中軟國際java預(yù)習(xí)材料核心14網(wǎng)絡(luò)通訊

2 Internet3

4包sSocket5通信是指：對語言、文字、聲音和 677 8在網(wǎng)絡(luò)尋找某一臺計算機都是依靠它的IP地址（用或9和就是兩個此類地址，第一個稱為缺省 包Java的網(wǎng)絡(luò)功能，其中包含了一InetAddressSocketServerSocket方法原 throwsUnknownHostExceptionthrowsUnknownHostExceptionthrowsUnknownHostExceptionthrowsUnknownHostException

在給定原始IP地址的情況下，返回InetAddress回其IP地址所組成的數(shù)組import.*publicclassInetAddressDemopublicstaticvoidmain(String[]args){try InetAddressadd1=InetAddress.getLocalHost(); 機："+add1); 解析，獲得相應(yīng)服務(wù)的主機地址InetAddressadd2=InetAddress.getByName("");System.out.println("網(wǎng)易服務(wù)器主機："+add2);InetAddressadd3=InetAddress.getByName("2");InetAddress.getByName("J104");System.out.println("機器名為J104的主機："+add4);}catch(UnknownHostExceptionuhe){uhe.printStackTrace();}} 返回此InetAddress對象的原始IP返回此InetAddress對象的IP返回此InetAddress

B

從socket中這 一旦Socket對象被成功創(chuàng)建，就可以獲得 voidclose()throws說明intint Socketaccept()throwsvoidclose()throwsSocket創(chuàng)建一個服務(wù)器套接字（ServerSocket），綁定到指調(diào)用accept方法，偵聽來自客戶端的請求，如果客戶調(diào)用Socket的getInputStream和getOutputStream方法，SocketServerSocket(intSocket

address,intport)privatestaticfinalintSERVER_PORT9001;//指定偵聽端口publicServer(){try Sockets=ss.accept();//偵聽來自客戶端的請求 InputStreamin=s.getInputStream(); OutputStreamout=s.getOutputStream();//獲得輸出流，用來發(fā)送數(shù)據(jù) byte[]buf=newbyte[1024];intlen=in.read(buf); StringstrFrom =newString(buf,0,len); String " in.close();out.close();//關(guān)閉輸入流和輸出流 }publicstaticvoidmain(String[]args){newServer();}public privatestaticfinalintSERVER_PORT=9001;//服務(wù)器的偵聽端口 (){try{//由于服務(wù)端也是運行在本機，所以創(chuàng)建本機的InetAddress對象InetAddressaddress=InetAddress.getByName("localhost"); Sockets=newSocket(address,SERVERPORT);//向服務(wù)器偵聽端口發(fā)出請 InputStreamin=s.getInputStream(); OutputStreamout=s.getOutputStream();//獲得輸出流，用來發(fā)送數(shù)據(jù) StringstrToServer="你好！";());byte[]buf=newbyte[1024];intlen=in.read(buf); StringstrFromServer=newString(buf,0,len);in.close();out.close();//關(guān)閉輸入流和輸出流 }catch(UnknownHostExceptionnhe){}catch(IOExceptionioe){}publicstaticvoidmain(String[]args){ ();} 調(diào)用DatagramSocket(intport)創(chuàng)建一個數(shù)據(jù)報套接字，并綁定調(diào)用DatagramPacket(byte[]buf,intlength)，建立一個字節(jié)數(shù)組以接收UDP包。調(diào)用DatagramSocket類的receive()，接收UDP包。調(diào)用DatagramPacket(byte[]buf,intoffset,intlength,InetAddressaddress,intport)，建立要發(fā)送的UDP包調(diào)用DatagramSocket類的send()，發(fā)送UDP包。TCP與UDP URL(UniformResourceLocator)----統(tǒng)一資源 URL組成:協(xié)議名和資源名protocol:resourceNameURL舉例:publicURL(Stringspec);例如：URLu1newURL(“”);publicURL(URLcontext,StringURLu2newURL(u1e.html”)publicURL(StringprotocolStringhostStringfile);URLu3newURL(“http”“developers/index.html”);publicURL(Stringprotocol,Stringhost,intport,Stringfile);URLu4newURL(“http”80,“developers/index.html”);URLpublicpublicclassURLConnectionReaderpublicstaticvoidmain(String[]args)throwsException{URLyahoo=newURL("");URLConnectionyc=yahoo.openConnection();BufferedReaderin=newnewInputStreamReader(yc.getInputStream()));StringinputLine;while((inputLine=in.readLine())!=null)}}出于效率的考慮，socket使用的是字節(jié)流，但是在實際操publicpublic{Sockets=newSocket(address,InputStreamis=s.getInputStream();InputStreamReaderisr=newInputStreamReader(is);BufferedReaderin=newBufferedReader(isr);