loginframe.java

用JAVA+ACCESS实现的VIP商场消费管理系统

package shop;//
//以下是布局GUI的类
//
import java.sql.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 class LoginFrame extends JFrame 
{
   private Connection loginconnection;
   private Statement loginstatement; 	
   private ResultSet loginresultSet; 
   JTextField userNameTextField;
   private JPasswordField passwordField;
   public LoginFrame() 
   {
	setTitle("登录窗口");
    	setSize(250,150);
      	setResizable(false);
      	addWindowListener(new WindowAdapter() 
      	{
        	public void windowClosing(WindowEvent e) 
        	{
            	System.exit(0);
        	}
      	});
      	setLocation(350,200);
      	GridBagLayout layout = new GridBagLayout();
        Container contents = getContentPane();
        contents.setLayout(layout);
        GridBagConstraints constraints = new GridBagConstraints();
        userNameTextField = new JTextField(); //needed below
        userNameTextField.setPreferredSize(new Dimension(120, 25));
        JLabel userNameLabel = new JLabel();
        userNameLabel.setLabelFor(userNameTextField);
        userNameLabel.setText("用户名");
        constraints.weightx = 100;
        constraints.weighty = 100;
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        contents.add(userNameLabel, constraints);        
        constraints.gridx = 1;
        constraints.gridy = 0;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        contents.add(userNameTextField, constraints);       
        passwordField = new JPasswordField(); // needed below
        passwordField.setPreferredSize(new Dimension(120, 25));
        // password label
        JLabel passwordLabel = new JLabel();       
        passwordLabel.setText("口  令");
        passwordLabel.setLabelFor(passwordField);
        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        contents.add(passwordLabel, constraints);
        // password field   
        constraints.gridx = 1;
        constraints.gridy = 1;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        contents.add(passwordField, constraints);       
        JPanel buttonPanel = createButtonPanel(); // sets global loginButton
        constraints.gridx = 0;
        constraints.gridy = 2;
        constraints.gridwidth = 3;
        constraints.gridheight = 1;
        contents.add(buttonPanel, constraints);
   }
  private void equalizeComponentSizes(java.util.List components) 
     {
        // Get the largest width and height
        int i = 0;
        Dimension maxPreferred = new Dimension(0,0);
        JComponent oneComponent = null;
        Dimension thisPreferred = null;
        for (i = 0; i < components.size(); ++i) {
            oneComponent = (JComponent)components.get(i);
            thisPreferred = oneComponent.getPreferredSize();
            maxPreferred.width =
                Math.max(maxPreferred.width, (int)thisPreferred.getWidth());
            maxPreferred.height =
                Math.max(maxPreferred.height, (int)thisPreferred.getHeight());
        }
        // reset preferred and maximum size since BoxLayout takes both
        // into account
        for (i = 0; i < components.size(); ++i) {
            oneComponent = (JComponent)components.get(i);
            oneComponent.setPreferredSize((Dimension)maxPreferred.clone());
            oneComponent.setMaximumSize((Dimension)maxPreferred.clone());
        }
    } // equalizeComponentSizes()
  private void initAboutDialog()
     {
		JDialog dialog = new About(this,true);
        dialog.show();      
     }
  /*private void connection()
  {
	String url = "jdbc:odbc:VipQuery"; 
  	String username = ""; 
  	String password = "";
  	
  	//加载驱动程序以连接数据库
    	try 
    	{ 
      	Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" ); 
      	loginconnection = DriverManager.getConnection( url, username, password ); 
    	} 
    	//捕获加载驱动程序异常
    	catch ( ClassNotFoundException cnfex ) 
    	{ 
      	System.err.println("装载 JDBC/ODBC 驱动程序失败。" ); 
      	cnfex.printStackTrace(); 
       	System.exit( 1 );  // terminate program 
    	} 
    	//捕获连接数据库异常
    	catch ( SQLException sqlex ) 
    	{ 
       	System.err.println( "无法连接数据库" ); 
       	sqlex.printStackTrace(); 
       	System.exit( 1 );  // terminate program 
    	}       
  }
  private void loginOperate() 
  {
	   try
	   {
	    String loginquery,loginpassword="";
		String loginusename = userNameTextField.getText();
		char a[]=passwordField.getPassword(); 
		int n=a.length;
		for(int j=0;j<n;j++)
		{
			loginpassword+=a[j];
		} 
   	loginquery = "select * from UESR_MANAGER where ( username ='"+loginusename+
   	"'and password = '"+loginpassword+"')";					  
   	loginstatement = loginconnection.createStatement(); 
   	loginresultSet = loginstatement.executeQuery(loginquery ); 
   	boolean Records = loginresultSet.next();
   	if ( ! Records ) 
 		{ 
 			//弹出消息框
   	JOptionPane.showMessageDialog( this,"登录失败" );
		//清空文本框，等待用户的再次输入
		userNameTextField.setText("");
		passwordField.setText("");
   		return; 
 		} 
 		else
 		{
 			MainFrame f = new MainFrame();
    		f.show();
    		dispose();				
 		}
 		loginconnection.close();
  }
  catch(SQLException sqlex)
	{
		sqlex.printStackTrace();
	} 
  }
  */
  private JPanel createButtonPanel() 
  {
      JPanel panel = new JPanel();
      panel.setLayout(new BoxLayout(panel, 0));
      // login button (global variable)
      JButton loginButton=new JButton();
      loginButton = new JButton();
      loginButton.setText("确  定");
      loginButton.addActionListener(new ActionListener() 
      {
          public void actionPerformed(ActionEvent event) 
          {	
       	   	//connection();
               //loginOperate();
        	  String loginpassworda="";
      		char a[]=passwordField.getPassword(); 
      		int n=a.length;
      		for(int j=0;j<n;j++)
      		{
      			loginpassworda+=a[j];
      		} 
       		if(userNameTextField.getText().replace('a','w').equals("wyl")&&loginpassworda.equals("123")
       			||userNameTextField.getText().replace('a','s').equals("hust")&&loginpassworda.equals("hust")
       			||userNameTextField.getText().replace('b','a').equals("a")&&loginpassworda.equals("a")
       			||userNameTextField.getText().replace('b','a').equals("aaa")&&loginpassworda.equals("abc"))
       		{
               MainFrame f = new MainFrame();
        		f.show();
       		}
       		else
       		{
    		//清空文本框，等待用户的再次输入
    		userNameTextField.setText("请重新输入");
    		passwordField.setText("");
     		} 
          }//actionPerformed            
      }//actionlistener
      );
      panel.add(loginButton);
      // space
      panel.add(Box.createRigidArea(new Dimension(5,0)));
      // cancel button
      JButton cancelButton = new JButton();
      cancelButton.setText("取  消");
      cancelButton.addActionListener(new ActionListener() 
      {
          public void actionPerformed(ActionEvent event) 
          {
              dispose();
              System.exit(0);
          }
      });
      panel.add(cancelButton);
      // space
      panel.add(Box.createRigidArea(new Dimension(5,0)));
      // help button
      JButton helpButton = new JButton();
      helpButton.setText("About");
      helpButton.addActionListener(new ActionListener() 
      {
          public void actionPerformed(ActionEvent event) 
          {
              initAboutDialog();
          }
      });
      panel.add(helpButton);
      Vector buttons = new Vector(3);
      buttons.add(cancelButton);
      buttons.add(helpButton);
      buttons.add(loginButton);
      equalizeComponentSizes(buttons);
      buttons.removeAllElements(); // simplify gc
      return panel;
  } // createButtonPanel()      
}