userconf.java

用面向对象语言Java写的局域网中C/S架构的聊天器

import java.awt.*;
import javax.swing.border.*;
import java.net.*;
import javax.swing.*;
import java.awt.event.*;

/**
 * 生成用户信息输入对话框的类
 * 让用户输入自己的用户名
 */
public class UserConf extends JDialog {
	JPanel panelUserConf = new JPanel();
	JButton save = new JButton();
	JButton cancel = new JButton();
	JLabel DLGINFO=new JLabel(
		"                         默认用户名为：匆匆过客");

	JPanel panelSave = new JPanel();
	JLabel message = new JLabel();
	String userInputName;

	JTextField userName ;

	public UserConf(JFrame frame,String str) {
		super(frame, true);
		this.userInputName = str;
		try {
			jbInit();
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		//设置运行位置，使对话框居中
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		this.setLocation( (int) (screenSize.width - 400) / 2 + 50,
						(int) (screenSize.height - 600) / 2 + 150);
		this.setResizable(false);
	}

	private void jbInit() throws Exception {
		this.setSize(new Dimension(300, 120));
		this.setTitle("用户设置");
		message.setText("请输入用户名:");
		userName = new JTextField(10);
		userName.setText(userInputName);
		save.setText("保存");
		cancel.setText("取消");

		panelUserConf.setLayout(new FlowLayout());
		panelUserConf.add(message);
		panelUserConf.add(userName);

		panelSave.add(new Label("              "));
		panelSave.add(save);
		panelSave.add(cancel);
		panelSave.add(new Label("              "));

		Container contentPane = getContentPane();
		contentPane.setLayout(new BorderLayout());
		contentPane.add(panelUserConf, BorderLayout.NORTH);
		contentPane.add(DLGINFO, BorderLayout.CENTER);
		contentPane.add(panelSave, BorderLayout.SOUTH);

		//保存按钮的事件处理
		save.addActionListener(
			new ActionListener() {
				public void actionPerformed (ActionEvent a) {
					if(userName.getText().equals("")){
						DLGINFO.setText(
							"                                 用户名不能为空！");
						userName.setText(userInputName);
						return;
					}
					else if(userName.getText().length() > 15){
						DLGINFO.setText("                    用户名长度不能大于15个字符！");
						userName.setText(userInputName);
						return;
					}
					userInputName = userName.getText();
					dispose();
				}
			}
		);

		//关闭对话框时的操作
		this.addWindowListener(
			new WindowAdapter(){
				public void windowClosing(WindowEvent e){
					DLGINFO.setText("                         默认用户名为：匆匆过客");
				}
			}
		);

		//取消按钮的事件处理
		cancel.addActionListener(
			new ActionListener(){
				public void actionPerformed(ActionEvent e){
					DLGINFO.setText("                         默认用户名为：匆匆过客");
					dispose();
				}
			}
		);
	}
}