jdialogdemo.java

一个让初学者更好了解Java图形界面各种组件的使用方法的程序。java swing 组件

//JDialogDemo.java
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class JDialogDemo implements ActionListener {
	JFrame f = null;
	
	public JDialogDemo() {
		f = new JFrame("JDialogDemo");
		Container contentPane = f.getContentPane();
		JPanel buttonPanel = new JPanel();
		JButton b = new JButton("借用物品");
		b.addActionListener(this);
		buttonPanel.add(b);
		b = new JButton("离开系统");
		b.addActionListener(this);
		buttonPanel.add(b);

		// 设置边框
		buttonPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory
				.createLineBorder(Color.blue, 2), "借用物品系统",
				TitledBorder.CENTER, TitledBorder.TOP));
		contentPane.add(buttonPanel, BorderLayout.CENTER);
		f.pack();
		f.setVisible(true);
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}

	public void actionPerformed(ActionEvent e) {
		String cmd = e.getActionCommand();
		if (cmd.equals("借用物品")) {
			new LendingSystem(f);
		} else if (cmd.equals("离开系统")) {
			System.exit(0);
		}
	}

	public static void main(String[] args) {
		SwingUtil.setLookAndFeel();
		new JDialogDemo();
	}
}

class LendingSystem implements ActionListener {
	JTextField staffField, objectField, borrowDateField, returnDateField,
			reasonField;
	JDialog dialog;

	LendingSystem(JFrame f) {
		dialog = new JDialog(f, "借用物品", true);
		GridBagConstraints c;
		int gridx, gridy, gridwidth, gridheight, 
		    anchor, fill, ipadx, ipady;
		double weightx, weighty;
		Insets inset;

		GridBagLayout gridbag = new GridBagLayout();
		Container dialogPane = dialog.getContentPane();
		dialogPane.setLayout(gridbag);

		JLabel label = new JLabel("员工编号 : ");
		gridx = 0; //第0列
		gridy = 0; //第0行
		gridwidth = 1; //占一单位宽度
		gridheight = 1; //占一单位高度
		weightx = 0; //窗口增大时组件宽度增大比率0
		weighty = 0; //窗口增大时组件高度增大比率0
		anchor = GridBagConstraints.CENTER; //容器大于组件size时将组件置于容器中央
		fill = GridBagConstraints.BOTH; //窗口拉大时会填满水平与垂直空间
		inset = new Insets(0, 0, 0, 0); //组件间间距
		ipadx = 0; //组件内水平宽度
		ipady = 0; //组件内垂直高度
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(label, c);
		dialogPane.add(label);

		label = new JLabel("借用器具 : ");
		gridx = 3;
		gridy = 0;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(label, c);
		dialogPane.add(label);

		label = new JLabel("借用日期: ");
		gridx = 0;
		gridy = 1;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(label, c);
		dialogPane.add(label);

		label = new JLabel("归还日期: ");
		gridx = 3;
		gridy = 1;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(label, c);
		dialogPane.add(label);

		label = new JLabel("借用原因 : ");
		gridx = 0;
		gridy = 2;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(label, c);
		dialogPane.add(label);

		staffField = new JTextField();
		gridx = 1;
		gridy = 0;
		gridwidth = 2;
		gridheight = 1;
		weightx = 1;
		weighty = 0;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(staffField, c);
		dialogPane.add(staffField);

		objectField = new JTextField();
		gridx = 4;
		gridy = 0;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(objectField, c);
		dialogPane.add(objectField);

		borrowDateField = new JTextField();
		gridx = 1;
		gridy = 1;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(borrowDateField, c);
		dialogPane.add(borrowDateField);

		returnDateField = new JTextField();
		gridx = 4;
		gridy = 1;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(returnDateField, c);
		dialogPane.add(returnDateField);

		reasonField = new JTextField();
		gridx = 1;
		gridy = 2;
		gridwidth = 5;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(reasonField, c);
		dialogPane.add(reasonField);

		JPanel panel = new JPanel();
		panel.setLayout(new GridLayout(1, 2));
		JButton b = new JButton("确定");
		panel.add(b);
		b = new JButton("取消");
		b.addActionListener(this);
		panel.add(b);

		gridx = 0;
		gridy = 3;
		gridwidth = 6;
		weightx = 1;
		weighty = 1;
		c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
				weightx, weighty, anchor, fill, inset, ipadx, ipady);
		gridbag.setConstraints(panel, c);
		dialogPane.add(panel);

		dialog.setBounds(200, 150, 400, 130);
		dialog.show();
	}
	
	public void actionPerformed(ActionEvent e) {
		String cmd = e.getActionCommand();
		if (cmd.equals("确定")) {
			// 这里可以添加你要处理的动作
			// 比如将数据保存到数据库等

		} else if (cmd.equals("取消")) {
			dialog.dispose();
		}
	}

}

class SwingUtil {
	public static final void setLookAndFeel() {
		try {
			Font font = new Font("JFrame", Font.PLAIN, 12);
			Enumeration keys = UIManager.getLookAndFeelDefaults().keys();
            // 将所有字体都设置为font对象中定义的字体
			while (keys.hasMoreElements()) {
				Object key = keys.nextElement();
				if (UIManager.get(key) instanceof Font) {
					UIManager.put(key, font);
				}
			}
			// Windows风格的界面
			UIManager.setLookAndFeel
			    ("com.sun.java.java.swing.plaf.windows.WindowsLookAndFeel");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}