[Docx.vn] Xay Dung Chuong Trinh Chat Room Client-server Bang Socket Trong Java

TRNG I HC BCH KHOA

KHOA CNG NGH THNG TIN

B MN MNG V TRUYN THNG

N MN HC

LP TRNH MNG MY TNH

TI

S dng Socket trong Java xy dng chng trnh CHAT

Room theo m hnh Client-Server

GVHD : TRN H THY TIN

Sinh vin : Trn Anh Tun

Lp : 06T3

Nhm : 09B

Nng 2011

n Lp Trnh Mng GVHD : Trn H Thy Tin

Sinh Vin: Trn Anh Tun - Lp 06t3 2

MC LC

MC LC ............................................................................................................... 2

DANH MC HNH ................................................................................................. 3

TNG QUAN V TI ..................................................................................... 4 Chng 1. C S L THUYT .............................................................................................................. 5

1.1. Giao thc TCP/IP ......................................................................................................................... 5 1.1.1. Giao thc IP(Internet Protocol - Giao thc Lin mng) ....................................................... 5 1.1.2. Giao thc TCP(Transmission Control Protocol - "Giao thc iu khin truyn vn") ......... 7

1.2. M hnh Client/Server .................................................................................................................. 8 1.3. C ch Socket trong Java ........................................................................................................... 10

1.3.1. Khi qut v Socket............................................................................................................ 10 1.3.2. C ch Socket..................................................................................................................... 10 1.3.3. M hnh truyn tin socket................................................................................................... 11 1.3.4. Mt s hm c bn trong socket ......................................................................................... 14

Chng 2. THIT K V XY DNG H THNG ........................................................................... 17 2.1. Phn tch yu cu ........................................................................................................................ 17 2.2. Phn tch cc chc nng ............................................................................................................. 17 2.3. Thit k k chng trnh ............................................................................................................. 18

2.3.1. Thit k giao din ............................................................................................................... 18 2.3.2. Xy dng cc chc nng .................................................................................................... 19

Chng 3. TRIN KHAI V NH GI KT QU ........................................................................... 20 3.1. Mi trng trin khai ................................................................................................................. 20 3.2. Kt qu cc chc nng ca chng trnh .................................................................................... 20

KT LUN V HNG PHT TRIN ............................................................. 23 1. NHNG KT QU T C .......................................................................... 23

2. NHNG VN TN TI ................................................................................ 23

3. HNG PHT TRIN ....................................................................................... 23

PH LC .............................................................................................................. 24 1. CHNG TRNH SERVER: ............................................................................... 24

1.1. Chatserver class: .................................................................................. 24

1.2. serverSocket class: .............................................................................. 27

2. CHNG TRNH CLIENT ................................................................................. 30

2.1. Client class: ......................................................................................... 30

2.2. ClientLogin class: ................................................................................ 38

2.3. clientSocket ......................................................................................... 44

TI LIU THAM KHO ..................................................................................... 49



DANH MC HNH

Hnh 1: S TCP/IP ............................................................................................ 5 Hnh 2 : Cu trc Header ca IP ............................................................................ 7 Hnh 3 : Cu trc header cua TCP ......................................................................... 8 Hnh 4 : M hnh client/server ............................................................................... 9

Hnh 5 : Client gi yu cu kt ni ti Server ..................................................... 11 Hnh 6 : Server ng kt ni v tip tc lng nghe. ......................................... 11 Hnh 7 : M hnh truyn tin socket ..................................................................... 12 Hnh 8 : M hnh tng tc gia client/server qua socket TCP .......................... 13 Hnh 9 : V d v mt chng trnh socket TCP ............................................... 15 Hnh 10 : V d v mt chng trnh socket TCP .............................................. 16 Hnh 11: Giao din login .................................................................................... 18 Hnh 12: Giao din Chat room ............................................................................ 18 Hnh 13 : Kt ni li khi Server cha chy ........................................................ 20 Hnh 14 : Chy chng trnh server .................................................................... 20 Hnh 15 : Login thnh cng vo phng Chat....................................................... 21

Hnh 16 : Th nghim Chat private ..................................................................... 22 Hnh 17 : Hin th thng bo login v logout trn Server ................................... 22



TNG QUAN V TI

1. Bi cnh v l do thc hin ti Ngy nay, nhu cu v cng ngh thng tin trong i sng l a dng.

Vic m rng cc h thng truyn thng v ngy c nhiu my vi tnh kt ni vo mng Internet. Vi vic ng dng giao thc TCP/IP lm cho h thng mng ngy cng rng hn v pht trin vt bt. Vn an ninh, bo mt,l mt th mnh ca giao thc ny em li cho cng ngh truyn thng.

Bn cnh vic pht trin ca th in t bng nhiu dch v khc nhau(gmail, yahoo,MSM trong mng in thoi di ng), vic CHAT trc tuyn v gi flie trc tip trn Internet cng l nhu cu khng th thiu.

Vi thc t nh vy, nhm chng em nghin cu v xy dng m hnh CHAT v truyn file trong mng LAN.

2. Phng php trin khai ti Ngn ng lp trnh : Java

Chng trnh son tho v build : NetBeans IDE

S dng Giao thc TCP/IP S dng Socket trong Java

3. Kt cu ca n Gm ba chng: Chng 1: C s l thuyt Chng 2: Thit k v xy dng h thng Chng 3: Trin khai v nh gi kt qu



Chng 1. C S L THUYT

1.1. Giao thc TCP/IP TCP/IP l tn chung cho mt tp hp hn 100 giao thc c s dng

kt ni cc my tnh vo mng, trong hai giao thc chnh l TCP (Transmission Control Protocol) v IP (Internet Protocol).

Trong phm vi Internet, thng tin khng c truyn ti nh mt dng ring bit t my tnh ny ti my tnh khc. Thay vo , d liu c chia thnh nhng gi nh gi l packet.

Cc packet ny c gi trn mng my tnh. Cng vic ca IP l chuyn chng n cc my tnh xa. Ti trm cui, TCP nhn cc packet v kim tra li. Nu mt li xut hin, TCP yu cu gi ring bit phi c gi li. Ch khi tt c cc packet nhn c l ng, TCP s s dng s th t to li thng tin ban u.

Hnh 1: S TCP/IP

1.1.1. Giao thc IP(Internet Protocol - Giao thc Lin mng)

L mt giao thc hng d liu c s dng bi cc my ch ngun v ch truyn d liu trong mt lin mng chuyn mch gi.

D liu trong mt lin mng IP c gi theo cc khi c gi l cc gi (packet hoc datagram). C th, IP khng cn thit lp cc ng truyn trc khi mt my ch gi cc gi tin cho mt my khc m trc n cha tng lin lc vi.

Giao thc IP cung cp mt dch v gi d liu khng m bo (cn gi l c gng cao nht), ngha l n hu nh khng m bo g v gi d liu.



Gi d liu c th n ni m khng cn nguyn vn, n c th n khng theo th t (so vi cc gi khc c gi gia hai my ngun v ch ), n c th b trng lp hoc b mt hon ton. Nu mt phn mm ng dng cn c bo m, n c th c cung cp t ni khc, thng t cc giao thc giao vn nm pha trn IP.

Cc thit b nh tuyn lin mng chuyn tip cc gi tin IP qua cc mng tng lin kt d liu c kt ni vi nhau. Vic khng c m bo v gi d liu c ngha rng cc chuyn mch gi c thit k n gin hn. (Lu rng nu mng b gi tin, lm i th t hoc lm hng nhiu gi tin, ngi dng s thy hot ng mng tr nn km i. Hu ht cc thnh phn ca mng u c gng trnh xy ra tnh trng . l l do giao thc ny cn c gi l c gng cao nht. Tuy nhin, khi li xy ra khng thng xuyn s khng c hiu qu xu n mc ngi dng nhn thy c.)

Giao thc IP rt thng dng trong mng Internet cng cng ngy nay. Giao thc tng mng thng dng nht ngy nay l IPv4; y l giao thc IP phin bn 4. IPv6 c ngh s k tip IPv4: Internet ang ht dn a ch IPv4, do IPv4 s dng 32 bit nh a ch (to c khong 4 t a ch); IPv6 dng a ch 128 bit, cung cp ti a khong 3.41038 a ch . Cc phin bn t 0 n 3 hoc b hn ch, hoc khng c s dng. Phin bn 5 c dng lm giao thc dng (stream) th nghim. Cn c cc phin bn khc, nhng chng thng dnh l cc giao thc th nghim v khng c s dng rng ri.

a ch IP c chia thnh 4 s gii hn t 0 - 255. Mi s c lu bi 1 byte - > IP c kch thc l 4byte, c chia thnh cc lp a ch. C 3 lp l A, B, v C. Nu lp A, ta s c th c 16 triu i ch, lp B c 65536 a ch. V d: lp B chng ta c tt c cc a ch t 132.25.0.0 n 132.25.255.255. Phn ln cc a ch lp A l s hu ca cc cng ty hay ca t chc. Mt ISP thng s hu mt vi a ch lp B hoc C. V d: Nu a ch IP ca bn l 132.25.23.24 th bn c th xc nh ISP ca bn l ai. (c IP l 132.25.x.)



Hnh 2 : Cu trc Header ca IP

1.1.2. Giao thc TCP(Transmission Control Protocol - "Giao thc iu khin

truyn vn")

L mt trong cc giao thc ct li ca b giao thc TCP/IP. S dng TCP, cc ng dng trn cc my ch c ni mng c th to cc "kt ni" vi nhau, m qua chng c th trao i d liu hoc cc gi tin. Giao thc ny m bo chuyn giao d liu ti ni nhn mt cch ng tin cy v ng th t. TCP cn phn bit gia d liu ca nhiu ng dng (chng hn, dch v Web v dch v th in t) ng thi chy trn cng mt my ch.

TCP h tr nhiu giao thc ng dng ph bin nht trn Internet v cc ng dng kt qu, trong c WWW, th in t v Secure Shell.

Trong b giao thc TCP/IP, TCP l tng trung gian gia giao thc IP bn di v mt ng dng bn trn. Cc ng dng thng cn cc kt ni ng tin cy kiu ng ng lin lc vi nhau, trong khi , giao thc IP khng cung cp nhng dng kiu , m ch cung cp dch v chuyn gi tin khng ng tin cy. TCP lm nhim v ca tng giao vn trong m hnh OSI n gin ca cc mng my tnh.

Cc ng dng gi cc dng gm cc byte 8-bit ti TCP chuyn qua mng. TCP phn chia dng byte ny thnh cc on (segment) c kch thc thch hp (thng c quyt nh da theo kch thc ca n v truyn dn ti a (MTU) ca tng lin kt d liu ca mng m my tnh ang nm trong ). Sau , TCP chuyn cc gi tin thu c ti giao thc IP gi n qua mt lin mng ti m un TCP ti my tnh ch. TCP kim tra m bo khng c gi tin no b tht lc bng cch gn cho mi gi tin mt "s th t" (sequence number). S th t ny cn c s dng m bo d liu c trao cho ng dng ch theo ng th t. M un TCP ti u kia gi li "tin



bo nhn" (acknowledgement) cho cc gi tin nhn c thnh cng; mt "ng h" (timer) ti ni gi s bo time-out nu khng nhn c tin bo nhn trong khong thi gian bng mt round-trip time (RTT), v d liu (c coi l b tht lc) s c gi li. TCP s dng checksum (gi tr kim tra) xem c byte no b hng trong qu trnh truyn hay khng; gi tr ny c tnh ton cho mi khi d liu ti ni gi trc khi n c gi, v c kim tra ti ni nhn.

Hnh 3 : Cu trc header cua TCP

1.2. M hnh Client/Server M hnh c ph bin nht v c chp nhn rng ri trong cc

h thng phn tn l m hnh client/server. Trong m hnh ny s c mt tp cc tin trnh m mi tin trnh ng vai tr nh l mt trnh qun l ti nguyn cho mt tp hp cc ti nguyn cho trc v mt tp hp cc tin trnh client trong mi tin trnh thc hin mt tc v no cn truy xut ti ti nguyn phn cng hoc phn mm dng chung. Bn thn cc trnh qun l ti nguyn cn phi truy xut ti cc ti nguyn dng chung c qun l bi mt tin trnh khc, v vy mt s tin trnh va l tin trnh client va l tin trnh server. Cc tin trnh pht ra cc yu cu ti cc server bt k khi no chng cn truy xut ti mt trong cc ti nguyn ca cc server. Nu yu cu l ng n th server s thc hin hnh ng c yu cu v gi mt p ng tr li ti tin trnh client.

M hnh client/server cung cp mt cch tip cn tng qut chia s ti nguyn trong cc h thng phn tn. M hnh ny c th c ci t bng rt nhiu mi trng phn cng v phn mm khc nhau. Cc my tnh c s dng chy cc tin trnh client/server c nhiu kiu khc nhau v khng cn thit phi phn bit gia chng; c tin trnh client v tin trnh server u c th chy trn cng mt my tnh. Mt tin trnh server c th s dng dch v ca mt server khc.

M hnh truyn tin client/server hng ti vic cung cp dch v. Qu trnh trao i d liu bao gm:

1. Truyn mt yu cu t tin trnh client ti tin trnh server



2. Yu cu c server x l 3. Truyn p ng cho client M hnh truyn tin ny lin quan n vic truyn hai thng ip v

mt dng ng b ha c th gia client v server. Tin trnh server phi nhn thc c thng ip c yu cu bc mt ngay khi n n v hnh ng pht ra yu cu trong client phi c tm dng (b phong ta) v buc tin trnh client trng thi ch cho t khi n nhn c p ng do server gi v bc ba.

M hnh client/server thng c ci t da trn cc thao tc c bn l gi (send) v nhn (receive)

Hnh 4 : M hnh client/server

Qu trnh giao tip client v server c th din ra theo mt trong hai ch : b phong ta (blocked) v khng b phong ta (non-blocked).

Ch b phong ta (blocked): Trong ch b phong ta, khi tin trnh client hoc server pht ra lnh

gi d liu (send), vic thc thi ca tin trnh s b tm ngng cho ti khi tin trnh nhn pht ra lnh nhn d liu (receive).

Tng t i vi tin trnh nhn d liu, nu tin trnh no (client hoc server) pht ra lnh nhn d liu, m ti thi im cha c d liu



gi ti th vic thc thi ca tin trnh cng s b tm ngng cho ti khi c d liu gi ti.

Ch khng b phong ta (non-blocked) Trong ch ny, khi tin trnh client hay server pht ra lnh gi d liu

thc s, vic thc thi ca tin trnh vn c tin hnh m khng quan tm n vic c tin trnh no pht ra lnh nhn d liu hay khng.

Tng t cho trng hp nhn d liu, khi tin trnh pht ra lnh nhn d liu, n s nhn d liu hin c, vic thc thi ca tin trnh vn c tin hnh m khng quan tm n vic c tin trnh no pht ra lnh gi d liu tip theo hay khng.

1.3. C ch Socket trong Java

1.3.1. Khi qut v Socket

Nh chng ta bit kt ni URLs v URL cung cp cho chng ta mt c cu truy xut vo cc ti nguyn trn Internet mt mc tng i cao, nhng i khi chng trnh ca chng ta li yu cu mt giao tip tng mng mc thp.V d khi chng ta vit mt ng dng client-server.

Trong mt ng dng client-server th pha server s cung cp mt s dch v, nh: x l c s d liu, cc yu cu bn pha client a ra, sau s gi li cho pha client. S giao tip nh vy gi l tin cy bi v d liu s khng b mt mt, sai lch trong qu trnh truyn, server gi cho client thng ip g th pha client s nhn c thng ip nguyn nh vy. Giao thc TCP s cung cp cho chng ta mt cch thc truyn tin cy. c th ni chuyn c trn TCP th chng trnh client v chng trnh server phi thip lp mt ng truyn, v mi chng trnh s phi kt ni li vi socket l im cui kt ni, client v server mun ni chuyn vi nhau th s phi thng qua socket, mi thng ip s phi i qua socket. Chng ta c mng tng socket y l mt ci ca mi ngi mun i ra hay i vo u phi thng qua ci ca ny.

1.3.2. C ch Socket

Mt socket l mt im cui ca thng tin hai chiu lin kt gia hai chng trnh ang chy trn mng. Nhng lp socket c dng i din cho kt ni gia mt chng trnh client v mt chng trnh server. Trong Java gi Java.net cung cp hai lp Socket v ServerSocket thc hin kt ni gia client v server.

Thng thng th server s chy trn mt my c bit v c mt socket gii hn trong 1 Portnumber c bit.

Pha client: client c bit hostname ca my m server ang chy v port number m server ang lng nghe. to mt yu cu kt ni client s



th hn gp server trn my ca server thng qua port number. Client cng cn xc nh chnh n vi server thng qua local port number.

Hnh 5 : Client gi yu cu kt ni ti Server

Nu mi th tt p th server s ng kt ni. khi ng kt ni th server s to ra mt socket mi ni chuyn vi client v cng to ra mt socket khc tip tc lng nghe.

Hnh 6 : Server ng kt ni v tip tc lng nghe.

1.3.3. M hnh truyn tin socket



Hnh 7 : M hnh truyn tin socket



Hnh 8 : M hnh tng tc gia client/server qua socket TCP

Mt socket c th thc hin by thao tc c bn: Kt ni vi mt my xa (v d, chun b gi v nhn d liu) Gi d liu Nhn d liu Ngt lin kt Gn cng Nghe d liu n Chp nhn lin kt t cc my xa trn cng c gn Lp Socket ca Java c s dng bi c client v server, c cc

phng thc tng ng vi bn thao tc u tin. Ba thao tc cui ch cn cho server ch cc client lin kt vi chng. Cc thao tc ny c ci t bi lp ServerSocket. Cc socket cho client thng c s dng theo m hnh sau:

Mt socket mi c to ra bng cch s dng hm Socket(). Socket c gng lin kt vi mt host xa.



Mi khi lin kt c thit lp, cc host xa nhn cc lung vo v lung ra t socket, v s dng cc lung ny gi d liu cho nhau. Kiu lin kt ny c gi l song cng (full-duplex)-cc host c th nhn v gi d liu ng thi. ngha ca d liu ph thuc vo giao thc.

Khi vic truyn d liu hon thnh, mt hoc c hai pha ngt lin kt. Mt s giao thc, nh HTTP, i hi mi lin kt phi b ng sau mi khi yu cu c phc v. Cc giao thc khc, chng hn FTP, cho php nhiu yu cu c x l trong mt lin kt n.

1.3.4. Mt s hm c bn trong socket

Class m t v socket - To mt socket Socket(InetAddress address, int port)

Socket(String host, int port)

Socket(InetAddress address, int port, InetAddress, localAddr, int

localPort)

Socket(String host, int port, InetAddress, localAddr, int localPort)

Socket()

- Ly thng tin v mt socket InetAddress getInetAddress() : tr v a ch m socket kt ni n int getPort() : tr v a ch m socket kt ni n. InetAddress getLocalAddress() : tr v a ch cc b. int getLocalPort() : tr v a ch cc b. - S dng Streams public OutputStream getOutputStream() throws IOException: Tr v

mt output stream cho vic vit cc byte n socket ny. public InputStream getInputStream() throws IOException : Tr v

mt input stream cho vic c cc byte t socket ny. ServerSocket class

- Class m t ServerSocket To mt ServerSocket ServerSocket(intport) throws IOException ServerSocket(intport,

intbacklog) throws IOException ServerSocket(intport, intbacklog,

InetAddressbindAddr) throws IOException

- Cc phng thc trong ServerSocket Socket accept() throws IOException: lng nghe mt kt ni n socket

ny v c chp nhn n hay khng void close() throws IOException: ngsocket.

InetAddress getInetAddress() : tr v a ch cc b ca socket int getLocalPort() : tr v port m server ang lng nghe



Hnh 9 : V d v mt chng trnh socket TCP



Hnh 10 : V d v mt chng trnh socket TCP



Chng 2. THIT K V XY DNG H

THNG

2.1. Phn tch yu cu - Yu cu ca bi ton: Xy dng m hnh Client Server ng dng

CHAT

- Xy dng chng trnh Server To mt TCP Socket v gn vo mt cng Xy dng mt chng trnh Server a tuyn (Threaded Server) cho

php nhiu Client kt ni ti Server.Mi tuyn m nhn lin lc vi Client. Ch v lng nghe yu cu kt ni t Client Chp nhn kt ni v nhn Socket tng ng. Truyn nhn thng tin qua cc lung nhn/gi d liu ca socket. Khi mt user login vo Server th Server s cp nht user v gi ti

cc Client ang kt ni Khi mt user logout ra khi Server th Server hin thng bo user

logout v gi ti Client. ng kt ni. - Xy dng chng trnh Client. To mt TCP Socket vi a ch IP v s cng m chng trnh Server

ang chy Thit lp kt ni ti Server Trao i d liu vi Server. Cp nht cc user khc va logint/logout. Gi/ nhn thng ip ti tt c mi ngi c trong phng cht ng kt ni Thit k giao din hin th khung chat pha Client. - S dng giao thc TCP/IP - Yu cu giao din: Vng thao tc chui(CHAT): CHAT trc tip gia Client v Server khi c kt ni. Trao i d liu vi nhau nh vo Stream nhp v Stream xut.

2.2. Phn tch cc chc nng Chc nng ca chng trnh c th hin qua chng trnh Client v

Server.

Chc nng Chat trong mng LAN: Chui k t nhp t bn phm. n nt Send gi chui k t va nhp giao tip vi nhau gia

Client v Server.



Xy dng chng trnh Client: ni kt n Server trong mng trao i thng tin v truyn ti d liu.

Xy dng chng trnh Server a tuyn kt ni vi nhiu Client: X l cc yu cu ni kt: lng nghe yu cu ni kt ca Client. X l cc thng ip yu cu t Client: chp nhn hoc t chi ni kt.

2.3. Thit k k chng trnh

2.3.1. Thit k giao din

Hnh 11: Giao din login

Hnh 12: Giao din Chat room

Server ip/host name: a ch ip hay hostname ca Server (mc nh l a ch localhost).

Port : s hiu cng kt ni Chat ID: nickname dng ng nhp



Send All : thng tin Chat s c gi ti tt c cc user trong phng Chat

Send PM: thng tin Chat s c gi ti user c ch nh trong phng Chat

File/Exit : thot khi phng Chat

2.3.2. Xy dng cc chc nng

Xy dng chng trnh Client(s dng lp java.net.Socket): M mt socket ni kt n Server bit a ch IP/localhost v s hiu

cng(9999). Ly Stream nhp v Stream xut c gn vi socket. Trao i d liu vi Server nh vo cc Stream nhp v Stream xut. Dng giao thc TCP/IP kim tra d liu trao i vi Server. Xy dng chng trnh Server a tuyn(Server phi lun gi kt ni) X l cc yu cu ni kt: Lng nghe yu cu ni kt. Chp nhn mt yu cu ni kt. To knh giao tip o vi cc Client. X l cc thng ip yu cu t Client. X l cc thng ip yu cu t Client: Ch nhn thng ip ca cc Client. Phn tch v x l yu cu. Gi thng ip tr li cho Client.



Chng 3. TRIN KHAI V NH GI KT QU

3.1. Mi trng trin khai H iu hnh Microsoft Windowns 7 profesional, Microsoft Windowns.

XP.

Eclipse , Netbeans

JDK 1.5

Mng LAN

3.2. Kt qu cc chc nng ca chng trnh

Hnh 13 : Kt ni li khi Server cha chy

Hnh 14 : Chy chng trnh server



Hnh 15 : Login thnh cng vo phng Chat



Hnh 16 : Th nghim Chat private

Hnh 17 : Hin th thng bo login v logout trn Server



KT LUN V HNG PHT TRIN

1. Nhng kt qu t c - M phng c m hnh Client-Server trong mng LAN. - Thc hin c yu cu bi ra(CHAT ROOM). - Dng giao thc TCP/IP trong truyn d liu. - Thc hin c vic kim tra trong ni kt gia Client-Server.

2. Nhng vn tn ti - Chng trnh Chat cn n gin - Giao din s si - Ch thc hin c ni kt gia Client-Server(theo m hnh).

3. Hng pht trin - Hon thin giao din p v ph hp vi ngi dng. - M rng ng dng trong chng trnh Chat nh : + X l truyn file thng qua chng trnh Chat + Xy dng h c s d liu qun l thng tin ng nhp (

username, password ) - Pht trin trn mng rng ngoi LAN.



PH LC

1. Chng trnh Server: 1.1. Chatserver class:

/*

* To change this template, choose Tools | Templates

* and open the template in the editor.

*/

package server;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.*;

import java.util.logging.Level;

import java.util.logging.Logger;

/**

*

* @author anhtuan

*/

public class chatserver implements Runnable{

serverSocket sThread[] = new serverSocket[50];

int maxClient = 0;

public synchronized void send(String username,String message){

if ( username.equals("send_to_all")) {

for(int i=0; i



}

}

}

public synchronized void sendToOther(String username, String

message){

for(int i=0; i



//

// Command :

// request_login|username

// send_all|message

// send_pm|username|message

// logout|username

// list_request

String st[] = inputString.split("\\|");

result = true;

if ((st[0].equals("request_login"))&&maxClient>0) {

for ( int i =0; i< maxClient; i++ ){

if ( sThread[i].userID.equals(st[1]) ) {

result = false;

break;

}

}

}

if (result){

output.writeUTF("OK");

sThread[maxClient] = new serverSocket(this,socket,st[1]);

sThread[maxClient].start();

maxClient++;

System.out.println("IP :

"+socket.getInetAddress().getHostAddress() + " | User ID : " + st[1] + ", has

login in the server.");

sendToOther(st[1], "updateList|");

}

else

{

output.writeUTF("Duplicated ID");


"+socket.getInetAddress().getHostAddress() + " | User ID : " + st[1] + ",

cannot login as duplicated of username.");

}

}

}

catch (IOException ex) {

Logger.getLogger(chatserver.class.getName()).log(Level.SEVERE, null, ex);

}

}



/**

* @param args the command line arguments

*/

public static void main(String[] args) {

new server.chatserver().run();

}

}

1.2. serverSocket class:

/*



*/

package server;




import java.net.Socket;

import java.net.SocketException;



/**

*

* @author anhtuan

*/

public class serverSocket extends Thread{

Socket socket = null;

String userID = null;

boolean active = true;

chatserver cs = null;

public serverSocket(chatserver _cs, Socket incoming, String userID){

this.socket = incoming;

this.userID = userID;

this.active = true;



this.cs = _cs;

}

DataOutputStream output = null;

public void send(String message){

try {

output = new DataOutputStream(socket.getOutputStream());

output.writeUTF(message);

} catch (IOException ex) {

Logger.getLogger(serverSocket.class.getName()).log(Level.SEVERE, null,

ex);

}

}

@Override

public void run(){

DataInputStream input = null;

try {

input = new DataInputStream(socket.getInputStream());


while ((true)&&(this.active)){

String inputString = input.readUTF();

String[] st = inputString.split("\\|"); // Special character to

split - Hechay

// System.out.println(st[0]);

////////// list_request ////////////////

if ( st[0].equals("list_request") ) {

String sendSt = cs.getAliveHost();

// System.out.println(sendSt);

output.writeUTF(sendSt);

}

////////////////////////////////////////

if ( st[0].equals("send_all") ) {

cs.send("send_to_all", "normal|" + this.userID + " : " +st[1]

+ "\n");

}

////////////////////////////////////////

////////////////////////////////////////

if ( st[0].equals("send_pm") ) {



cs.send(st[1], "normal|" + "[PRIVATE] " + this.userID + " :

" + st[2] + "\n");

}

////////////////////////////////////////

////////////////////////////////////////

if ( st[0].equals("logout") ) {

this.active = false;


"+socket.getInetAddress().getHostAddress() + " | User ID : " + this.userID +

", left the chat room.");

this.userID = "Anhtuan-NO-USED-!@#$%^&*()_+";

cs.send("send_to_all", "updateList|");

break;

}

////////////////////////////////////////

}


//

Logger.getLogger(serverThread.class.getName()).log(Level.SEVERE, null,

ex);

System.out.println("Someone is disconnected but I haven't

received the logoff messsage");

}

}

}



2. Chng trnh Client 2.1. Client class:

/*



*/

package client;

import java.io.*;

import java.net.*;



import javax.swing.JList;

import javax.swing.JOptionPane;

/**

*

* @author anhtuan

*/

public class Client extends javax.swing.JFrame implements Runnable {


String username = null;

public void run() {


try {


DataInputStream input = new

DataInputStream(socket.getInputStream());

String sendSt = "list_request";

output.writeUTF(sendSt+"|");

String st[] = new String[50];

String receive = input.readUTF();

st = receive.split("\\|");

jList1.setListData(st);


Logger.getLogger(Client.class.getName()).log(Level.SEVERE,

null, ex);

}



}

Thread thread = null;

public Client(Socket socket, String username) {

initComponents();

this.setLocationRelativeTo(null);

jList1.removeAll();

this.socket = socket;

this.username = username;

new Thread(this).start();

thread = new Thread(new clientSocket(socket,jTextArea1,jList1));

thread.start();

this.setTitle("Your ID : " + username);

jTextField2.requestFocus();

}

/** This method is called from within the constructor to

* initialize the form.

* WARNING: Do NOT modify this code. The content of this method

is

* always regenerated by the Form Editor.

*/

@SuppressWarnings("unchecked")

// //GEN-BEGIN:initComponents

private void initComponents() {

jScrollPane1 = new javax.swing.JScrollPane();

jList1 = new javax.swing.JList();

jTextField2 = new javax.swing.JTextField();

jButton1 = new javax.swing.JButton();


jScrollPane2 = new javax.swing.JScrollPane();

jTextArea1 = new javax.swing.JTextArea();

jMenuBar1 = new javax.swing.JMenuBar();

jMenu1 = new javax.swing.JMenu();

jMenuItem2 = new javax.swing.JMenuItem();

jMenu2 = new javax.swing.JMenu();

jMenuItem1 = new javax.swing.JMenuItem();



setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOS

E);

addWindowListener(new java.awt.event.WindowAdapter() {

public void windowClosing(java.awt.event.WindowEvent evt) {

formWindowClosing(evt);

}

});

jList1.setModel(new javax.swing.AbstractListModel() {

String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item

5" };

public int getSize() { return strings.length; }

public Object getElementAt(int i) { return strings[i]; }

});

jList1.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECT

ION);

jScrollPane1.setViewportView(jList1);

jTextField2.addActionListener(new

java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jTextField2ActionPerformed(evt);

}

});

jTextField2.addKeyListener(new java.awt.event.KeyAdapter() {

public void keyPressed(java.awt.event.KeyEvent evt) {

jTextField2KeyPressed(evt);

}

});

jButton1.setText("Send All");

jButton1.addActionListener(new java.awt.event.ActionListener() {


jButton1ActionPerformed(evt);

}

});

jButton2.setText("Send PM");






}

});

jTextArea1.setColumns(20);

jTextArea1.setEditable(false);

jTextArea1.setRows(5);

jScrollPane2.setViewportView(jTextArea1);

jMenu1.setText("File");

jMenuItem2.setText("Exit");

jMenuItem2.addActionListener(new



jMenuItem2ActionPerformed(evt);

}

});

jMenu1.add(jMenuItem2);

jMenuBar1.add(jMenu1);

jMenu2.setText("Help");

jMenuItem1.setText("About");

jMenuItem1.addActionListener(new



jMenuItem1ActionPerformed(evt);

}

});

jMenu2.add(jMenuItem1);

jMenuBar1.add(jMenu2);

setJMenuBar(jMenuBar1);

javax.swing.GroupLayout layout = new

javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(



layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.

LEADING)


.addGap(10, 10, 10)

.addComponent(jTextField2,

javax.swing.GroupLayout.DEFAULT_SIZE, 360, Short.MAX_VALUE))

.addComponent(jScrollPane2,

javax.swing.GroupLayout.Alignment.TRAILING,

javax.swing.GroupLayout.DEFAULT_SIZE, 370, Short.MAX_VALUE))

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELA

TED)


LEADING)


javax.swing.GroupLayout.DEFAULT_SIZE, 73, Short.MAX_VALUE)


LEADING, false)

.addComponent(jButton2,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)



javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))

.addContainerGap())

);

layout.setVerticalGroup(




LEADING)





.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,

layout.createSequentialGroup()




TED)

.addComponent(jButton2)))


TED)


BASELINE)


javax.swing.GroupLayout.PREFERRED_SIZE,


javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jButton1))

.addContainerGap())

);

pack();

}// //GEN-END:initComponents

private void

jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-

FIRST:event_jMenuItem2ActionPerformed

formWindowClosing(null);

System.exit(0);

}//GEN-LAST:event_jMenuItem2ActionPerformed

private void jButton2ActionPerformed(java.awt.event.ActionEvent

evt) {//GEN-FIRST:event_jButton2ActionPerformed

if

((!jList1.isSelectionEmpty())&&(!jTextField2.getText().equals(""))) {

String selected = (String)jList1.getSelectedValue();

if ( !selected.equals(this.username) ) {


try {

//send_pm|username|message



String sendSt = "send_pm|";

sendSt += (String) jList1.getSelectedValue() + "|";

sendSt += jTextField2.getText();

output = new

DataOutputStream(socket.getOutputStream());

output.writeUTF(sendSt);

jTextArea1.append("[PRIVATE-"+selected+"] " +

jTextField2.getText() );

jTextField2.setText("");


Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);

}

}

else{

JOptionPane.showMessageDialog(null, "You cannot send PM

to yourself!");

}

}

else

{

JOptionPane.showMessageDialog(null, "No User ID Is Selected

or No Message!");

}

}//GEN-LAST:event_jButton2ActionPerformed



if (!jTextField2.getText().equals(""))

{

try {

// TODO add your handling code here:

DataOutputStream output = new


output.writeUTF("send_all|"+jTextField2.getText());

jTextField2.setText("");



}



}

else

{

JOptionPane.showMessageDialog(null, "No message !");

}


private void formWindowClosing(java.awt.event.WindowEvent evt)

{//GEN-FIRST:event_formWindowClosing


if (this.socket != null) {


try {


output.writeUTF("logout|");

thread.interrupt();



}

}

}//GEN-LAST:event_formWindowClosing

private void jTextField2KeyPressed(java.awt.event.KeyEvent evt)

{//GEN-FIRST:event_jTextField2KeyPressed


}//GEN-LAST:event_jTextField2KeyPressed

private void jTextField2ActionPerformed(java.awt.event.ActionEvent

evt) {//GEN-FIRST:event_jTextField2ActionPerformed


jButton1ActionPerformed(null);

}//GEN-LAST:event_jTextField2ActionPerformed

private void

jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-

FIRST:event_jMenuItem1ActionPerformed


new About().setVisible(true);

}//GEN-LAST:event_jMenuItem1ActionPerformed



/**


*/

public static void main(String args[]) {

}

// Variables declaration - do not modify//GEN-BEGIN:variables

private javax.swing.JButton jButton1;


private javax.swing.JList jList1;

private javax.swing.JMenu jMenu1;

private javax.swing.JMenu jMenu2;

private javax.swing.JMenuBar jMenuBar1;

private javax.swing.JMenuItem jMenuItem1;

private javax.swing.JMenuItem jMenuItem2;

private javax.swing.JScrollPane jScrollPane1;

private javax.swing.JScrollPane jScrollPane2;

private javax.swing.JTextArea jTextArea1;

private javax.swing.JTextField jTextField2;

// End of variables declaration//GEN-END:variables

}

2.2. ClientLogin class:

/*



*/

package client;




import java.net.*;



import javax.swing.JOptionPane;

/**

*

* @author anhtuan



*/

public class ClientLogin extends javax.swing.JFrame {

/** Creates new form ClientLogin */

public ClientLogin() {

initComponents();


jTextField3.requestFocus();

}



* WARNING: Do NOT modify this code. ssThe content of this

method is


*/





jLabel1 = new javax.swing.JLabel();








E);

setTitle("Client Login");

jTextField1.setText("127.0.0.1");

jLabel1.setText("Server IP/Hostname");

jLabel2.setText("Port");



jTextField2.setEditable(false);

jTextField2.setText("9999");

jLabel3.setText("Chat ID");

jButton1.setText("Login");




}

});

jButton2.setText("Exit");




}

});







.addGap(26, 26, 26)


LEADING)


.addComponent(jButton1)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED

)




LEADING)

.addComponent(jLabel1)




.addComponent(jLabel3))


)


LEADING)




javax.swing.GroupLayout.PREFERRED_SIZE, 40,



javax.swing.GroupLayout.DEFAULT_SIZE, 118, Short.MAX_VALUE))))

.addGap(22, 22, 22))

);




.addContainerGap()


BASELINE)





javax.swing.GroupLayout.PREFERRED_SIZE))


)


BASELINE)









)


BASELINE)






.addGap(18, 18, 18)


BASELINE)



.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,

Short.MAX_VALUE))

);

pack();





System.exit(0);




if (jTextField3.getText().equals("")){

JOptionPane.showMessageDialog(null, "User ID cannot be

blank !");

}

else

{

try {




// Send the request to the server, if the userid is duplicate,

program will ask to change userID

String serverIP = jTextField1.getText();

int serverPort = Integer.parseInt(jTextField2.getText());

Socket socket = new Socket(serverIP, serverPort);

String request = "request_login|"+jTextField3.getText();





output.writeUTF(request);


if (receive.equals("OK")){

new Client(socket,jTextField3.getText()).setVisible(true);

dispose();

}

else

{

JOptionPane.showMessageDialog(null, receive, "Error", 0);

}

} catch (UnknownHostException ex) {

//Logger.getLogger(ClientLogin.class.getName()).log(Level.SEVERE, null,

ex);

JOptionPane.showMessageDialog(null, "Network got

problems. Try again ...");


//Logger.getLogger(ClientLogin.class.getName()).log(Level.SEVERE, null,

ex);

JOptionPane.showMessageDialog(null, "Network got

problems. Try again ...");

}

}


/**


*/


java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {



new ClientLogin().setVisible(true);

}

});

}





private javax.swing.JLabel jLabel1;







}

2.3. clientSocket

/*



*/

package client;




import java.net.*;



import javax.swing.JList;

import javax.swing.JTextArea;

/**

*

* @author anhtuan

*/

public class clientSocket implements Runnable {


JTextArea chatArea = null;



JList list = null;

public clientSocket(Socket socket, JTextArea chatArea,JList list){

this.socket = socket;

this.chatArea = chatArea;

this.list = list;

}

public void run() {

try {



while(true){

if (!socket.isInputShutdown()){


String st[] = receive.split("\\|");

// Normal message ////////////

if (st[0].equals("normal")) {

chatArea.append(st[1]);

}

//////////////////////////////

// List Command

if (st[0].equals("updateList")) {



String sendSt = "list_request";

output.writeUTF(sendSt+"|");

String st1[] = new String[50];

String receive1 = input.readUTF();

st1 = receive1.split("\\|");

list.removeAll();

list.setListData(st1);

}

//////////////////////////////

}

}


Logger.getLogger(clientSocket.class.getName()).log(Level.SEVERE, null,

ex);

}



}

}

About class

/*



*/

package client;

/**

*

* @author anhtuan

*/

public class About extends javax.swing.JFrame {

/** Creates new form About */

public About() {

initComponents();


}



* WARNING: Do NOT modify this code. The content of this method

is


*/







E);



setTitle("About");

jLabel1.setText("This product was developed by Tran Anh Tuan");

jButton1.setText("OK");




}

});








LEADING)


.addContainerGap()



.addGap(90, 90, 90)


javax.swing.GroupLayout.PREFERRED_SIZE, 108,

javax.swing.GroupLayout.PREFERRED_SIZE)))


Short.MAX_VALUE))

);




.addContainerGap()



)





Short.MAX_VALUE))

);

pack();





this.dispose();


/**


*/


java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new About().setVisible(true);

}

});

}





}



TI LIU THAM KHO

http://www.songmay.com/index.php?fs=main&loai=14&sub=2&tieude

=Mi4gVENQL0lQIGzDoCBnw6w/&chude=RkFRcyAvIEludGVybmV0.

http://vi.wikipedia.org/wiki/Client-server

http://vi.wikipedia.org/wiki/TCP#C.E1.BA.A5u_tr.C3.BAc_g.C3.B3i_ti

n

http://hpcc.hut.edu.vn/forum/index.php?topic=213.0

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http://www.softechaptech.com/forums/viewtopic.php?f=83&t=95

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