java 網路（socket）

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本文梳理一個基礎的java TCP訊息通訊，構造一個簡單的Packet進行傳輸，代碼如下：

• Packet

public class Packet {    private String attribute;        public Packet(String attr){        this.attribute = attr;    }        public String getAttribute() {        return attribute;    }    public void setAttribute(String attribute) {        this.attribute = attribute;    }}

• 伺服器端代碼

public class App {        private static final int PORT = 4000;    public static void main(String[] args) throws IOException {                ServerSocket listen = new ServerSocket(PORT);        Socket          client = null;        while(true){            client = listen.accept();            new Thread(new ServerThread(client)).start();        }    }}

public class ServerThread implements Runnable{        private static final int BUFSIZE  =1024;    private Socket client = null;        public ServerThread(Socket client){        this.client = client;    }        @Override    public void run() {        try {            InputStream in      = client.getInputStream();            OutputStream out = client.getOutputStream();                         byte[] buffer = new byte[BUFSIZE];                               while (in.read(buffer) != -1) {                //判斷包頭                if(buffer[0] == 0x01 && buffer[1] == 0x02){                    byte[] tmp = new byte[BUFSIZE];                    int index = 0;                    for(int i = 2; i < buffer.length; i++){                        tmp[index++] = buffer[i];                    }                                        Packet packet = new Packet(new String(tmp,"GB2312"));                                        System.out.println(packet.getAttribute());                }else{                    System.out.println("訊息格式不正確");                }            }                        out.close();            in.close();                    } catch (IOException e) {            e.printStackTrace();        }        }}

• 用戶端代碼

public class App {        private static final int PORT = 4000;    private static final int BUFSIZE  =1024;    public static void main(String[] args) throws IOException {                Socket client = new Socket("127.0.0.1", PORT);                InputStream in      = client.getInputStream();        OutputStream out = client.getOutputStream();                Packet packet = new Packet("型別參數2345");                    byte[] output = new byte[BUFSIZE];        output[0] = 0x01;        output[1] = 0x02;                int index = 2;        //若增加包長度欄位，則可實現packet的分包、組包        byte[] tmp1 = packet.getAttribute().getBytes();        for(int i= 0; i < tmp1.length; i++){            output[index++] = tmp1[i];        }                                            out.write(output);                byte[] buffer = new byte[BUFSIZE];        while (in.read(buffer) != -1) {              System.out.println(new String(buffer, "GB2312"));        }                out.close();        in.close();        client.close();                }}

java 網路（socket）