findaccount.java

希望这个对大家有用

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

public class FindAccount extends JInternalFrame implements ActionListener {

	private JPanel jpFind = new JPanel();
	private JLabel lbNo, lbName, lbDate, lbBal;
	private JTextField txtNo, txtName, txtDate, txtBal;
	private JButton btnFind, btnCancel;

	private int count = 0;
	private int rows = 0;
	private	int total = 0;

	//String Type Array use to Load Records From File.
	private String records[][] = new String [500][6];

	private FileInputStream fis;
	private DataInputStream dis;

	FindAccount () {

		//super(Title, Resizable, Closable, Maximizable, Iconifiable)
		super ("Search Customer [By No.]", false, true, false, true);
		setSize (350, 235);

		jpFind.setLayout (null);

		lbNo = new JLabel ("Account No:");
		lbNo.setForeground (Color.black);
		lbNo.setBounds (15, 20, 80, 25);
	        lbName = new JLabel ("Person Name:");
		lbName.setForeground (Color.black);
	        lbName.setBounds (15, 55, 80, 25);
		lbDate = new JLabel ("Last Transaction:");
		lbDate.setForeground (Color.black);
		lbDate.setBounds (15, 90, 100, 25);
		lbBal = new JLabel ("Balance:");
		lbBal.setForeground (Color.black);
		lbBal.setBounds (15, 125, 80, 25);

		txtNo = new JTextField ();
		txtNo.setHorizontalAlignment (JTextField.RIGHT);
		txtNo.setBounds (125, 20, 200, 25);
		txtName = new JTextField ();
		txtName.setEnabled (false);
		txtName.setBounds (125, 55, 200, 25);
		txtDate = new JTextField ();
		txtDate.setEnabled (false);
		txtDate.setBounds (125, 90, 200, 25);
		txtBal = new JTextField ();
		txtBal.setHorizontalAlignment (JTextField.RIGHT);
		txtBal.setEnabled (false);
		txtBal.setBounds (125, 125, 200, 25);

		//Restricting The User Input to only Numerics.
		txtNo.addKeyListener (new KeyAdapter() {
			public void keyTyped (KeyEvent ke) {
				char c = ke.getKeyChar ();
				if (!((Character.isDigit (c) || (c == KeyEvent.VK_BACK_SPACE)))) {
					getToolkit().beep ();
					ke.consume ();
      				}
    			}
  		}
		);

		//Aligning The Buttons.
		btnFind = new JButton ("Search");
		btnFind.setBounds (20, 165, 120, 25);
		btnFind.addActionListener (this);
		btnCancel = new JButton ("Cancel");
		btnCancel.setBounds (200, 165, 120, 25);
		btnCancel.addActionListener (this);

		//Adding the All the Controls to Panel.
		jpFind.add (lbNo);
		jpFind.add (txtNo);
		jpFind.add (lbName);
		jpFind.add (txtName);
		jpFind.add (lbDate);
		jpFind.add (txtDate);
		jpFind.add (lbBal);
		jpFind.add (txtBal);
		jpFind.add (btnFind);
		jpFind.add (btnCancel);

		//Adding Panel to Window.
		getContentPane().add (jpFind);

		populateArray ();	//Load All Existing Records in Memory.

		//In the End Showing the New Account Window.
		setVisible (true);

	}

	//Function use By Buttons of Window to Perform Action as User Click Them.
	public void actionPerformed (ActionEvent ae) {

		Object obj = ae.getSource();

		if (obj == btnFind) {
			if (txtNo.getText().equals("")) {
				JOptionPane.showMessageDialog (this, "Please! Provide Id of Customer to Search.",
							"BankSystem - EmptyField", JOptionPane.PLAIN_MESSAGE);
				txtNo.requestFocus();
			}
			else {
				rows = 0;
				populateArray ();	//Load All Existing Records in Memory.
				findRec ();		//Finding if Account No. Exist or Not.
			}
		}
		if (obj == btnCancel) {
			txtClear ();
			setVisible (false);
			dispose();
		}

	}

	//Function use to load all Records from File when Application Execute.
	void populateArray () {

		try {
			fis = new FileInputStream ("Bank.dat");
			dis = new DataInputStream (fis);
			//Loop to Populate the Array.
			while (true) {
				for (int i = 0; i < 6; i++) {
					records[rows][i] = dis.readUTF ();
				}
				rows++;
			}
		}
		catch (Exception ex) {
			total = rows;
			if (total == 0) {
				JOptionPane.showMessageDialog (null, "Records File is Empty.\nEnter Records First to Display.",
							"BankSystem - EmptyFile", JOptionPane.PLAIN_MESSAGE);
				btnEnable ();
			}
			else {
				try {
					dis.close();
					fis.close();
				}
				catch (Exception exp) { }
			}
		}

	}

	//Function use to Find Record by Matching the Contents of Records Array with ID TextBox.
	void findRec () {

		boolean found = false;
		for (int x = 0; x < total; x++) {
			if (records[x][0].equals (txtNo.getText())) {
				found = true;
				showRec (x);
				break;
			}
		}
		if (found == false) {
			JOptionPane.showMessageDialog (this, "Account No. " + txtNo.getText () + " doesn't Exist.",
							"BankSystem - WrongNo", JOptionPane.PLAIN_MESSAGE);
			txtClear ();
		}

	}

	//Function which display Record from Array onto the Form.
	public void showRec (int intRec) {

		txtNo.setText (records[intRec][0]);
		txtName.setText (records[intRec][1]);
		txtDate.setText (records[intRec][2] + ", " + records[intRec][3] + ", " + records[intRec][4]);
		txtBal.setText (records[intRec][5]);

	}

	//Function use to Clear all TextFields of Window.
	void txtClear () {

		txtNo.setText ("");
		txtName.setText ("");
		txtDate.setText ("");
		txtBal.setText ("");
		txtNo.requestFocus ();

	}

	//Function use to Lock Controls of Window.
	void btnEnable () {

		txtNo.setEnabled (false);
		btnFind.setEnabled (false);

	}

}