import?java.rmi.*;
import?java.io.*;
import?javax.naming.*;
/**
?*?Class?Client?implentents?menu?model.
?*?
?*?@version?1.0??9?June?2008?
?*?@author?jack
?*/
public?class?Client{
	
	/**?
	?*??Define?a?general?variable?to?mark?the?error?state
	?*??and?according?to?the?error?state?to?return?
	?*??corresponding?hint?message.?
	?*/
	private?static?int?flag?=?0;
	
	public?static?void?main（String[]?args）{
		Client?c?=?new?Client（）;
		c.run（args）;
	}
	
	/**
	?*	Implement?the?client-end?menu?for?user?to?select.?
	?*/
	void?run（String[]?args）{
		try{
			/**
			?*?This?interface?represents?a?naming?context?which?consists?of?a
			?*?set?of?name-to-object?bindings.
			?*/
			Context?nc?=?new?InitialContext（）;

			/**?Declare?a?RMIIntf?object?and?assign?it?to?null?*/
			RMIIntf?r1?=?null;

			//?If?the?parameter?number?is?not?enough?exit?the?program.
			if?（args.length?!=?2）?{
				System.out
						.println（“\nYou?must?input?remote?host?ip?address?and?port?number!“）;
				System.exit（0）;
			}
			try?{
				//?Retrieves?the?named?object.
				r1?=?（RMIIntf）?nc.lookup（“rmi://“?+?args[0]?+?“:“?+?args[1]
						+?“/RemoteService“）;
			}?catch?（NumberFormatException?nfe）?{
				System.out.println（“\nInput?Parameter?Format?Error!“）;
				System.exit（0）;
			}
			
			BufferedReader?rd?=?new?BufferedReader（new?InputStreamReader（
					System.in））;

			/**?Loop?to?display?the?main?menu.?*/
			while?（true）?{
				//?Display?the?menu?item?and?hint?for?input.
				System.out
						.println（“1.User?Register.\n2.Show?Users.\n3.Check?Message.\n4.Leave?Message.\n5.User?Exit“）;
				System.out.print（“Please?Input?Your?choice?>?“）;

				/**?Read?in?choice.?*/
				String?choice?=?rd.readLine（）;
				/**?Declare?the?function?parameters?used?below.?*/
				String?u?p?r?mt;

				if?（isCorrectNumber（choice））?{

					//?Parse?the?choice?to?int.
					int?c?=?Integer.parseInt（choice）;

					//?According?to?user‘s?choice?enter?different?branchs
					switch?（c）?{
					
						case?1:
							System.out.print（“Please?Input?username?>>?“）;
							u?=?rd.readLine（）;
							while（u.equals（““））{
								System.out.println（“Username?Can‘t?be?null?Please?Input?Again!“）;
								System.out.print（“Please?Input?username?>>?“）;
								u?=?rd.readLine（）;
								
							}
							System.out.print（“Please?Input?password?>>?“）;
							p?=?rd.readLine（）;
							while（p.equals（““））{
								System.out.println（“Password?Can‘t?be?null?Please?Input?Again!“）;
								System.out.print（“Please?Input?password?>>?“）;
								p?=?rd.readLine（）;	
							}
							System.out.println（r1.register（u?p））;
							break;
							
						case?2:	
							System.out.println（r1.showusers（））;
							break;
							
						case?3:
							System.out.print（“Please?Input?username?>>?“）;
							u?=?rd.readLine（）;
							while（u.equals（““））{
								System.out.println（“Username?Can‘t?be?null?Please?Input?Again!“）;
								System.out.print（“P

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????5954??2008-06-17?16:19??exam2\Client.java

?????文件????????673??2008-06-17?16:19??exam2\MessageCenter.java

?????文件???????1927??2008-06-17?16:19??exam2\MessageContent.java

?????文件????????606??2008-06-17?16:19??exam2\README.txt

?????文件???????4697??2008-06-17?16:19??exam2\RMIImpl.java

?????文件????????706??2008-06-17?16:18??exam2\RMIIntf.java

?????目錄??????????0??2008-06-17?16:17??exam2

-----------?---------??----------?-----??----

????????????????14563????????????????????7