udp的发送数据和接收数据

         String ip = (String) SPUtils.get(IP_INFO, defaultIp, this);

    
         //获取本地ip地址
    
         InetAddress receiverHost = InetAddress.getByName(ip);
    
         byte[] titleByte = new byte[2];
    
         titleByte[0] = (byte)0xa0;
    
         titleByte[1] = (byte)0x9f;
    
         //卡号，ticketCode转换为byte类型
    
         byte[] ticketCodeByte = ticketCode.getBytes();
    
         //byte类型卡号的长度
    
         Integer ticketCodeLength = ticketCodeByte.length;
    
         //byte类型卡号的长度转换为byte类型
    
         byte[] ticketCodeLen = ticketCodeLength.toString().getBytes();
    
         //姓名转换为byte类型
    
         byte[] nameByte = name.getBytes();
    
         //byte类型姓名的长度
    
         Integer length = nameByte.length;
    
         //byte类型姓名的长度转换为byte类型
    
         byte[] nameLen = length.toString().getBytes();
    
         //图片url转换为byte类型
    
         byte[] headImgUrlByte = headImgUrl.getBytes();
    
         //byte类型图片url的长度
    
         Integer length1 = headImgUrlByte.length;
    
         //byte类型图片url的长度转换为byte类型
    
         byte[] headImgUrlLen = length1.toString().getBytes();
    
  
    
         byte[] info = new byte[titleByte.length+ticketCodeLen.length+ticketCodeByte.length
    
                                 +nameLen.length+nameByte.length+headImgUrlLen.length+headImgUrlByte.length];
    
  
    
         System.arraycopy(titleByte,0,info,0,titleByte.length);
    
         System.arraycopy(ticketCodeLen,0,info,titleByte.length,ticketCodeLen.length);
    
         System.arraycopy(ticketCodeByte,0,info,titleByte.length+ticketCodeLen.length,ticketCodeByte.length);                     System.arraycopy(nameLen,0,info,titleByte.length+ticketCodeLen.length+ticketCodeByte.length,nameLen.length);                  System.arraycopy(nameByte,0,info,titleByte.length+ticketCodeLen.length+ticketCodeByte.length+nameLen.length,nameByte.length);            System.arraycopy(headImgUrlLen,0,info,titleByte.length+ticketCodeLen.length+ticketCodeByte.length+nameLen.length+nameByte.length,headImgUrlLen.length);            System.arraycopy(headImgUrlByte,0,info,titleByte.length+ticketCodeLen.length+ticketCodeByte.length+nameLen.length+nameByte.length+headImgUrlLen.length,headImgUrlByte.length);
    
  
    
         mySocket = new DatagramSocket(Udp_port_send);//你的端口号
    
         //receiverHost:接收方的ip地址，Udp_port_send：接收方的端口号
    
         DatagramPacket pack = new DatagramPacket(info, info.length, receiverHost, Udp_port_send);
    
         mySocket.send(pack);
    
         mySocket.close();
    
    
    
    
    AI写代码

 socket = MainApplication.getInstance().getMyDatagramSocket();

 byte[] receiveBuffer = new byte[1000];

 DatagramPacket datagram = new DatagramPacket(receiveBuffer, 1000);

 byte[] databyte = socket.receive(datagram);

 //断开连接

 //创建一个容量为databyte.length字节的ByteBuffer

 ByteBuffer buffer = ByteBuffer.allocate(databyte.length);

 buffer.order(ByteOrder.LITTLE_ENDIAN);

 //向ByteBuffer中输入数据（.wrap() 或 .put()）

 // put(byte[])在给定的字节数组写入字节到当前位置,并将position+1

 buffer.put(databyte);

 buffer.flip();

 byte[] resultBytes = new byte[1];

 buffer.get(resultBytes);

 int resultLen = Integer.parseInt(new String(resultBytes));

 byte[] a = new byte[resultLen];

 buffer.get(a);

 String result = new String(a, "utf-8");

  
  

AI写代码