim();
    p = jpfpwd.getPassword();
    stupwd = new String(p);
    //System.out.println(stupwd);
    try
    {
      Class.forName(driver);
    }
    catch(ClassNotFoundException ex)
    {
      JOptionPane.showMessageDialog(this,"没有发现驱动程序"+driver,"Error",1);
      ex.printStackTrace();
      System.exit(1);
    }
    try
    {
      Connection connection = DriverManager.getConnection(source);
      SQLWarning warn = connection.getWarnings();
      while (warn != null)
      {
        JOptionPane.showMessageDialog(this,warn.getMessage(),"ERROR",1);
        warn = warn.getNextWarning();
      }
      String stusql = "select * from Student where id = '"+stuid+"'";
      String adminsql = "select * from admin where id = '"+stuid+"'";
      //PreparedStatement pstm = connection.prepareStatement(sql);
      Statement stm = connection.createStatement();
      ResultSet rs;
      System.out.println(choose);
      if(choose ==1 )
      {
        System.out.println(adminsql);
        rs = stm.executeQuery(adminsql);
      }
      else
      {
        System.out.println(stusql);
        rs = stm.executeQuery(stusql);
      }
      //System.out.println(rs);
      while (rs.next())
      {
        String stupwdtemp = rs.getString("password");
        //System.out.println(stupwdtemp+"test");
        if ( !stupwdtemp.equals( stupwd) )
        {
          JOptionPane.showConfirmDialog(this,"密码错误，请重新输入","ERROR",JOptionPane.ERROR_MESSAGE,JOptionPane.OK_OPTION);
        }
        else
        {
          if(choose == 1)
          {
            Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
            EditCourse editframe = new EditCourse();
            editframe.setLocation( (screenSize.width -
                                    editframe.getSize().width) / 2,
                                  (screenSize.height -
                                   editframe.getSize().height) / 2);
            editframe.setVisible(true);
            this.dispose();
          }
          else
          {
            Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
            MainFrame mainframe = new MainFrame();
            mainframe.setLocation( (screenSize.width -
                                    mainframe.getSize().width) / 2,
                                  (screenSize.height -
                                   mainframe.getSize().height) / 2);
            mainframe.setVisible(true);
            this.dispose();
          }
        }
      }
      rs.close();
      stm.close();
      connection.close();
    }
    catch(Exception ex)
    {
      JOptionPane.showMessageDialog(this,"在执行数据库访问时出现错误!","Error",1);
      //ex.printStackTrace();
      ex.printStackTrace();
      System.exit(1);
    }

  }

  public void jbreg_actionPerformed(ActionEvent e)
  {
      Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      RegFrame reg = new RegFrame();
      //reg.setLocation(300,200);
      reg.setLocation( (screenSize.width - reg.getSize().width)/2,
          (screenSize.height - reg.getSize().height)/2);
  reg.setVisible(true);
  //this.dispose();
 }
 public static String getID()
 {
   return stuid;
 }


  public void jchoose_itemStateChanged(ItemEvent e) {
    int b;
    b = jchoose.getSelectedIndex();
    choose = b;
    if ( b==1)
    {
      jlid.setText("管理员");
      jtfid.setText("admin");
      jpfpwd.setText("");
    }
    else
    {
      jlid.setText("学号");
      jtfid.setText("33060423");
    }
  }
}

class LoginDialog_jchoose_itemAdapter
    implements ItemListener {
  private LoginDialog adaptee;
  LoginDialog_jchoose_itemAdapter(LoginDialog adaptee) {
    this.adaptee = adaptee;
  }

  public void itemStateChanged(ItemEvent e) {
    adaptee.jchoose_itemStateChanged(e);
  }
}


class LoginDialog_jbreg_actionAdapter
    implements ActionListener {
  private LoginDialog adaptee;
  LoginDialog_jbreg_actionAdapter(LoginDialog adaptee) {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e) {
    adaptee.jbreg_actionPerformed(e);
  }
}

class LoginDialog_jbok_actionAdapter
    implements ActionListener {
  private LoginDialog adaptee;
  LoginDialog_jbok_actionAdapter(LoginDialog adaptee) {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e) {
    adaptee.jbok_actionPerformed(e);
  }
}