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[ʥ˼԰][Java SE]Network

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? γĿ C Java ϵͳ C ʹjava.netеӿڽ C ʹJavaһ̨̨֮ лTCP/IPЭͨѶ C ΪJ2EEѧϰ׼
? ̵ĿľֱָӻӵͨЭ ͨѶ Ҫ⣬һ׼ȷĶλһ̨ ̨һҵοɿЧ Ľݴ䡣TCP/IPЭIPҪ Ķλݴ·ɣIPַ ΨһȷInternetϵһ̨TCP ṩӦõĿɿĻǿɿݴ ƣ̵Ҫһ㲻Ҫ IPδݵ
? ĿǰΪеģǿͻ/ C/Sṹͨ˫һΪ ȴͻӦͻ Ҫʱ롣 ʼУ˿ڣһпͻ 󣬾ͻһ߳Ӧÿ ͬʱԼ˿ڣʹ ĿͻҲܼʱõ
Э Э A B 192.168.0.118 192.168.0.200
? IPÿ̨һΩһIP ַ ? IPַһ߼ַ ? ϵIPַȫΨһԣ ? 32λ4ֽڣõʮƵĸʽ ʾ磺192.168.0.200
? Ϊеݽͨţ Ĺ򡢱׼Լ(=+﷨+ ) ? ͬиԲͬЭ顣
? ͨý顪ߡߡ ? ͬ豸ͨáרá ? ͬIJϵͳUnixWindows ? ͬӦû̶ƶ ? ͬҵࡪʱʵʱ ? ͶʺͻۡΡΡ ? ûҵԡִĵ ? ǻཻ֯γ˷dzӵϵͳӦû
? ϵṹʹЩòͬý ͬ豸ϵͳڲͬӦûʵֻ ԣҵһճϼ Ӫһ֡ռ䡱 κγ̵κ ԼκμֻҪռΪ 򣬾ܹ沢չ ? ϵṹõǷֲ㷽 Ѹӵ绥⻮Ϊɸ Сġһ⣬ڲͬԽ ? ڱʱֽΪܶСģ һ
? OSI(Open System Interconnection)οģͽIJ ܻͬΪ7 Ӧò Ӧ ʾ ݱʾ Ự ͨ ˵˵ Ѱַ· · ʷ() ƴ
? ͨʵĶԵȲ֮䲻ֱͨš ? ֮ϸ ? ϲʹ²ṩķ Service user ? ²ϲṩ Service provider
? ԵȲʵ֮ͨš ? ²ϲṩʵͨײ
? Ӧò㣺Զ̵¼ЭTelnetļЭ FTP ıЭHTTPDNS ʼЭSMTPʾЭPOP3ȡ ? 㣺ЭTCPûݱЭ UDP TCPӵĿɿĴЭ顣 UDPӵģɿĴЭ顣 ? 㣺ЭIPInternetƱ ЭICMPInternetЭIGMP
? TCPTransfer Control Protocolļƣ һӵı֤ɿЭ顣 ͨTCPЭ鴫䣬õһ˳ ͷͽշijɶԵ socket֮뽨ӣԱ TCPЭĻϽͨţһ socketͨserver socketȴ ʱһsocketҪ ӣһsocketǾ Խ˫ݴ䣬˫Խ ͻղ
? TCPһӵЭ飬ܹṩ ̨֮Ŀɿ . HTTP FTPTelnetӦöҪֿɿͨ ͨ
? UDPUser Datagram Protocolļƣ һӵЭ飬ÿݱһ ϢԴַĿ ַκοܵ· Ŀĵأܷ񵽴ĿĵأĿ صʱԼݵȷԶDzܱ ֤
? UDPǴһ̨һ̨ ΪݱĶݰЭ飬Э ֤ݱǷȷصĿĵء һӵЭ
? ǶЭ򵥱Ƚ C ʹUDPʱÿݱжĵ ַϢҪͷͽշ ӡ C TCPЭ飬һӵЭ飬 socket֮ݴ֮ǰȻҪ ӣTCPжһӽʱ
C ʹUDPʱдСƵģÿ ݱ޶64KB֮ڡ C TCPûⷽƣһӽ ˫socketͿ԰ͳһĸʽ ݡ C UDPһɿЭ飬ͷ͵ ݱһͬĴ򵽴շ C TCPһɿЭ飬ȷշȫ ȷػȡͷ͵ȫ
? TCPͨмǿԶ ӣTelnetļ䣨FTP Ҫȵݱɿش䡣 ? ֮UDP򵥣ҽҪ ļ໤ͨھ߿ɿԵ ɢϵͳclient/serverӦó
? Ȼ˱֤ɿTCPЭ飬Ϊʲô ҪǿɿıٱЭأ
? Ҫԭ C һǿɿĴҪ۵ģ ȷԵļȻռüĴʱ ĴTCPЧʲUDP C ӦвҪ֤ϸĴ ԣƵϵͳҪƵƵ ݾԵȷֻҪ֤ԾͿˣ ȻʹUDPһЩ
? ڻϴݶʶ ĿĵصIPַͶ˿ںšIPַ ʶϵļ˿ںָ ϵӦó
? ˿һֳṹһЩݽṹI/O Ӧóͨϵͳij˿ڽ binding󣬴㴫ö˿ڵݶӦĽ գӦ̷ݶͨö˿ ? ˿һͱʶʾ˿ںš˿ںŸЭ أTCP/IPЭTCPUDPȫ ģ飬˸ԵĶ˿ںҲ໥˿ ͨΪЭ˿(protocol port) ƶ˿ڡ ? ˿ʹһ16λʾķΧ0~65535 1024µĶ˿ںűԤķ磺httpʹ 80˿ڡ
? һ̨Ҫݵһ̨ ȱĹ̳Ϊװ ? װǰضЭͷ Эͷ
? οģУԵȲЭ֮佻ϢԪͳΪ ЭݵԪ(PDUProtocol Data Unit) ? οģÿһ㶼Ҫһṩķ ? Ϊṩ²ϲPDUΪݷװ Ȼ뱾ͷβͷкݴ ĿϢ ? ϶µݽĹʵϾDzϷװĹ ̡Ŀĵغ¶ϵݽĹ̾DzϲĹ ̡ɴ˿֪·ϴݣʵ ˶㡰ŷ⡱ ? ǣijһֻʶɶԵȲװġŷ⡱ װڡŷ⡱ڲݽDzύ 㣬㲻κδ
? TCP/IPԴ߼о滮 (DARPA)һоƻʵ̨ ໥ͨš ? TCP/IPѳΪInternetͨŵĹҵ ׼ ? TCP/IPģͰ4Σ C Ӧò C C C ӿ
οģ TCP/IPģ 7 Ӧò 6 ʾ Ӧò 5 Ự 4 3 2 · ӿ 1
? ͨjava.netе࣬javaܹʹ TCPUDPЭڻϽͨѶ ? Java ͨչеʽ/ӿ Ͻ/ ֧TCP/IP ? Java֧TCPUDPЭ塣TCP Ŀɿʽ/UDPָ֧ ġٵġԵݱģʽ
? URL(Uniform Resource Locator)ͳһ ԴλļƣʾInternetij һԴĵַͨURLǿԷ InternetϵĸԴ WWWFTPվ㡣ͨ URLϲӦļ Դ
? URLΪֱ۵һ綨λʹ URLǵϰߣ׼䣬 Ӧʮֹ㷺ĿǰʹΪ 㷺TCP/IPжURLĽ ҲЭһ׼ν ʹURḶҪ Э鱾̫˽⣬ҲȽ ԶDZȽϼ򵥵ġ
? һURL Ҫ֣ C ЭʶHTTPFTPFile C Դ֣ļ˿ںţ ? 磺 ? http://java.sun.com:80/docs/books/tutorial/index. html#DOWN
? URL C JavaУԴʾURLַURL URLʾһURLַURL þURLURLͲURL
? URL C 磺http://www.gamelan.com/pages/index..html C new URL("http://www.gamelan.com/pages/index.html"); C URL gamelan = new URL("http://www.gamelan.com/pages/"); C URL gamelanGames = new URL(gamelan, "game.html"); C new URL("http", "www.gamelan.com", "/pages/index.html"); C new URL("http", "www.gamelan.com", 80, "pages/index.network.html");
? URL C ʧܣ C try C { C URL myURL = new URL(. . .) C } catch (MalformedURLException e) C { C . . . C // exception handler code here C . . . C }
? μ Url1.java C URLĸ C getProtocol C getHost C getPort C getFile C getRef
? ΪURLʵʱػϢ openConnection( )һ URLConnection£ ? url.openConnection() ? openConnection( ) ijʽ ? URLConnection openConnection( ) ? URLأһ URLConnection IOException쳣
? URLConnectionǷԶԴԵһ ;ࡣ㽨Զ̷֮ ӣڴ֮ǰ URLConnectionԶ̶ԡ ЩHTTPЭ淶岢ҽ HTTPЭURL
? μ UrlConnection1.java C URLURLConnectionϣHTTP ȡϢļ򵥳˵Ƿ õ ? μUrlConnection2.java ? μUrlConnection3.java C Ƚϸ΢ ? μUrlConnection4.java
? ڴ绰ʼ InternetӣַǻInetAddress װǰ۵ʽIPַ ͸õַͨһIP ෢ãIPIPַ ⡣ ? InetAddress ڲ˵ַ֡
? C InetAddress ûԵĹ캯Ϊһ InetAddress󣬱һõĹ C factory methodһо̬ һʵԼ InetAddress getLocalHost( ) getByName( )ԼgetAllByName( ) InetAddressʵ
C static InetAddress getLocalHost( ) C throws UnknownHostException C static InetAddress getByName(String hostName) C throws UnknownHostException C static InetAddress[ ] getAllByName(String hostName) C throws UnknownHostException
? getLocalHost( )InetAddress ? getByName( )һ InetAddress ? Щܽһ UnknownHostException쳣 ? Internetϣһdz е¡getAllByName( )شһ ƷֽеַInetAddresses 顣ڲܰƷֽһַʱ һUnknown HostException쳣
? μ InetAddress1.java
? ʲôSocket? ? ʹSocketͨŵĹ ? ʹServerSocketSocketʵַ˺Ϳ ˵ Socketͨ ? ʵֶַ֧ͻ
? ΪܹĿӦ ѧUnixƳһӦóͨЭ IJϵͳsocket(׽)socketij ֣ʹԱԺܷطTCP/IPӶ Ӧõij ? UnixӦƹ㣬׽ڱд õ˼ռ׽ֱ WindowsȲϵͳСJavaҲ ֱģ͡
? ʲôSocket? Socketϵ˫ ͨѶĶ˵
ʹSocketͨŵĹ ? һ׽ְ󶨵һضĶ˿ڣͨ ׽ֵȴͼͻ ? ͻݷڵͶ˿ںŷ
ʹSocketͨŵĹ ? һ󡣲һ µİ󶨵ͬ˿ڵַ׽֡ ? ͻͷͨд׽ֽͨѶ
? ʹServerSocketSocketʵַ ˺Ϳͻ˵ Socketͨ
? ʹServerSocketSocketʵַ˺Ϳͻ ˵ Socketͨ ܽ᣺ 1) Socket 2) / 3/д 4) ر/ 5) رSocket
? μ Tcp1.java ? μ EchoServer.java ? μ EchoClient.java
? ʵֶַ֧ͻͨ ? ˵ijҪΪÿһͻ ӵsocketһ̣߳ͬʱͨ ŵ⡣ ? μ EchoServer1.java ? μ EchoServerThread.java ? μ EchoClient.java
? ʲôDatagram C ݱϴĶݰ ݱǷ ȷصĿĵأʱ䣬˳ ݵȷԾûбϡ ? javaʹDatagram DatagramPacket ? DatagramSocketUDPЭʵ ͻSocket. ? send():ݱ ? receive(): ݱ
DatagramSocket(); DatagramPacket(buf,len); DatagramPacket(buf,len); DatagramPacket(buf,len,address, port); socket.receive(packet); socket.send(packet); packet.getAddress(); packet.getPort(); DatagramPacket(buf,len,address, port); DatagramPacket(buf,len); socket.send(packet); socket.receive(packet);
? μ Udp1.java ? μ QuoteServer.java ? μ QuoteServerThread.java ? μ QuoteClient.java

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[ʥ˼԰][Java SE]Network

  • 1. All Rights Reserved
  • 2. ? γĿ C Java ϵͳ C ʹjava.netеӿڽ C ʹJavaһ̨̨֮ лTCP/IPЭͨѶ C ΪJ2EEѧϰ׼
  • 3. ? ̵ĿľֱָӻӵͨЭ ͨѶ Ҫ⣬һ׼ȷĶλһ̨ ̨һҵοɿЧ Ľݴ䡣TCP/IPЭIPҪ Ķλݴ·ɣIPַ ΨһȷInternetϵһ̨TCP ṩӦõĿɿĻǿɿݴ ƣ̵Ҫһ㲻Ҫ IPδݵ
  • 4. ? ĿǰΪеģǿͻ/ C/Sṹͨ˫һΪ ȴͻӦͻ Ҫʱ롣 ʼУ˿ڣһпͻ 󣬾ͻһ߳Ӧÿ ͬʱԼ˿ڣʹ ĿͻҲܼʱõ
  • 5. Э Э A B 192.168.0.118 192.168.0.200
  • 6. ? IPÿ̨һΩһIP ַ ? IPַһ߼ַ ? ϵIPַȫΨһԣ ? 32λ4ֽڣõʮƵĸʽ ʾ磺192.168.0.200
  • 7. ? Ϊеݽͨţ Ĺ򡢱׼Լ(=+﷨+ ) ? ͬиԲͬЭ顣
  • 8. ? ͨý顪ߡߡ ? ͬ豸ͨáרá ? ͬIJϵͳUnixWindows ? ͬӦû̶ƶ ? ͬҵࡪʱʵʱ ? ͶʺͻۡΡΡ ? ûҵԡִĵ ? ǻཻ֯γ˷dzӵϵͳӦû
  • 9. ? ϵṹʹЩòͬý ͬ豸ϵͳڲͬӦûʵֻ ԣҵһճϼ Ӫһ֡ռ䡱 κγ̵κ ԼκμֻҪռΪ 򣬾ܹ沢չ ? ϵṹõǷֲ㷽 Ѹӵ绥⻮Ϊɸ Сġһ⣬ڲͬԽ ? ڱʱֽΪܶСģ һ
  • 10. ? OSI(Open System Interconnection)οģͽIJ ܻͬΪ7 Ӧò Ӧ ʾ ݱʾ Ự ͨ ˵˵ Ѱַ· · ʷ() ƴ
  • 11. ? ͨʵĶԵȲ֮䲻ֱͨš ? ֮ϸ ? ϲʹ²ṩķ Service user ? ²ϲṩ Service provider
  • 13. ? Ӧò㣺Զ̵¼ЭTelnetļЭ FTP ıЭHTTPDNS ʼЭSMTPʾЭPOP3ȡ ? 㣺ЭTCPûݱЭ UDP TCPӵĿɿĴЭ顣 UDPӵģɿĴЭ顣 ? 㣺ЭIPInternetƱ ЭICMPInternetЭIGMP
  • 14. ? TCPTransfer Control Protocolļƣ һӵı֤ɿЭ顣 ͨTCPЭ鴫䣬õһ˳ ͷͽշijɶԵ socket֮뽨ӣԱ TCPЭĻϽͨţһ socketͨserver socketȴ ʱһsocketҪ ӣһsocketǾ Խ˫ݴ䣬˫Խ ͻղ
  • 15. ? TCPһӵЭ飬ܹṩ ̨֮Ŀɿ . HTTP FTPTelnetӦöҪֿɿͨ ͨ
  • 16. ? UDPUser Datagram Protocolļƣ һӵЭ飬ÿݱһ ϢԴַĿ ַκοܵ· Ŀĵأܷ񵽴ĿĵأĿ صʱԼݵȷԶDzܱ ֤
  • 17. ? UDPǴһ̨һ̨ ΪݱĶݰЭ飬Э ֤ݱǷȷصĿĵء һӵЭ
  • 18. ? ǶЭ򵥱Ƚ C ʹUDPʱÿݱжĵ ַϢҪͷͽշ ӡ C TCPЭ飬һӵЭ飬 socket֮ݴ֮ǰȻҪ ӣTCPжһӽʱ
  • 19. C ʹUDPʱдСƵģÿ ݱ޶64KB֮ڡ C TCPûⷽƣһӽ ˫socketͿ԰ͳһĸʽ ݡ C UDPһɿЭ飬ͷ͵ ݱһͬĴ򵽴շ C TCPһɿЭ飬ȷշȫ ȷػȡͷ͵ȫ
  • 20. ? TCPͨмǿԶ ӣTelnetļ䣨FTP Ҫȵݱɿش䡣 ? ֮UDP򵥣ҽҪ ļ໤ͨھ߿ɿԵ ɢϵͳclient/serverӦó
  • 21. ? Ȼ˱֤ɿTCPЭ飬Ϊʲô ҪǿɿıٱЭأ
  • 22. ? Ҫԭ C һǿɿĴҪ۵ģ ȷԵļȻռüĴʱ ĴTCPЧʲUDP C ӦвҪ֤ϸĴ ԣƵϵͳҪƵƵ ݾԵȷֻҪ֤ԾͿˣ ȻʹUDPһЩ
  • 23. ? ڻϴݶʶ ĿĵصIPַͶ˿ںšIPַ ʶϵļ˿ںָ ϵӦó
  • 24. ? ˿һֳṹһЩݽṹI/O Ӧóͨϵͳij˿ڽ binding󣬴㴫ö˿ڵݶӦĽ գӦ̷ݶͨö˿ ? ˿һͱʶʾ˿ںš˿ںŸЭ أTCP/IPЭTCPUDPȫ ģ飬˸ԵĶ˿ںҲ໥˿ ͨΪЭ˿(protocol port) ƶ˿ڡ ? ˿ʹһ16λʾķΧ0~65535 1024µĶ˿ںűԤķ磺httpʹ 80˿ڡ
  • 25. ? һ̨Ҫݵһ̨ ȱĹ̳Ϊװ ? װǰضЭͷ Эͷ
  • 26. ? οģУԵȲЭ֮佻ϢԪͳΪ ЭݵԪ(PDUProtocol Data Unit) ? οģÿһ㶼Ҫһṩķ ? Ϊṩ²ϲPDUΪݷװ Ȼ뱾ͷβͷкݴ ĿϢ ? ϶µݽĹʵϾDzϷװĹ ̡Ŀĵغ¶ϵݽĹ̾DzϲĹ ̡ɴ˿֪·ϴݣʵ ˶㡰ŷ⡱ ? ǣijһֻʶɶԵȲװġŷ⡱ װڡŷ⡱ڲݽDzύ 㣬㲻κδ
  • 27. ? TCP/IPԴ߼о滮 (DARPA)һоƻʵ̨ ໥ͨš ? TCP/IPѳΪInternetͨŵĹҵ ׼ ? TCP/IPģͰ4Σ C Ӧò C C C ӿ
  • 28. οģ TCP/IPģ 7 Ӧò 6 ʾ Ӧò 5 Ự 4 3 2 · ӿ 1
  • 29. ? ͨjava.netе࣬javaܹʹ TCPUDPЭڻϽͨѶ ? Java ͨչеʽ/ӿ Ͻ/ ֧TCP/IP ? Java֧TCPUDPЭ塣TCP Ŀɿʽ/UDPָ֧ ġٵġԵݱģʽ
  • 30. ? URL(Uniform Resource Locator)ͳһ ԴλļƣʾInternetij һԴĵַͨURLǿԷ InternetϵĸԴ WWWFTPվ㡣ͨ URLϲӦļ Դ
  • 31. ? URLΪֱ۵һ綨λʹ URLǵϰߣ׼䣬 Ӧʮֹ㷺ĿǰʹΪ 㷺TCP/IPжURLĽ ҲЭһ׼ν ʹURḶҪ Э鱾̫˽⣬ҲȽ ԶDZȽϼ򵥵ġ
  • 32. ? һURL Ҫ֣ C ЭʶHTTPFTPFile C Դ֣ļ˿ںţ ? 磺 ? http://java.sun.com:80/docs/books/tutorial/index. html#DOWN
  • 33. ? URL C JavaУԴʾURLַURL URLʾһURLַURL þURLURLͲURL
  • 34. ? URL C 磺http://www.gamelan.com/pages/index..html C new URL("http://www.gamelan.com/pages/index.html"); C URL gamelan = new URL("http://www.gamelan.com/pages/"); C URL gamelanGames = new URL(gamelan, "game.html"); C new URL("http", "www.gamelan.com", "/pages/index.html"); C new URL("http", "www.gamelan.com", 80, "pages/index.network.html");
  • 35. ? URL C ʧܣ C try C { C URL myURL = new URL(. . .) C } catch (MalformedURLException e) C { C . . . C // exception handler code here C . . . C }
  • 36. ? μ Url1.java C URLĸ C getProtocol C getHost C getPort C getFile C getRef
  • 37. ? ΪURLʵʱػϢ openConnection( )һ URLConnection£ ? url.openConnection() ? openConnection( ) ijʽ ? URLConnection openConnection( ) ? URLأһ URLConnection IOException쳣
  • 38. ? URLConnectionǷԶԴԵһ ;ࡣ㽨Զ̷֮ ӣڴ֮ǰ URLConnectionԶ̶ԡ ЩHTTPЭ淶岢ҽ HTTPЭURL
  • 39. ? μ UrlConnection1.java C URLURLConnectionϣHTTP ȡϢļ򵥳˵Ƿ õ ? μUrlConnection2.java ? μUrlConnection3.java C Ƚϸ΢ ? μUrlConnection4.java
  • 40. ? ڴ绰ʼ InternetӣַǻInetAddress װǰ۵ʽIPַ ͸õַͨһIP ෢ãIPIPַ ⡣ ? InetAddress ڲ˵ַ֡
  • 41. ? C InetAddress ûԵĹ캯Ϊһ InetAddress󣬱һõĹ C factory methodһо̬ һʵԼ InetAddress getLocalHost( ) getByName( )ԼgetAllByName( ) InetAddressʵ
  • 42. C static InetAddress getLocalHost( ) C throws UnknownHostException C static InetAddress getByName(String hostName) C throws UnknownHostException C static InetAddress[ ] getAllByName(String hostName) C throws UnknownHostException
  • 43. ? getLocalHost( )InetAddress ? getByName( )һ InetAddress ? Щܽһ UnknownHostException쳣 ? Internetϣһdz е¡getAllByName( )شһ ƷֽеַInetAddresses 顣ڲܰƷֽһַʱ һUnknown HostException쳣
  • 45. ? ʲôSocket? ? ʹSocketͨŵĹ ? ʹServerSocketSocketʵַ˺Ϳ ˵ Socketͨ ? ʵֶַ֧ͻ
  • 46. ? ΪܹĿӦ ѧUnixƳһӦóͨЭ IJϵͳsocket(׽)socketij ֣ʹԱԺܷطTCP/IPӶ Ӧõij ? UnixӦƹ㣬׽ڱд õ˼ռ׽ֱ WindowsȲϵͳСJavaҲ ֱģ͡
  • 48. ʹSocketͨŵĹ ? һ׽ְ󶨵һضĶ˿ڣͨ ׽ֵȴͼͻ ? ͻݷڵͶ˿ںŷ
  • 49. ʹSocketͨŵĹ ? һ󡣲һ µİ󶨵ͬ˿ڵַ׽֡ ? ͻͷͨд׽ֽͨѶ
  • 50. ? ʹServerSocketSocketʵַ ˺Ϳͻ˵ Socketͨ
  • 51. ? ʹServerSocketSocketʵַ˺Ϳͻ ˵ Socketͨ ܽ᣺ 1) Socket 2) / 3/д 4) ر/ 5) رSocket
  • 52. ? μ Tcp1.java ? μ EchoServer.java ? μ EchoClient.java
  • 53. ? ʵֶַ֧ͻͨ ? ˵ijҪΪÿһͻ ӵsocketһ̣߳ͬʱͨ ŵ⡣ ? μ EchoServer1.java ? μ EchoServerThread.java ? μ EchoClient.java
  • 54. ? ʲôDatagram C ݱϴĶݰ ݱǷ ȷصĿĵأʱ䣬˳ ݵȷԾûбϡ ? javaʹDatagram DatagramPacket ? DatagramSocketUDPЭʵ ͻSocket. ? send():ݱ ? receive(): ݱ
  • 55. DatagramSocket(); DatagramPacket(buf,len); DatagramPacket(buf,len); DatagramPacket(buf,len,address, port); socket.receive(packet); socket.send(packet); packet.getAddress(); packet.getPort(); DatagramPacket(buf,len,address, port); DatagramPacket(buf,len); socket.send(packet); socket.receive(packet);
  • 56. ? μ Udp1.java ? μ QuoteServer.java ? μ QuoteServerThread.java ? μ QuoteClient.java