Download pdf - Tran Anh Tuan_06T3_102103061149

8/6/2019 Tran Anh Tuan_06T3_102103061149

1/34

TRNG I HC BCH KHOA

KHOA CNG NGH THNG TIN

B MN MNG V TRUYN THNG

BO COTHC HNH LP TRNH MNG

SV thc hin : Trn Anh TunLp : 06T3Nhm : 08AGV hng dn : Nguyn Vn Nguyn

Nng 2011

MC LC

8/6/2019 Tran Anh Tuan_06T3_102103061149

2/34

Thc hnh lp trnh mng GVHD: Nguyn Vn Nguyn

CHNG 1. C S L THUYT ........................................................................41.1. MHNHCLIENT-SERVER: ..................................................................................51.2. GIAOTHC TCP ..............................................................................................61.3. GIAOTHC UDP: ............................................................................................6

CHNG 2. THIT K V XY DNG CHNG TRNH ...........................72.1. LAB1 ............................................................................................................7

2.1.1. Net1 .....................................................................................................72.1.2. Student Manager .................................................................................92.1.3. NumberTCPSimple ...........................................................................12

2.2. LAB2 ..........................................................................................................172.2.1. Net1 ...................................................................................................172.2.2. Net2 ...................................................................................................182.2.3. Net3 ...................................................................................................202.2.4. Net4 ...................................................................................................21

2.2.5. KnockKnock .....................................................................................222.3. LAB3 ..........................................................................................................272.3.1. MulticastPeer ....................................................................................272.3.2. Multicast ............................................................................................29

CHNG 3. KT LUN V HNG PHT TRIN .....................................34

Chng 1. C S L THUYT

SVTH: Trn Anh Tun _06T3 _Nhm 8A 4

8/6/2019 Tran Anh Tuan_06T3_102103061149

3/34


1.1. M hnh client-server:M hnh client/server nh sau: Client/Server l m hnh tng qut nht, trn thc t

th mt server c th c ni ti nhiu server khc nhm lm vic hiu qu v nhanhhn. Khi nhn c 1 yu cu t client, server ny c th gi tip yu cu va nhn

c cho server khc v d nh database server v bn thn n khng th x l yu cuny c. My server c th thi hnh cc nhim v n gin hoc phc tp. V d nhmt my ch tr li thi gian hin ti trong ngy, khi mt my client yu cu ly thngtin v thi gian n s phi gi mt yu cu theo mt tiu chun do server nh ra, nuyu cu c chp nhn th my server s tr v thng tin m client yu cu. C rtnhiu cc dch v server trn mng nhng n u hot ng theo nguyn l l nhn ccyu cu t client sau x l v tr kt qu cho client yu cu. Thng thng chngtrnh server v client c thi hnh trn hai my khc nhau. Cho d lc no server cng trng thi sn sng ch nhn yu cu t client nhng trn thc t mt tin trnh lintc qua li (interaction) gia client v server li bt u pha client, khi m client gi

tn hiu yu cu ti server. Cc chng trnh server thng u thi hnh mc ngdng (tng ng dng ca mng). S thun li ca phng php ny l n c th lmvic trn bt c mt mng my tnh no c h tr giao thc truyn thng chun c th y l giao thc TCP/IP. Vi cc giao thc chun ny cng gip cho cc nh sn xutc th tch hp nhiu sn phm khc nhau ca h ln mng m khng gp phi khkhn g. Vi cc chun ny th cc chng trnh server cho mt dch v no y c ththi hnh trn mt h thng chia s thi gian (timesharing system) vi nhiu chngtrnh v dch v khc hoc n c th chy trn chnh mt my tnh cc nhn bnhthng. C th c nhiu chng server cng lm mt dch v, chng c th nm trnnhiu my tnh hoc mt my tnh. Vi m hnh trn chng ta nhn thy rng m hnh

client/server ch mang c im ca phn mm khng lin quan g n phn cng mcd trn thc t yu cu cho mt my server l cao hn nhiu so vi my client. L do l

bi v my server phi qun l rt nhiu cc yu cu t cc clients khc nhau trn mng.u v nhc im chnh C th ni rng vi m hnh client/server th mi th dngnh u nm trn bn ca ngi s dng, n c th truy cp d liu t xa (bao gm cccng vic nh gi v nhn file, tm kim thng tin, ...) vi nhiu dch v a dng m mhnh c khng th lm c. M hnh client/server cung cp mt nn tng l tng cho

php tch hp cc k thut hin i nh m hnh thit k hng i tng, h chuyngia, h thng tin a l (GIS) ... Mt trong nhng vn ny sinh trong m hnh ny l tnh an ton v bo mt thng tin trn mng. Do phi trao i d liu gia 2 my 2khu vc khc nhau cho nn d dng xy ra hin tng thng tin truyn trn mng b l.


8/6/2019 Tran Anh Tuan_06T3_102103061149

4/34


1.2. Giao thc TCP

- B giao thc TCP/IP, ngn gn l TCP/IP (ting Anh: Internet protocol

suite hoc IP suite hoc TCP/IP protocol suite - b giao thc lin mng), l mt b

cc giao thc truyn thng ci t chng giao thc m Internet v hu ht cc mngmy tnh thng mi ang chy trn . B giao thc ny c t tn theo hai giao

thc chnh ca n l TCP (Giao thc iu khin Giao vn) v IP (Giao thc Lin

mng). Chng cng l hai giao thc u tin c nh ngha.

- Nh nhiu b giao thc khc, b giao thc TCP/IP c th c coi l mt

tp hp cc tng, mi tng gii quyt mt tp cc vn c lin quan n vic truyn

d liu, v cung cp cho cc giao thc tng cp trn mt dch v c nh ngha r

rng da trn vic s dng cc dch v ca cc tng thp hn. V mt lgic, cc tng

trn gn vi ngi dng hn v lm vic vi d liu tru tng hn, chng da vocc giao thc tng cp di bin i d liu thnh cc dng m cui cng c th

c truyn i mt cch vt l.

- M hnh OSI miu t mt tp c nh gm 7 tng m mt s nh sn xut la

chn v n c th c so snh tng i vi b giao thc TCP/IP. S so snh ny c

th gy nhm ln hoc mang li s hiu bit su hn v b giao thc TCP/IP.

1.3. Giao thc UDP:- UDP (User Datagram Protocol) l mt trong nhng giao thc ct li ca giao

thc TCP/IP. Dng UDP, chng trnh trn mng my tnh c th gi nhng d liu

ngn c gi l datagram ti my khc. UDP khng cung cp s tin cy v th t

truyn nhn m TCP lm; cc gi d liu c th n khng ng th t hoc b mt m

khng c thng bo. Tuy nhin UDP nhanh v hiu qu hn i vi cc mc tiu nh

kch thc nh v yu cu kht khe v thi gian. Do bn cht khng trng thi ca n

nn n hu dng i vi vic tr li cc truy vn nh vi s lng ln ngi yu cu.

- Nhng ng dng ph bin s dng UDP nh DNS (Domain Name System), ng

dng streaming media,Voice over IP, Trivial File Transfer Protocol (TFTP), v game

trc tuyn.

http://vi.wikipedia.org/wiki/Ti%E1%BA%BFng_Anhhttp://vi.wikipedia.org/wiki/Giao_th%E1%BB%A9c_truy%E1%BB%81n_th%C3%B4nghttp://vi.wikipedia.org/wiki/Ch%E1%BB%93ng_giao_th%E1%BB%A9chttp://vi.wikipedia.org/wiki/Internethttp://vi.wikipedia.org/wiki/TCPhttp://vi.wikipedia.org/wiki/IPhttp://vi.wikipedia.org/w/index.php?title=Giao_th%E1%BB%A9c_t%E1%BA%A7ng_c%E1%BA%A5p_tr%C3%AAn&action=edit&redlink=1http://vi.wikipedia.org/w/index.php?title=Giao_th%E1%BB%A9c_t%E1%BA%A7ng_c%E1%BA%A5p_d%C6%B0%E1%BB%9Bi&action=edit&redlink=1http://vi.wikipedia.org/wiki/M%C3%B4_h%C3%ACnh_OSIhttp://vi.wikipedia.org/wiki/Giao_th%E1%BB%A9c_TCP/IPhttp://vi.wikipedia.org/wiki/Giao_th%E1%BB%A9c_TCP/IPhttp://vi.wikipedia.org/wiki/M%E1%BA%A1ng_m%C3%A1y_t%C3%ADnhhttp://vi.wikipedia.org/w/index.php?title=Datagram&action=edit&redlink=1http://vi.wikipedia.org/wiki/TCPhttp://vi.wikipedia.org/wiki/DNShttp://vi.wikipedia.org/w/index.php?title=Streaming_media&action=edit&redlink=1http://vi.wikipedia.org/wiki/Voice_over_IPhttp://vi.wikipedia.org/w/index.php?title=Trivial_File_Transfer_Protocol&action=edit&redlink=1http://vi.wikipedia.org/w/index.php?title=Game_tr%E1%BB%B1c_tuy%E1%BA%BFn&action=edit&redlink=1http://vi.wikipedia.org/w/index.php?title=Game_tr%E1%BB%B1c_tuy%E1%BA%BFn&action=edit&redlink=1http://vi.wikipedia.org/wiki/Ti%E1%BA%BFng_Anhhttp://vi.wikipedia.org/wiki/Giao_th%E1%BB%A9c_truy%E1%BB%81n_th%C3%B4nghttp://vi.wikipedia.org/wiki/Ch%E1%BB%93ng_giao_th%E1%BB%A9chttp://vi.wikipedia.org/wiki/Internethttp://vi.wikipedia.org/wiki/TCPhttp://vi.wikipedia.org/wiki/IPhttp://vi.wikipedia.org/w/index.php?title=Giao_th%E1%BB%A9c_t%E1%BA%A7ng_c%E1%BA%A5p_tr%C3%AAn&action=edit&redlink=1http://vi.wikipedia.org/w/index.php?title=Giao_th%E1%BB%A9c_t%E1%BA%A7ng_c%E1%BA%A5p_d%C6%B0%E1%BB%9Bi&action=edit&redlink=1http://vi.wikipedia.org/wiki/M%C3%B4_h%C3%ACnh_OSIhttp://vi.wikipedia.org/wiki/Giao_th%E1%BB%A9c_TCP/IPhttp://vi.wikipedia.org/wiki/Giao_th%E1%BB%A9c_TCP/IPhttp://vi.wikipedia.org/wiki/M%E1%BA%A1ng_m%C3%A1y_t%C3%ADnhhttp://vi.wikipedia.org/w/index.php?title=Datagram&action=edit&redlink=1http://vi.wikipedia.org/wiki/TCPhttp://vi.wikipedia.org/wiki/DNShttp://vi.wikipedia.org/w/index.php?title=Streaming_media&action=edit&redlink=1http://vi.wikipedia.org/wiki/Voice_over_IPhttp://vi.wikipedia.org/w/index.php?title=Trivial_File_Transfer_Protocol&action=edit&redlink=1http://vi.wikipedia.org/w/index.php?title=Game_tr%E1%BB%B1c_tuy%E1%BA%BFn&action=edit&redlink=1http://vi.wikipedia.org/w/index.php?title=Game_tr%E1%BB%B1c_tuy%E1%BA%BFn&action=edit&redlink=1

8/6/2019 Tran Anh Tuan_06T3_102103061149

5/34


Chng 2. THIT K V XY DNG CHNGTRNH

2.1. LAB1

2.1.1. Net1

bi: Vit chng trnh x l chui nhp, dng n khi to i tng URL vtr v thuc tnh ca n

Chc nng chng trnh:

- Truy cp vo URL, sau in cc thng tin ca ti nguyn nh:

o Tn file

o Tn host


8/6/2019 Tran Anh Tuan_06T3_102103061149

6/34


o S hiu cng

o Kiu giao thc (https hoc http hoc ftp)

C ch:

- Client gi yu cu n SERVER- SERVER tr v thng tin ti nguyn

- Client xut ra console

Cc lp v chc nng cc lp:

- Chng trnh n gin nn ch c hm main m ko c cc thuc tnh hayphng thc

- Khi bin dch chy ngi s dng truyn i s vo, lc chng trnh shin th cc thng tin

- S dng lp URL c sn truy cpTrin khai:

Net1.java

package Lab1;

import java.net.*;

public class Net1 {

public static void main(String args[]){

try{URL u=new URL("http://www.vnexpress.net:8080");

System.out.println("Name of the file is:"+ u.getFile());

System.out.println("Host name is:"+ u.getHost());

System.out.println("Port number is:"+ u.getPort());

System.out.println("Protocol type is:"+ u.getProtocol());

}catch(MalformedURLException e){

System.out.println(e);}

}

}

Kt qu:


8/6/2019 Tran Anh Tuan_06T3_102103061149

7/34


2.1.2. Student Manager

bi: To ra 2 ng dng c lp. ng dng u tin nhn cu lnh cho bngstudents c thuc tnh: name, id v age thm vo bng. Cn ng dng th hai th inra mn hnh thng tin t bng students trn

Add Student

Chc nng chng trnh:

- Kt ni c s d liu

- Thm mt trng vo c s d liu

C ch:

- To kt ni n Driver ca h qun tr c s d liu

- T , thc thi cu lnh x l CSDL

- Kim tra vic thm c thnh cng hay ko, nu ko th bo li


- Cng nh lp Net1, lp ny cha hm main, ko c thuc tnh v phngthc g khc

- To i tng Connection kt ni n Driver ca h qun tr CSDL, nu vicload driver khng thnh cng th thot chng trnh

- To i tng Statement thc thi cu lnh x l CSDL ( y l Insert), sdng phng thc execute thc thi cc lnh khng cn truy vn, i str v l kiu int, tr v 1 nu thnh cng, v gi tr khc th tht bi

Get Students1

Chc nng chng trnh:

- Kt ni CSDL

- Truy vn

C ch:

- To kt ni n Driver ca h qun tr c s d liu

- T , thc thi cu lnh truy vn CSDL

- Xut kt qu ra mn hnh

1


8/6/2019 Tran Anh Tuan_06T3_102103061149

8/34



- Tng t nh lp add student, khi to Statement th s dng phng thcexcecuteQuery thay v execute, kiu tr v l ResultSet

- T ResultSet tr v, hin th n ln mn hnh

Trin khai:

AddStudent.java

package Lab1;

import java.sql.*;

public class AddStudent {


Connection connection=null;

try{

Class.forName("org.gjt.mm.mysql.Driver").newInstance();

}catch(Exception e){

System.out.println("Registering the Driver was failed");

}

try{

connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/u

niversitydb");}catch(Exception e){

System.out.println("Connection with the DataBase failed");

e.printStackTrace();

System.exit(1);

}

Statement statement=null;

try{statement=connection.createStatement();

boolean temp=statement.execute("insert into students value('AnhTuan,'012','06t3'");

//boolean temp=statement.execute("insert into students value('"+ args[0] +"','" + args[1]+ "','" + args[2]+ "')");

if(temp)System.out.println("a line was added to the table");

}catch(SQLException e){


}finally{


8/6/2019 Tran Anh Tuan_06T3_102103061149

9/34


try{

statement.close();

connection.close();



}

}

}

}

GetStudent.java

package Lab1;

import java.sql.*;

public class GetStudent {


Connection connection=null;

try{

Class.forName("org.gjt.mm.mysql.Driver").newInstance();


System.out.println("Registering the Driver was failed");

}

try{

connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/universityDB");


System.out.println("Connection with the DataBase failed");


System.exit(1);

}

Statement statement=null;

try{

statement=connection.createStatement();

ResultSet result=statement.executeQuery("select * from student");

while(result.next()){


8/6/2019 Tran Anh Tuan_06T3_102103061149

10/34


System.out.println(result.getString(1)+ "," + result.getString(2) + "," +result.getString(3));

}



}finally{

try{

statement.close();

connection.close();



}

}

}

}

Kt qu:

2.1.3. NumberTCPSimple

bi: To ra hai ng dng c lp (mt client v mt server). Client chp nhnmt trong cc s sau: 1, 2, 3. S ny s c gi n server. Server s tr li tng


8/6/2019 Tran Anh Tuan_06T3_102103061149

11/34


ng : ONE hoc TWO hoc THREE (ty theo s nhn c). Dng giao thcTCP/IP

Chc nng chng trnh:

- Client gi s bt k n SERVER

- Nu l s 1,2,3 th tr v ONE,TWO,THREE, cc trng hp cn li tr vUNKNOWN

C ch:

- SERVER m cng client truy xut n

- To cc lung nhp xut khi c client truy cp n (c client v SERVER),lc ny client v server c th gi thng tin qua li ln nhau

- Client truy cp vo, sau gi thng tin n server

- Server nhn c thng tin, ri x l, sau gi tr li client- Client hin th thng tin m server tr v


NumberTCPSimpleServer

- Lp ny c phng thc go(), chc nng ca n:

o M cng ca server, to kt ni mi khi c client kt ni

o Ch nhn d liu t Client gi ln

o X l d liuo Tr v client

- Phng thc main ca lp ny to ra i tng thuc lpNumberTCPSimpleServer, sau gi phng thc go() ca lp ny

NumberTCPSimpleClient

- Phng thc khi to ca lp ny c i s l chui v a ch ca server

- Phng thc go():

o To kt ni n a ch v s hiu cng ca server

o To cc lung nhp xut lin kt vi server

o a d liu cn gi hoc nhn vo cc lung ny

o Gi d liu n server

o Nhn d liu (sau khi server x l) ri hin th ln mn hnh

Trin khai:

NumbersTCPSimpleClient.java

package Lab1.Cau3;import java.io.*;


8/6/2019 Tran Anh Tuan_06T3_102103061149

12/34


import java.net.*;

public class NumbersTCPSimpleClient {

public static final int DT_PORT=1300;

String hostName;

Socket soc;


NumbersTCPSimpleClient client=new NumbersTCPSimpleClient("localhost");

try{

client.go("1");

}catch(IOException e){


}catch(ClassNotFoundException e){


}

}

public NumbersTCPSimpleClient(String hostString){

this.hostName=hostString;

}

public void go(String str)throws IOException,ClassNotFoundException{

soc=new Socket(hostName,DT_PORT);

//creating an InputStream that will be connect to soc

InputStream is=soc.getInputStream();

//creating an ObjectInputStream object

ObjectInputStream ois=new ObjectInputStream(is);

//creating an OutputStream that will be connect to soc

OutputStream os=soc.getOutputStream();

//creating an ObjectOutputStream object

ObjectOutputStream oos=new ObjectOutputStream(os);

//sending data to server

oos.writeObject(str);

System.out.println(str+" was sent");

//receive from server

String temp=(String)ois.readObject();

System.out.println(temp+" was receive");


8/6/2019 Tran Anh Tuan_06T3_102103061149

13/34

8/6/2019 Tran Anh Tuan_06T3_102103061149

14/34


//creating an ObjectOutputStream object

ObjectOutputStream oos=new ObjectOutputStream(os);

//creating an InputStream object

InputStream is=soc.getInputStream();

//creating an ObjectInputStream object

ObjectInputStream ois=new ObjectInputStream(is);

String receive=(String)ois.readObject();

String returned=null;

if(receive.equals("1"))

returned="ONE";

else


returned="TWO";

else


returned="THREE";

else

returned="UNKNOWN";

oos.writeObject(returned);

oos.close();

ois.close();

soc.close();

}

}

}

Kt qu:

Client


8/6/2019 Tran Anh Tuan_06T3_102103061149

15/34


SERVER

2.2. LAB2

2.2.1. Net1

bi: Vit chng trnh lit k ton b ni dung ca bt k trang web no trn net

Chc nng chng trnh:

- Hin th thng tin ton b trang web ca bt k trang web no di dng textn thun

C ch:

- Gi a ch URL

- Web server tr li thng tin

- Truy xut n thng tin cn thit v hin thCc lp v chc nng cc lp:

- Ch gm mt phng thc main:

o Lin kt n URL vi a ch c nhp vo

o S dng phng thc getContent() ca i tng URL nhn tonb ni dung ca trang web

o c ton b ni dung v hin th ln mn hnh

Trin khai:

net1.java

package Lab2;

import java.net.*;

import java.io.*;

public class net1 {


int i;

BufferedInputStream bis;

try{


8/6/2019 Tran Anh Tuan_06T3_102103061149

16/34


URL u=new URL("http://www.thanhnien.com.vn");

bis=new BufferedInputStream((InputStream)u.getContent());

while((i=bis.read())>0){

System.out.print((char)i);

//System.out.println();

}

}catch(MalformedURLException e){

System.out.println(e);

}

catch(IOException e){


}

}

}

Kt qu:

2.2.2. Net2

bi: Vit chng trnh gi n URL mt chui, m kt ni t URL ny v hinth thng tin header

Chc nng chng trnh:

- M kt ni n a ch URL

- Hin th thng tin cc header nhn c

C ch:

- Truy xut n a ch URL

- To kt ni n n

- Ly thng tin v Header

- Hin th ln mn hnh


- Cng ch c phng thc main:

o To URL kt ni n a ch nhp vo


8/6/2019 Tran Anh Tuan_06T3_102103061149

17/34


o M kt ni (s dng phng thc openConnection ca i tngURL)

o Ly thng tin header (dng phng thc getHeaderField,getHeaderFieldKey ca i tng URLconnection)

o Hin th thng tin header

o In thng bo li nu c li xy ra

Trin khai:

net2.java

package Lab2;

import java.net.*;

import java.io.*;

public class net2 {


int i=1;

BufferedInputStream bis;

try{

URL ul=new URL("http://www.thanhnien.com.vn");

URLConnection u=ul.openConnection();

String s=u.getHeaderField(i);

String sg=u.getHeaderFieldKey(i);

while(s!=null){

System.out.println("Header "+i+": "+sg+" = "+s);

i++;

s=u.getHeaderField(i);

sg=u.getHeaderFieldKey(i);

}}catch(MalformedURLException e){


}

catch(IOException e){


}

}}


8/6/2019 Tran Anh Tuan_06T3_102103061149

18/34


Kt qu:

2.2.3. Net3

bi: Vit chng trnh in ra a ch ca localhost (a ch cc b), null host va ch bt k trn internet

Chc nng chng trnh:

- Hin th thng tin v a ch cc b, a ch null v a ch bt k trn internet

C ch:


- To i tng InetAddress

- S dng phng thc getLocalHost() ly thng tin v a ch cc b vhin th n

- S dng phng thc getByName(null) ly thng tin v a ch null vhin th n

- S dng phng thc getByName(URL) ly thng tin v a ch URL camt website v hin th n

- Hin th li nu c

Trin khai:

Net3.javapackage Lab2;

import java.io.*;

import java.net.*;

public class net3 {


InetAddress i;

try{

i=InetAddress.getLocalHost();

System.out.println("The localhost is: "+ i);


8/6/2019 Tran Anh Tuan_06T3_102103061149

19/34


i=InetAddress.getByName(null);

System.out.println("The Null host is: "+ i);

i=InetAddress.getByName("www.yahoo.com");

System.out.println("Yahoo Host address is: "+i);



}

}

}

Kt qu:

2.2.4. Net4

bi: Vit chng trnh m kt ni dng i tng URL v kim tra cc thuctnh v ni dung ca ti nguyn nhn c.

Chc nng chng trnh:

- Hin th cc thng tin v ti nguyn nhn c trn internet nh ngy to,ngy chnh sa sau cng, ngy ht hn

C ch:


- Tng t nh Net3, thay v s dng phng thc getHeaderField th s dnggetDate(), getContentType() ca i tng URLConnection thay th

- Duyt ht ton b ni dung v hin th ra mn hnh

Trin khai:

net4.java

package Lab2;

import java.net.*;

import java.io.*;import java.util.*;

public class net4 {


8/6/2019 Tran Anh Tuan_06T3_102103061149

20/34


public static void main(String args[])throws IOException{

int i;

URL ul=new URL("http://www.24.com.vn");

URLConnection u=ul.openConnection();

System.out.println("Date: "+ new Date(u.getDate()));

System.out.println("Content-type:"+u.getContentType());

System.out.println("Expires: "+u.getExpiration());

System.out.println("Last Modified: "+u.getLastModified());

int l=u.getContentLength();

System.out.println("Content_length: "+ l);

if(l>0){

System.out.println("Content");

InputStream is=u.getInputStream();

int a=l;

while(((i=is.read())!=-1)&&(--a>0)){

System.out.print((char)i);

}

is.close();

}

else

System.out.println("Content is not available");

}

}

Kt qu:

2.2.5. KnockKnock bi:Vit ng dng minh ha gi d liu n server v client x l n


8/6/2019 Tran Anh Tuan_06T3_102103061149

21/34


V d hai chng trnh c lp chy trn JAVA: chng trnh client v chng trnhserver. Chng trnh client thc thi mt lp KnockKnockClient. Chng trnh serverthc thi hai lp: KnockKnockServer v KnockKnockProtocol. KnockKnockServercha phng thc main cho chng trnh server v m cng, kt ni v c, gi d liun socket, cn KnockKnockProtocol x l jokes. N theo di cc joke hin ti, trng

thi hin ti (gi knock knock, gi clue, v.v). v tr v gi tr khc nhau ca joke catrng thi hin ti. i tng thc thi giao thc xc inh ngn ng giao tip giaclient v server

Chc nng chng trnh:

- Mt chng trnh vui nhn, trao i thng ip client-server qua li ln nhau,ta nh chat hoc game

C ch:

- Dng c ch client/server gi nhn thng ip


- Khi client v server kt ni vi nhau th Server s hin th Knock!Knock!

- Nu ngi s dng gi Whos there?, server s gi tn hin ti ca ngi trong chui clues vi ch s l currentJoke l ch s ca ngi hin ti

- Nu tip tc gi tn ca ngi hin ti + who? (Tc l hi h l ai), th nkt hp vi chui answers tr li cho client

- Server s hi c mun tip tc khng, nu client ng th n s chuyn nngi tip theo l ngi hin hnh, c nh vy cho n khi ngi s dng

khng mun tip tc naTrin khai:

KnockKnockServer.java

package Lab2.Cau5;

import java.io.*;

import java.net.*;

public class KnockKnockServer {

public static void main(String args[])throws IOException{ServerSocket serverSocket=null;

try{

serverSocket=new ServerSocket(4444);


System.err.println("Could not listen on port: 4444");

System.exit(1);

}Socket clientSocket=null;


8/6/2019 Tran Anh Tuan_06T3_102103061149

22/34


try{

clientSocket=serverSocket.accept();


System.err.println("Accept failed");

System.exit(1);

}

PrintWriter out=new PrintWriter(clientSocket.getOutputStream(),true);

BufferedReader in=new BufferedReader(newInputStreamReader(clientSocket.getInputStream()));

String inputLine,outputLine;

KnockKnockProtocol kkp=new KnockKnockProtocol();

outputLine=kkp.processInput(null);

out.println(outputLine);

while((inputLine=in.readLine())!=null){

outputLine=kkp.processInput(inputLine);

out.println(outputLine);

if(outputLine.equals("Bye!"))break;

}

out.close();

in.close();

clientSocket.close();

serverSocket.close();

}

}

KnockKnockProtocol.java

package Lab2.Cau5;

public class KnockKnockProtocol {

private static final int WAITING=0;

private static final int SENTKNOCKKNOCK=1;

private static final int SENTCLUE=2;

private static final int ANOTHER=3;

private static final int NUMJOKES=5;

private int state=WAITING;private int currentJoke=0;


8/6/2019 Tran Anh Tuan_06T3_102103061149

23/34


private String []clues={"Turnip","Little Old Lady","Atch","Who","Who"};

private String []answers={"Turnip the heat, it's cold in here!","I didn't know youcould yodel!","Bless you!","Is there an owl in here?","Is there an echo in here?"};

public String processInput(String theInput){

String theOutput=null;

if(state==WAITING){

theOutput="Knock! Knock!";

state =SENTKNOCKKNOCK;

}

else if(state==SENTKNOCKKNOCK){

if(theInput.equalsIgnoreCase("Who's there?")){

theOutput=clues[currentJoke];

state=SENTCLUE;

}else theOutput="You're supposed to say \"Who there?\"!"+"Try again.Knock! Knock!";

}

else if (state == SENTCLUE) {

if(theInput.equalsIgnoreCase(clues[currentJoke])){

theOutput=answers[currentJoke]+ "Want another? (y/n)";state=ANOTHER;

}else{

theOutput="You're supposed to say \""+clues[currentJoke]+ " Who?\""+"!Try again. Knock! Knock!";

state=SENTKNOCKKNOCK;

}

}

else if(state==ANOTHER){

if(theInput.equalsIgnoreCase("y")){

theOutput="Knock! Knock!";

if(currentJoke==NUMJOKES-1)

currentJoke=0;

else

currentJoke++;

state=SENTKNOCKKNOCK;

}else{


8/6/2019 Tran Anh Tuan_06T3_102103061149

24/34


theOutput="Bye!";

state=WAITING;

}

}

return theOutput;

}

}

KnockKnockClient.java

package Lab2.Cau5;

import java.net.*;

import java.io.*;

public class KnockKnockClient {


Socket kkSocket=null;

PrintWriter out=null;

BufferedReader in=null;

try{

kkSocket=new Socket("localhost",4444);

out=new PrintWriter(kkSocket.getOutputStream(),true);

in=new BufferedReader(newInputStreamReader(kkSocket.getInputStream()));

}catch(UnknownHostException e){

System.err.println("Don't known about host: localhost");

System.exit(1);


System.err.println("Couldn't get I/O for the connection to: localhost");

System.exit(1);

}

BufferedReader stdIn=new BufferedReader(newInputStreamReader(System.in));

String fromServer;

String fromUser;

while((fromServer=in.readLine())!=null){System.out.println("Server: "+ fromServer);


8/6/2019 Tran Anh Tuan_06T3_102103061149

25/34


if(fromServer.equals("Bye!"))break;

fromUser=stdIn.readLine();

if(fromUser!=null){

System.out.println("Client: "+ fromUser);

out.print(fromUser);

}

}

out.close();

in.close();

stdIn.close();

kkSocket.close();

}

}

Kt qu:

SERVER

CLIENT

2.3. LAB3

2.3.1. MulticastPeer

bi: Xy dng chng trnh multicast theo mu bn di


8/6/2019 Tran Anh Tuan_06T3_102103061149

26/34


Chc nng chng trnh:

- Tham gia vo group ca multicast

- Gi d liu n a ch multicast

- Nhn d liu t multicast

- Hin th ln mn hnh

- Ch cn cc client tham gia vo group ca a ch multicast ny th khi c dliu c gi vo th tt c client u nhn c

C ch:

- Tham gia vo group ca a ch multicast

- Gi d liu n a ch multicast (Lc ny cc client mun nhn c thphi tham gia vo group ca multicast th mi nhn c)

- V trong chng trnh cng tham gia vo group multicast nn n cng snhn c d liu khi c client gi vo a ch ny


- Chy chng trnh gm 2 i s: i s u tin v d liu cn gi i, i sth 2 l a ch multicast

- Ch gm mt phng thc main():

- To cng lin kt n multicast

- Tham gia vo group multicast

- Chuyn i s th nht thnh mng byte, ri to i tng DatagramPacket gi d liu i (gi phng thc send ca i tng DatagramPacket)

- Gi phng thc receive nhn d liu t a ch multicast

- Ri khi nhm multicast khng nhn d liu t a ch ny na

Trin khai:

MulticasPeer.java

package Lab3;

import java.net.*;import java.io.*;

public class MulticasPeer {


MulticastSocket s=null;

try{

InetAddress group=InetAddress.getByName(args[1]);

//The hard-coded port number in 6789(the client must have aMulticastSocket bound to this port)

s=new MulticastSocket(6789);


8/6/2019 Tran Anh Tuan_06T3_102103061149

27/34


//The input InetAddress is the multicase group

s.joinGroup(group);

byte []m=args[0].getBytes();

DatagramPacket dp= new DatagramPacket(m,m.length,group,6789);

s.send(dp);

//buffer used to receive

byte []buffer=new byte[1000];

for(int i=0;i

8/6/2019 Tran Anh Tuan_06T3_102103061149

28/34


- Cc client hin th cc thng tin nhn c t server

C ch:

- Server c tng dng d liu t file one-liners.txt

- Vi mi dng d liu, gi n n a ch multicast l 230.0.0.1, mi ln giserver tm dng vi giy (l bi s ca 5)

- Tt c cc client tham gia vo multicast trn s nhn c d liu t servergi n (bnh thng nu theo c ch TCP s lm kh hn)

- Client hin th n ln mn hnh ca mnh, trong chng trnh c thit kch nhn 5 dng


Lp QuoteServerThread:

- C 2 phng thc khi to, khng c i s hoc c 1 i s l tn- Trong phng thc khi to, m cng 4445, thc t cng s bao nhiu

khng quan trng trong trng hp ny, v n ch gi n a ch multicast,c d liu t file one-liners.txt

- Phng thc getNextQuote() c tng dng d liu trong file, tr v gitr chui tm c hoc No more quote. Good bye! nu khng tm thy

Lp MultiserverThread:

- K tha t lp QuoteServerThread

- c tng dng d liu- Vi mi dng d liu th x l:

o Gi dng d liu n a ch multicast

o Tm dng mt thi gian (bi s ca 5) giy

Lp MulticastServer:

- To i tng MultiserverThread v start n

Lp MulticastClient:

- Tham gia vo group multicast ca a ch 230.0.0.1- Nhn d liu t server gi n

- Hin th n trn mn hnh

- Chng trnh client c thit k nhn 5 dng d liu

Trin khai:

MulticastServer.java

package Lab3.Cau2;

public class MulticastServer {public static void main(String args[]){


8/6/2019 Tran Anh Tuan_06T3_102103061149

29/34


try{

new MulticastServerThread().start();

}catch(java.io.IOException e){

}

}

}

MulticastServerThread.java

package Lab3.Cau2;

import java.io.*;

import java.net.*;

import java.util.*;

public class MulticastServerThread extends QuoteServerThread{

private long FIVE_SECONTS=5000;

public MulticastServerThread() throws IOException{

super("MulticastServerThread");

}

public void run(){

while(moreQoutes){

try{

byte []buf=new byte[256];

//contruct quote

String dString=null;

if(in==null)

dString=new Date().toString();

else

dString=getNextQoute();

buf=dString.getBytes();

InetAddress group=InetAddress.getByName("230.0.0.1");

DatagramPacket packet=new DatagramPacket(buf,buf.length,group,4446);

socket.send(packet);

//sleep for a while

try{sleep((long)(Math.random()*FIVE_SECONTS));


8/6/2019 Tran Anh Tuan_06T3_102103061149

30/34


}catch(InterruptedException e){}



moreQoutes=false;

}

}

socket.close();

}

}

QuoteServerThread.java

package Lab3.Cau2;

import java.io.*;

import java.net.*;

public class QuoteServerThread extends Thread{

protected DatagramSocket socket=null;

protected BufferedReader in=null;

protected boolean moreQoutes=true;

private static int TTL=128;

public QuoteServerThread()throws IOException{

this("QouteServerThread");

}

public QuoteServerThread(String name)throws IOException{

super(name);

socket=new DatagramSocket(4445);

try{

in=new BufferedReader(new FileReader("one-liners.txt"));

}catch(FileNotFoundException e){

System.out.println("Could not open qoute file. Serving time instead");

}

}

protected String getNextQoute(){

String returnValue=null;

try{

if((returnValue=in.readLine())==null){


8/6/2019 Tran Anh Tuan_06T3_102103061149

31/34


in.close();

moreQoutes=false;

returnValue="No more qoutes. Goodbye.";

}


returnValue="IOException occurred in server.";

}

return returnValue;

}

}

MulticastClient.java

package Lab3.Cau2;

import java.io.*;

import java.net.*;

import java.util.*;

public class MulticastClient {


MulticastSocket socket=new MulticastSocket(4445);

InetAddress address=InetAddress.getByName("203.0.0.1");

socket.joinGroup(address);

DatagramPacket packet;

//get a few qoute

for(int i=0;i

8/6/2019 Tran Anh Tuan_06T3_102103061149

32/34


Client

Server ch x l chui khng hin th nn khng a vo

Chng 3. KT LUN V HNG PHT TRIN

1. Nhng kt qu t c


8/6/2019 Tran Anh Tuan_06T3_102103061149

33/34


- Hiu r hn v TCP, UDP

- C th to mt chng trnh TCP, UDP n gin

- Kt qu ca chng trnh c th hin phn phn tch ca mi chngtrnh

2. Nhng vn tn ti

- Chng trnh c vit th cc tnh nng, nhiu lp cha thit k tt (lp

ch c mi hm main)

- Cha trin khai trn nhiu my tnh khc nhau

- Cha c giao din ha

3. Hng pht trin

- Thit k giao din ha

- Cc chng trnh TCP thit k multithread

- To cc phng thc cho mi chc nng, khng nn a ht v hm main


8/6/2019 Tran Anh Tuan_06T3_102103061149

34/34


LI CM N

- Hc phn thc hnh lp trnh mng gip chng em bit thm kin thc cn

bn v lp trnh. Kt hp nhiu my tnh li vi nhau to thnh mt h thng ln hn.

T kin thc cn bn lm nn tng c th tip thu thm kin thc, nng cao nng

lc bn thn.

- Em xin gi li cm n n thy Nguyn Vn Nguyn v cc thy c tn tnh

gip , hng dn lp trnh trong nhng lc kh khn.