J2ME实现的通讯录程式

     本程序主要利用在J2ME MIDP的RMS功能，演示了 如何通过 RecordStore 对象进行存储数据 ,并实现一个通讯录程序，程序的主要代码如下：

AddressBook.java 的源代码如下：

java 代码

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;


public class AddressBook extends MIDlet implements CommandListener
{
	private Display display=null;
	Command search=null;
	Command quit=null;
	Command delete=null;
	Command addnow=null;	
	Command edit=null;
	Command mainmenu=null;
	
	List menu=null;
	Form ui_form=null;
	StringItem si=null;
	TextField name=null;
	TextField phone=null;
	TextField nameForEdit=null;
	
	RecordStore recordStore=null;//声明记录储存
	
	public AddressBook()
	{
		display=Display.getDisplay(this);  //定义Display变量
		quit=new Command("关闭",Command.SCREEN,3);//定义关闭按钮
		search=new Command("查找",Command.SCREEN,2);//定义查询按钮
		delete=new Command("删除",Command.SCREEN,2);//定义删除按钮
		addnow=new Command("增加",Command.SCREEN,2);//定义增加按钮
		edit=new Command("修改",Command.SCREEN,2);//定义修改按钮
		mainmenu=new Command("主菜单",Command.SCREEN,2);//定义主菜单按钮
	        //记录储存初始化
		try 
		{
			recordStore=RecordStore.openRecordStore("address",true);
		}
		catch(RecordStoreException rse)
		{
			rse.printStackTrace();
		}
	}
	public void startApp()
	{
		menu=new List("电话薄...",List.IMPLICIT);
		menu.append("1.查询",null);
		menu.append("2.增加",null);
		menu.append("3.删除",null);
		menu.append("4.修改",null);
		menu.append("5.关闭",null);
		menu.setCommandListener(this);
		display.setCurrent(menu);
		}
	void searchScreen()  //查询用户界面
	{
		ui_form=new Form("电话薄查询");
		 name=new TextField("查询姓名","",50,0);
		ui_form.append(name);
		
		ui_form.addCommand(search);
		ui_form.addCommand(quit);
		
		ui_form.setCommandListener(this);
		
		display.setCurrent(ui_form);
	}
    void addScreen()
    {
    	ui_form=new Form("添加");
		
    	name=new TextField("姓名","",50,0);
		ui_form.append(name);
		
		phone=new TextField("电话号码","",50,0);
		ui_form.append(phone);
		
		ui_form.addCommand(addnow);
		ui_form.addCommand(quit);
		
		ui_form.setCommandListener(this);
		
		display.setCurrent(ui_form);
    }
    void editScreen()
    {
    	ui_form=new Form("修改");
		
    	nameForEdit=new TextField("需要修改的姓名","",50,0);
		ui_form.append(nameForEdit);
		
		name=new TextField("姓名","",50,0);
		ui_form.append(name);
		
		phone=new TextField("电话号码","",50,0);
		ui_form.append(phone);
				
		ui_form.addCommand(edit);
		ui_form.addCommand(quit);
		
		ui_form.setCommandListener(this);
		
		display.setCurrent(ui_form);
    }
    void deleteScreen()
    {
    	ui_form=new Form("删除");
		
    			
		name=new TextField("姓名","",50,0);
		ui_form.append(name);
		
						
		ui_form.addCommand(delete);
		ui_form.addCommand(quit);
		
		ui_form.setCommandListener(this);
		
		display.setCurrent(ui_form);
    }
public void pauseApp()
{
	menu=null;
}
public void destroyApp(boolean unconditional)
{
	menu=null;
	notifyDestroyed();
}
public void commandAction(Command c,Displayable d)
{
	if(c==quit)
	{
		try
		{
			close();
		}
	
		catch(RecordStoreException rse)
		{
			rse.printStackTrace();
		}
		destroyApp(true);
		}

else if(c==search)
{
	String temp_search=name.getString();
	address_search(temp_search);
	
}
else if(c==edit)
{
	String temp_nameForEdit=nameForEdit.getString();
	String temp_name=name.getString();
	String temp_phone=phone.getString();
	address_edit(temp_nameForEdit,temp_name,temp_phone);
	}
else if(c==mainmenu)
{
	startApp();
}
else if (c==delete)
{
	String temp_delete=name.getString();
	address_del(temp_delete);
}
else if(c==addnow)
{
	String temp_name=name.getString();
	String temp_phone=phone.getString();
	address_add(temp_name,temp_phone);
}
else   //其他事件，根据list选项调用个界面
{
	List down=(List)display.getCurrent();
	switch(down.getSelectedIndex())
	{
	case 0: searchScreen();break;
	case 1: addScreen();break;
	case 2: deleteScreen();break;
	case 3: editScreen();break;
	case 4: destroyApp(true);break;
	}
}
}
void address_search(String address)
{
	String temp=" ";
	String phone_number;
	String person_name;
	String check_name="";
	int size=address.length();
	try
	{
		RecordEnumeration re=
			recordStore.enumerateRecords(null,null,false); //enumeration通过项目集允许对例程进行重复调用。
	    ui_form=new Form("查询结果");
		while(re.hasNextElement())
		{
			String name1=new String(re.nextRecord());
			try
			{
				person_name=name1.substring(0,name1.indexOf("?"));
			}
			catch(Exception ef)
			{
				person_name="请检查姓名是否正确";
				ef.printStackTrace();
			}
			if(person_name.length()>=size)
			{
				check_name=person_name.substring(0,size);
				
			}
			if(check_name.equals(address))
			{
				try{
					phone_number=name1.substring(name1.indexOf("?")+1);
					}
				catch(Exception e)
				{
					phone_number="";
				}
		temp=temp+"\n姓名.."+person_name+"\n电话.."+phone_number;
		}
		}
	//}

if(temp.equals(" "))
{
	temp="没有找到......";
}
ui_form.append(temp);

ui_form.addCommand(quit);
ui_form.addCommand(mainmenu);
ui_form.setCommandListener(this);
display.setCurrent(ui_form);
//}
	}
catch(RecordStoreNotOpenException rsnoe)
{
	rsnoe.printStackTrace();
}
catch(InvalidRecordIDException irid)
{
	irid.printStackTrace();
	}
catch(RecordStoreException rse)
{
	rse.printStackTrace();
}
} 
void address_del(String address)
{
	String temp=" ";
	String phone_number;
	String person_name;
	int id;
	int del_id=0;
	try
	{   RecordEnumeration re=
		recordStore.enumerateRecords(null,null,false);
	    ui_form=new Form("删除结果");
	while(re.hasNextElement())
	{
		id=re.nextRecordId();
		String name1=new String(recordStore.getRecord(id));
		try
		{
			person_name=name1.substring(0,name1.indexOf("?")); //搜索截取特定的字符串
		}
		catch(Exception ef)
		{
			person_name="请检查姓名是否正确";
			ef.printStackTrace();
		}
		if(person_name.equals(address))
		{
			del_id=id;
		}
	}
	if(del_id!=0)
	{
		recordStore.deleteRecord(del_id);
		temp="成功地删除一条记录";
		}
	else
	{
		temp="所指定的记录不在电话薄内";
	}
}
	catch(Exception e)
	{
	}
	ui_form.append(temp);
	
	ui_form.addCommand(quit);
	ui_form.addCommand(mainmenu);
	
	ui_form.setCommandListener(this);
	
	display.setCurrent(ui_form);
	}
 void address_add(String address,String phone)
 {
 	String data=address+"?"+phone;
 	System.out.println(data);
 	try
	{
 		byte[] b=data.getBytes();
 		recordStore.addRecord(b,0,b.length);
 		ui_form=new Form("添加成功");
 		ui_form.append("成功地添加一条记录");
 		
 		ui_form.addCommand(quit);
 		ui_form.addCommand(mainmenu);
 		
 		ui_form.setCommandListener(this);
 		
 		display.setCurrent(ui_form);
	}
 	catch(RecordStoreException rse)
	{
 		rse.printStackTrace();
	}
 }
 	void address_edit(String addressForEdit,String address,String phone)
 	{
 		int id=1;
 		int edit_id=0;
 		String person_name;
 		String temp="error";
 		try
		{
		RecordEnumeration re=
			recordStore.enumerateRecords(null,null,false);
		    ui_form=new Form("修改");
		while(re.hasNextElement())
		{
			id=re.nextRecordId();
			String name1=new String(recordStore.getRecord(id));
			try
			{
				person_name=name1.substring(0,name1.indexOf("?"));
			}
			catch(Exception ef)
			{
				person_name="请检查姓名是否正确";
			}
			if(person_name.equals(addressForEdit))
			{
				edit_id=id;
			}
		}
		if(edit_id!=0)
		{
			String data=address+"?"+phone;
			byte[] b_data=data.getBytes();
			recordStore.setRecord(edit_id,b_data,0,b_data.length);
			temp="成功地修改一条记录";
			}
		else
		{
			temp="要修改的记录不在电话薄内";
		}
 	    }
		catch(Exception e)
		{
		e.printStackTrace();
		}
		ui_form.append(temp);
 		
 		ui_form.addCommand(quit);
 		ui_form.addCommand(mainmenu);
 		
 		ui_form.setCommandListener(this);
 		display.setCurrent(ui_form);
 	}
    //关闭记录储存
    public void close()throws RecordStoreNotOpenException,RecordStoreException
   {
	recordStore.closeRecordStore();
    }
 }