connectdlg.java

编了一个简单的聊天器

//ConnectDlg.java
package chatclient;

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

public class ConnectDlg extends JDialog implements PropertyChangeListener {
	JTextField serverAddrField;
	JTextField userNameField;
	JOptionPane optionPane;
	String serverAddr, userName;
	int value = -1;
	public ConnectDlg(Frame frame) {
		super(frame, "连接", true);
		serverAddrField = new JTextField(15);
		userNameField = new JTextField(20);
		Object[] array =
			{ "服务器地址:", serverAddrField, "用户名:", userNameField };
		optionPane =
			new JOptionPane(
				array,
				JOptionPane.QUESTION_MESSAGE,
				JOptionPane.OK_CANCEL_OPTION);
		setContentPane(optionPane);

		optionPane.addPropertyChangeListener(this);
		setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent we) {
				setVisible(false);
			}
		});
	}
	public void propertyChange(PropertyChangeEvent e) {
		String prop = e.getPropertyName();
		if (isVisible()
			&& (e.getSource() == optionPane)
			&& (JOptionPane.VALUE_PROPERTY.equals(prop)
				|| JOptionPane.INPUT_VALUE_PROPERTY.equals(prop))) {
			if (optionPane.getValue() == JOptionPane.UNINITIALIZED_VALUE) {
				//ignore reset
				return;
			}
			value = ((Integer) optionPane.getValue()).intValue();
			optionPane.setValue(JOptionPane.UNINITIALIZED_VALUE);

			if (value == JOptionPane.OK_OPTION) {
				if ("".equals(serverAddrField.getText())
					|| "".equals(userNameField.getText())) {
					JOptionPane.showMessageDialog(
						this,
						"请输入服务器地址或用户名");
					if("".equals(serverAddrField.getText())){
						serverAddrField.requestFocus();
					}else if("".equals(userNameField.getText())){
						userNameField.requestFocus();
					}
				} else {
					setServerAddr(serverAddrField.getText());
					setUserName(userNameField.getText());
					setVisible(false);
				}
			} else {
				setVisible(false);
			}
		}
	}
	public String getServerAddr() {
		return serverAddr;
	}

	public String getUserName() {
		return userName;
	}
	public void setServerAddr(String host) {
		this.serverAddr = host;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public int getValue() {
		return value;
	}

}