《Java TCP/IP Socket編程》讀書筆記(10)

3.5.3.3
基於文本編解碼和UDP通訊端

用戶端

package com.suifeng.tcpip.chapter3.vote;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.util.Arrays;/** * UDP 用戶端 *  * @author Suifeng *  */public class VoteUDPClient{// 逾時時間private static final int TIMEOUT = 3000;// 最大串連次數private static final int MAXTRIES = 5;public static void main(String[] args) throws IOException{if (args.length != 3){throw new IllegalArgumentException("Paramters:<Server> <Port> <Candidate>");}// 伺服器位址InetAddress serverAddress = InetAddress.getByName(args[0]);// 伺服器連接埠int serverPort = Integer.parseInt(args[1]);// 候選人編號int candidate = Integer.parseInt(args[2]);// UDP用戶端DatagramSocket socket = new DatagramSocket();socket.connect(serverAddress, serverPort);// 接收資料阻塞時間socket.setSoTimeout(TIMEOUT);System.out.println("UDP 用戶端已建立....");VoteMsg vote = new VoteMsg(false, false, candidate, 0);VoteMsgCoder coder = new VoteMsgTextCoder();byte[] encodeVote = coder.toWire(vote);System.out.println("Sending Text-encode Request (" + encodeVote.length + "bytes)");System.out.println(vote);DatagramPacket message = new DatagramPacket(encodeVote, encodeVote.length);socket.send(message);message = new DatagramPacket(new byte[VoteMsgTextCoder.MAX_WIRE_LENGTH], VoteMsgTextCoder.MAX_WIRE_LENGTH);socket.receive(message);encodeVote = Arrays.copyOfRange(message.getData(), 0, message.getData().length);System.out.println("Received Text-encoded Response ("+encodeVote.length+" bytes)");vote = coder.fromWire(encodeVote);System.out.println(vote);}}

伺服器端

package com.suifeng.tcpip.chapter3.vote;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.SocketException;import java.util.Arrays;/** * UDP伺服器端 *  * @author Suifeng *  */public class VoteUDPServer{// 最大顯示數組位元組數private static final int ECHO_MAX = 255;public static void main(String[] args) throws IOException{if (args.length != 1){throw new IllegalArgumentException("Parameter:<Port>");}// 伺服器連接埠int serverPort = Integer.parseInt(args[0]);// 伺服器端DatagramSocket socket = new DatagramSocket(serverPort);System.out.println("UDP伺服器已啟動....");VoteMsgCoder coder = new VoteMsgTextCoder();VoteService service = new VoteService();byte[] inBuffer =new byte[VoteMsgTextCoder.MAX_WIRE_LENGTH];while (true){System.out.println("正在等待用戶端發送資料....");// 資料報DatagramPacket packet = new DatagramPacket(inBuffer, inBuffer.length);// 接收用戶端發送的資料(阻塞)socket.receive(packet);byte[] encodeMsg = Arrays.copyOfRange(packet.getData(), 0, packet.getData().length);System.out.println("Handing request from "+packet.getSocketAddress()+ " ("+encodeMsg.length+")");VoteMsg msg = coder.fromWire(encodeMsg);msg = service.handleRequest(msg);packet.setData(coder.toWire(msg));System.out.println("Sending Resoponse ("+packet.getLength()+" bytes");System.out.println(msg);socket.send(packet);}}}

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