numberonly.java

struts+hibernate做的一个用户注册管理系统

package com.user.util;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;

import javax.swing.AbstractAction;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.text.Keymap;

public class NumberOnly extends JTextField implements KeyListener,
		MouseWheelListener {
	double stepSize = 1;

	Toolkit toolkit = Toolkit.getDefaultToolkit();

	public NumberOnly() {
		Keymap keymap = getKeymap();
		keymap.addActionForKeyStroke(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0),
				new AbstractAction() {
					public void actionPerformed(ActionEvent e) {
						nextStep();
					}
				});
		keymap.addActionForKeyStroke(KeyStroke
				.getKeyStroke(KeyEvent.VK_DOWN, 0), new AbstractAction() {
			public void actionPerformed(ActionEvent e) {
				previousStep();
			}
		});
		addKeyListener(this);
		addMouseWheelListener(this);
		setHorizontalAlignment(RIGHT);
	}

	public void paste() {
		// Ctrl-V not allowed here to prevent illegal inputs.
	}

	public void keyTyped(KeyEvent e) {
		char keyChar = e.getKeyChar();
		if ((keyChar >= '0' && keyChar <= '9') // Digits
				|| (keyChar == '-' && getCaretPosition() == 0 && getText()
						.indexOf("-") == -1) // Sign
				|| (keyChar == '.' && getText().indexOf(".") == -1) // Radix
																	// point
				|| (keyChar == '\b') // Backspace
		) {
			return;
		}

		toolkit.beep();
		e.consume(); // Stop the illegal inputs from being added to the text
						// field.
	}

	public void keyPressed(KeyEvent e) {
	}

	public void keyReleased(KeyEvent e) {
	}

	public void mouseWheelMoved(MouseWheelEvent e) {
		if (e.getWheelRotation() < 0) {
			nextStep();
		} else {
			previousStep();
		}
	}

	public double getStepSize() {
		return stepSize;
	}

	public void setStepSize(double s) {
		stepSize = s;
	}

	public void nextStep() {
		try {
			double value = getDouble();
			String newText = String.valueOf(value + stepSize);
			setText(((int) value == value) ? newText.substring(0, newText
					.indexOf(".")) : newText);
		} catch (NumberFormatException e) {
		}
	}

	public void previousStep() {
		try {
			double value = getDouble();
			String newText = String.valueOf(value - stepSize);
			setText(((int) value == value) ? newText.substring(0, newText
					.indexOf(".")) : newText);
		} catch (NumberFormatException e) {
		}
	}

	public double getDouble() throws NumberFormatException {
		return Double.parseDouble(getText());
	}

	public float getFloat() throws NumberFormatException {
		return Float.parseFloat(getText());
	}

	public int getInt() throws NumberFormatException {
		return Integer.parseInt(getText());
	}

	public long getLong() throws NumberFormatException {
		return Long.parseLong(getText());
	}
}