loginmidlet.java

<j2me 开发精解> 詹建光著 里所有的源码。对J2me的开发相当有帮助

package com.j2medev.chapter4;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class LoginMIDlet extends MIDlet implements CommandListener {
    
    private Display display;
    private Form loginForm;
    private Form successForm;
    private TextField userName;
    private TextField password;
    private ChoiceGroup autoLogin;
    private Model model;
    public static final Command connCommand = new Command("登录", Command.OK, 1);
    public static final Command exitCommand = new Command("退出",Command.EXIT,2);
    
    protected void startApp() {
        initMIDlet();
        Account account = model.getAccount(1);
        if (account == null || !account.isAutoLogin()) {
            display.setCurrent(loginForm);
        } else if (account.isAutoLogin()) {
            //读取RMS中的用户和密码与服务器端校验，这里省略。
            display.setCurrent(successForm);
        }
    }
    
    public void initMIDlet() {
        model = new Model();
        display = Display.getDisplay(this);
        loginForm = new Form("用户登录");
        userName = new TextField("用户名：", null, 20, TextField.ANY);
        password = new TextField("密码：", null, 20, TextField.PASSWORD);
        autoLogin = new ChoiceGroup("设置", Choice.MULTIPLE,
                new String[] { "自动登录" }, null);
        loginForm.append(userName);
        loginForm.append(password);
        loginForm.append(autoLogin);
        loginForm.addCommand(connCommand);
        loginForm.addCommand(exitCommand);
        loginForm.setCommandListener(this);
        successForm = new Form("登录成功");
        successForm.addCommand(exitCommand);
        successForm.setCommandListener(this);
        successForm.append("您已经成功连接到服务器！");
    }
    
    protected void pauseApp() {   
    }
    
    protected void destroyApp(boolean arg0) {
        model.closeRecordStore();
    }
    
    public void commandAction(Command cmd, Displayable displayable) {
        String _userName;
        String _password;
        boolean auto = false;
        
        if (cmd == connCommand) {
            _userName = userName.getString();
            _password = password.getString();
            auto = autoLogin.isSelected(0);
            if (auto) {
                Account account = new Account(_userName, _password, auto);
                model.saveAccount(account);
            }
            display.setCurrent(successForm);
        }else if(cmd == exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }
    }
    
}