loginscreen.java

PDA餐饮管理系统,在掌上电脑实现的,可以开台,点菜等多功能模块

package junwei;
import javax.microedition.lcdui.*;

/**
 * 登陆界面
 * @author hong
 *
 */
public class LoginScreen extends InputScreen implements CommandListener{

	private static Displayable instance;

	synchronized public static Displayable getInstance() {
		if (instance == null)
			instance = new LoginScreen();
		return instance;
	}
	private static TextField textUserID;
	private static TextField textPwd;

	private LoginScreen() {
		super("登录");
		
		textUserID = new TextField("请输入工号：", MainMidlet.glbUserNo, 10,
				TextField.NUMERIC);
		append(textUserID);
		textPwd = new TextField("请输入密码：", "", 10,
				TextField.NUMERIC|TextField.PASSWORD);
		append(textPwd);
		
		addCommand(new Command("确定", Command.OK, 1));
		addCommand(new Command("取消", Command.CANCEL, 1));
		setCommandListener(this);
	}
	
	public void commandAction(Command c, Displayable s) {
		String cmd = c.getLabel();
		if (cmd.equals("确定")) {
			if (textUserID.getString().equals("")) {
				showInfo("请输入工号！");
				return;
			}
			if (textPwd.getString().equals("")) {
				showInfo("请输入密码！");
				return;
			}
			GetDataThread t = new GetDataThread();
			t.init(GetDataThread.rt_login, "LoginServlet?userid="
					+ textUserID.getString() + "&pwd=" + textPwd.getString()
					+ "&PDAId=" + MainMidlet.PDAID);
			t.start();
		}

		Navigator.flow(cmd);
	}
}