mainmidlet.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 java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.util.Vector;

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

import rms.*;

/**
 * 主程序入口MIDlet
 * 一些公用变量、过程
 * @author hong
 *
 */
public class MainMidlet extends MIDlet {

	//rms表名
	final public static String RMS_BREED="breed";
	final public static String RMS_PAGE="page";
	final public static String RMS_MENU="menu";
	final public static String RMS_TASTE="taste";
	final public static String RMS_SYSINFO="sysinfo";
	final public static String RMS_BACKREASON="backReason";

	//全局变量
	public static String PDAID="";
	public static String posID="";
	public static String posName="";
	public static String areaID="";
	public static String areaName="";
	public static String serverLink="";
	
	public static String glbUserID;
	public static String glbUserNo;
	public static String glbUserName;
	public static boolean islogin=false;
	
	public static Vector menus=new Vector();

	public MainMidlet() {
		Navigator.display=Display.getDisplay(this);
		Navigator.midlet=this;
		init();
	}

	protected void startApp() throws MIDletStateChangeException {
		Navigator.current=Navigator.LOGIN_SCREEN;
	//	Navigator.current=Navigator.ADDMENU_SCREEN;
		Navigator.show(null);
	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}
	
	//获取本地初始化信息
	private void init(){
		RecordEnumeration re;
		RecordStore rs;
		rs = RMSUtil.openRSAnymay(RMS_SYSINFO);
		if (rs != null) {
			try {
				re = rs.enumerateRecords(null, null, false);
				if (re.hasNextElement()) {
				byte[] data=re.nextRecord();
				ByteArrayInputStream byteInStream = new ByteArrayInputStream(data);
				DataInputStream inStream = new DataInputStream(byteInStream);
				PDAID=inStream.readUTF();
				inStream.close();
				byteInStream.close();
				}
				rs.closeRecordStore();
				
				GetDataThread t = new GetDataThread();
				t.init(GetDataThread.rt_PDA);
				t.start();
			} catch (Exception e) {
				System.out.println(e.toString());
				e.printStackTrace();
			}
		}
		rs = RMSUtil.openRSAnymay(RMS_MENU);
		if (rs != null) {
			try {
				re = rs.enumerateRecords(null, null, false);
				menus.removeAllElements();
				while (re.hasNextElement()) {
					byte[] data = re.nextRecord();
					menus.addElement(Menu.decode(data));
				}
				rs.closeRecordStore();
			} catch (Exception e) {
				System.out.println(e.toString());
				e.printStackTrace();
			}
			sortMenus(menus);
		}
	}

	/**
	 * 根据输入字符串和指定分隔符进行分隔
	 * 
	 * @param inputStr
	 * @return 分割后的字符串数组
	 */
	public static String[] splitString(String inputStr, char split) {
		Vector tmp = new Vector();
		int beginIndex = 0, endIndex;
	
		try {
			endIndex = inputStr.indexOf(split, beginIndex);
			boolean over = false;
			while (!over) {
				if (endIndex == -1)
					endIndex = inputStr.length();
				tmp.addElement(inputStr.substring(beginIndex, endIndex));
				beginIndex = endIndex + 1;
				if (beginIndex < inputStr.length())
					endIndex = inputStr.indexOf(split, beginIndex);
				else
					over = true;
			}
			if (inputStr.endsWith(String.valueOf(split)))
				tmp.addElement("");
	
			String[] result = new String[tmp.size()];
			for (int i = 0; i < tmp.size(); i++)
				result[i] = tmp.elementAt(i).toString();
			return result;
		} catch (Exception e) {
			System.out.println("数据转换发生错误:" + inputStr);
			return null;
		}
		
	}
	
	/**
	 * 返回指定长度的字符串（后面补空，或截断）
	 */
	public static String getLenStr(String inputStr,int len){
		if (inputStr.length()>=len){
			return inputStr.substring(0,len);
		}
		else{
			char[] result=new char[len];
			for (int i=0;i<len;i++){
				if (i<inputStr.length())
					result[i]=inputStr.charAt(i);
				else
					result[i]=' ';
			}
			return String.valueOf(result);
		}
	
	}
	
	/**
	 * 按编号排列菜品
	 * @param menus
	 */
	public static void sortMenus(Vector menus){
		Menu menu_a,menu_b;
		for (int i=0;i<menus.size();i++)
			for (int j=i;j<menus.size();j++){
				menu_a=(Menu)(menus.elementAt(i));
				menu_b=(Menu)(menus.elementAt(j));
				if (Integer.parseInt(menu_a.getMenuId())>
				  Integer.parseInt(menu_b.getMenuId())){
					menus.setElementAt(menu_b,i);
					menus.setElementAt(menu_a,j);
				}
			}
	}
	
	/**
	 * 获得某一类的菜品列表
	 * @param breedID 菜品类别
	 * @return 某一类的菜品列表
	 */
	public static Vector getMenusByBreed(String breedID){
		Vector result=new Vector();
		Menu aMenu;
		for (int i=0;i<menus.size();i++){
			aMenu=(Menu)(menus.elementAt(i));
			if (aMenu.getBreedId().equals(breedID))
				result.addElement(menus.elementAt(i));
		}
        return result;	
	}
	
	public static Menu getMenu(String menuID){
		Menu aMenu, selectMenu = null;
		for (int i = 0; i < MainMidlet.menus.size(); i++) {
			aMenu = (Menu) (MainMidlet.menus.elementAt(i));
			if (aMenu.getMenuId().equals(menuID)) {
				selectMenu = aMenu;
				break;
			}
		}
		return selectMenu;
	}

}