请教一个简单的数据交互问题

GUI没有用过，在网上找GUI：简称 图形用户接口，以前做验证码都是根据输入 的和 生成的验证码(放作用域中) 做对比，

我写了一个简单的，保存到一个xml文件中，你可以根据需要根据上面的回帖改动。
GUI界面程序：
package client;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import bean.EmailInfo;

public class ClientFrame extends JFrame {
   
    private JLabel emailNameLbl;
    private JLabel passwordLbl;
    private JLabel rePasswordLbl;
    private JLabel serverLbl;
    private JTextField emailNameTxt;
    private JPasswordField passwordTxt;
    private JPasswordField rePasswordTxt;
    private JButton submitBtn;
    private JButton cancleBtn;
    private JButton exitBtn;
   
    public ClientFrame() {
        super("邮箱注册");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        initGUI();
        addListeners();
        pack();
        centerWindow(this);
    }
   
    private void initGUI() {

        JPanel namePnl = new JPanel();
        namePnl.setLayout(new FlowLayout(FlowLayout.LEFT));
        emailNameLbl = new JLabel("邮箱名 ：    ");
        emailNameTxt = new JTextField(20);
        serverLbl = new JLabel("@);
        namePnl.add(emailNameLbl);
        namePnl.add(emailNameTxt);
        namePnl.add(serverLbl);
        
        JPanel passwordPnl = new JPanel();
        passwordPnl.setLayout(new FlowLayout(FlowLayout.LEFT));
        passwordLbl = new JLabel("密码：         ");
        passwordTxt = new JPasswordField(10);
        passwordPnl.add(passwordLbl);
        passwordPnl.add(passwordTxt);
        
        JPanel rePasswordPnl = new JPanel();
        rePasswordPnl.setLayout(new FlowLayout(FlowLayout.LEFT));
        rePasswordLbl = new JLabel("密码确认：");
        rePasswordTxt = new JPasswordField(10);
        rePasswordPnl.add(rePasswordLbl);
        rePasswordPnl.add(rePasswordTxt);
        
        JPanel mainContentPnl = new JPanel();
        mainContentPnl.setLayout(new BoxLayout(mainContentPnl, BoxLayout.Y_AXIS ));
        mainContentPnl.add(namePnl);
        mainContentPnl.add(passwordPnl);
        mainContentPnl.add(rePasswordPnl);
        
        JPanel buttonPnl = new JPanel();
        buttonPnl.setLayout(new FlowLayout(FlowLayout.RIGHT));
        submitBtn = new JButton();
        cancleBtn = new JButton("取消");
        exitBtn = new JButton("退出");
        buttonPnl.add(submitBtn);
        buttonPnl.add(cancleBtn);
        buttonPnl.add(exitBtn);
        
        Container c = getContentPane();
        c.add(mainContentPnl, BorderLayout.CENTER);
        c.add(buttonPnl, BorderLayout.PAGE_END);
        
    }
   
    private void addListeners() {
        submitBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                EmailInfo info = new EmailInfo();
                info.setEmailName(emailNameTxt.getText() + "test@.com");
                info.setPassword(new String(passwordTxt.getPassword()));
                info.setRePassword(new String(rePasswordTxt.getPassword()));
                MyAction action = new MyAction(info);
                action.actionPerformed(e);
                if (action.getIsSaveSuc())
                {
                    emailNameTxt.setText("");
                    passwordTxt.setText("");
                    rePasswordTxt.setText("");
                }
            }
        });
        submitBtn.setText("提交");
        cancleBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                emailNameTxt.setText("");
                passwordTxt.setText("");
                rePasswordTxt.setText("");
            }
        });
        exitBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                System.exit(0);
            }
        });

    }
   
    private void centerWindow(Window w)
    {
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension windowSize = w.getSize();
        int x = (screenSize.width - windowSize.width) / 2;
        int y = (screenSize.height - windowSize.height) / 2;
        w.setLocation(new Point(x, y));
    }
   
    public static void main(String[] args) {
        new ClientFrame().setVisible(true);
    }

}
保存邮箱信息的bean：
package bean;

public class EmailInfo {

    private String emailName;
    private String password;
    private String rePassword;

    public EmailInfo() {
    }

    public EmailInfo(String emailName, String password, String rePassword) {
        this.emailName = emailName;
        this.password = password;
        this.rePassword = rePassword;
    }

    public String getEmailName() {
        return emailName;
    }

    public void setEmailName(String emailName) {
        this.emailName = emailName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getRePassword() {
        return rePassword;
    }

    public void setRePassword(String rePassword) {
        this.rePassword = rePassword;
    }

}

校验和保存的逻辑：
package client;

import java.awt.event.ActionEvent;
import java.beans.XMLEncoder;
import
import
import
import
import

import javax.swing.AbstractAction;
import javax.swing.JOptionPane;

import bean.EmailInfo;

public class MyAction extends AbstractAction {

    private EmailInfo info;
    private String path = "c:/info.xml";
    private boolean isSaveSuc = false;
   
    public MyAction(EmailInfo info) {
        this.info = info;
    }
    @Override
    public void actionPerformed(ActionEvent event) {
        if (validateInfo())
        {
            saveAsXml();
            JOptionPane.showMessageDialog(null, "保存成功。");
            isSaveSuc = true;
        }

    }
   
    public boolean getIsSaveSuc()
    {
        return isSaveSuc;
    }
   
    private boolean validateInfo()
    {
        String name = info.getEmailName();
        if (name == null || name.trim().length() == 0)
        {
            JOptionPane.showMessageDialog(null, "邮箱名不能为空");
            return false;
        }
        String password = info.getPassword();
        String rePassword = info.getRePassword();
        if (password == null || password.trim().length() == 0)
        {
            JOptionPane.showMessageDialog(null, "密码不能为空");
            return false;
        }
        else if (!password.equals(rePassword))
        {
            JOptionPane.showMessageDialog(null, "两次输入密码不同，请重新输入。");
            return false;
        }
        
        return true;
        
    }
   
    /**
     * 将一个JavaBean存储为一个XML格式的文件
     */
    private void saveAsXml()
    {
        try {
            //添加参数true,每次只是追加在文件的末尾
            OutputStream out = new FileOutputStream(path, true);
            XMLEncoder e = new XMLEncoder(new BufferedOutputStream(out));
            e.writeObject(info);
            e.close();
            out.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
            JOptionPane.showMessageDialog(null, "保存失败.");
        } catch (IOException e) {
            e.printStackTrace();
            JOptionPane.showMessageDialog(null, "保存失败.");
        }
        
    }

}
运行效果：



[ 本帖最后由 baifenghan 于 2010-5-22 02:07 编辑 ]