Android-->UDP协议的Socket数据传输

来源：互联网发布：金猪报喜源码下载编辑：程序博客网时间：2024/05/01 13:33

阅读之前,你已经了解了UDP的相关知识;

UDP数据传输时,数据包的大小是有限制的65535, 大概是64k的内容

当数据太大时,需要分包机制,后续补充…如果你有更好的分包方法,请分享给我~谢谢!

接收端的代码:

public class UdpServerThread2 extends Thread {    public static final PrintStream p = System.out;    private static final int DATA_LEN = 1228800;    public static String serverIp = "192.168.124.78";    public static int serverPort = 8089;    private static Object lock = new Object();    private final SaveFileThread fileThread;    byte[] data;    DatagramSocket socket;    private boolean isExit = false;    private UdpServerThread2() throws SocketException {        //创建一个 socket,监听 serverPort端口        socket = new DatagramSocket(serverPort);        //创建一个保存数据到文件的线程,非必须        fileThread = new SaveFileThread();        fileThread.start();    }    //启动方法    public static void main(String... args) {        try {            new UdpServerThread2().start();        } catch (SocketException e) {            e.printStackTrace();        }    }    @Override    public void run() {        while (!isExit) {            data = new byte[DATA_LEN];            //创建一个用于接收数据的数据包对象,需要指定长度            DatagramPacket packet = new DatagramPacket(data, DATA_LEN);            try {                p.println("等待中...");                //等待接收数据...                socket.receive(packet);//                String s = new String(data);//                p.println("收到数据包:" + s + " 大小:" + packet.getLength() + " 字节" + " 长度:" + s.length());                p.println("收到数据包大小:" + packet.getLength() + " 字节");                //将数据保存到文件                fileThread.saveData(data, packet.getLength());            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 保存文件的线程     */    class SaveFileThread extends Thread {        private Vector<byte[]> saveData;        private volatile int length;        public SaveFileThread() {            this.saveData = new Vector<>();            File png = new File("png");            if (!png.exists()) {                png.mkdirs();            }        }        private String getSaveFileName() {            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH-mm-ss-SSS");            String format = simpleDateFormat.format(new Date());            return (format + ".png");        }        public void saveData(byte[] data, int len) {            saveData.add(data);            length = len;        }        @Override        public void run() {            while (!isExit) {                if (!saveData.isEmpty()) {                    byte[] data = saveData.remove(0);                    try {                        String fileName = getSaveFileName();                        FileOutputStream outputStream = new FileOutputStream(new File("png" + File.separator + fileName));                        outputStream.write(data, 0, length);                        outputStream.close();                        p.println("保存至:-->" + fileName);                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }    }}

发送端的代码

public class UdpSendThread extends Thread {    private static Object lock = new Object();    private static UdpSendThread sendThread;    private volatile boolean isExit = false;    private Vector<int[]> sendDataInt;    private Vector<byte[]> sendDataByte;    private DatagramSocket socket;    private int port = 8089;    private String ip = "192.168.124.78";    private UdpSendThread() {        sendDataInt = new Vector<>();        sendDataByte = new Vector<>();        try {            socket = new DatagramSocket();        } catch (SocketException e) {            e.printStackTrace();        }    }    public static UdpSendThread getInstance() {        if (sendThread == null) {            synchronized (lock) {                if (sendThread == null) {                    sendThread = new UdpSendThread();                    sendThread.start();                }            }        }        return sendThread;    }    /**     * 将int数值转换为占四个字节的byte数组，本方法适用于(低位在前，高位在后)的顺序。 和bytesToInt（）配套使用     *     * @param value 要转换的int值     * @return byte数组     */    public static byte[] intToBytes(int value) {        byte[] src = new byte[4];        src[3] = (byte) ((value >> 24) & 0xFF);        src[2] = (byte) ((value >> 16) & 0xFF);        src[1] = (byte) ((value >> 8) & 0xFF);        src[0] = (byte) (value & 0xFF);        return src;    }    /**     * byte数组中取int数值，本方法适用于(低位在前，高位在后)的顺序，和和intToBytes（）配套使用     *     * @param src    byte数组     * @param offset 从数组的第offset位开始     * @return int数值     */    public static int bytesToInt(byte[] src, int offset) {        int value;        value = (int) ((src[offset] & 0xFF)                | ((src[offset + 1] & 0xFF) << 8)                | ((src[offset + 2] & 0xFF) << 16)                | ((src[offset + 3] & 0xFF) << 24));        return value;    }    public static byte[] intsToBytes(int[] values) {        byte[] src = new byte[4 * values.length];        for (int i = 0; i < values.length; i++) {            byte[] bytes = intToBytes(values[i]);            for (int j = 0; j < bytes.length; j++) {                src[i * 4 + j] = bytes[j];            }//            System.arraycopy(bytes, 0, src, i * 4, bytes.length);        }        return src;    }    public void send(int[] data) {        try {            //数据类型的转换            byte[] bytes = intsToBytes(data);            //创建一个数据包,包含数据,端口,目标地址            DatagramPacket packet = new DatagramPacket(bytes, bytes.length);            packet.setPort(port);            packet.setAddress(InetAddress.getByName(ip));            //发送...            socket.send(packet);        } catch (IOException e) {            e.printStackTrace();        }    }    public void send(byte[] data) {        sendDataByte.add(data);    }    public void exit() {        isExit = true;    }    @Override    public void run() {        while (!isExit) {//            if (!sendDataInt.isEmpty()) {//                int[] data = sendDataInt.remove(0);////            }            if (!sendDataByte.isEmpty()) {                try {                    byte[] data = sendDataByte.remove(0);                    DatagramPacket packet = new DatagramPacket(data, data.length);                    packet.setPort(port);                    packet.setAddress(InetAddress.getByName(ip));                    socket.send(packet);                    System.out.println("发送数据长度:" + data.length + "字节");                } catch (UnknownHostException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}

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