尝试通过与客户端和服务器的Java UDP套接字连接发送图像时，Image = Null错误

Question

因此，我正在尝试编写代码以实现通过客户端和服务器在Java中以字节为单位逐个字节发送的图像。 This is the jist of the assignment

这是服务器的代码：

import java.io.*;
import java.net.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;

class UDPServer {
   public static void main(String args[]) throws Exception
   {
   DatagramSocket serverSocket = new DatagramSocket(9876);                                               //makes the datagram socket at the port 9876 for dat transfer 
   byte[] receiveData = new byte[1024];                                                                  //allocate memory for data being recieved
   byte[] sendData = new byte[1024];                                                                     //allocate memory for data being sent
   byte[] buffer = new byte[1024];

   DatagramPacket receiveByte = new DatagramPacket(buffer, buffer.length);
   serverSocket.receive(receiveByte);
   byte[] data = receiveByte.getData();
   ByteArrayInputStream bais = new ByteArrayInputStream(data);
   BufferedImage image2 = ImageIO.read(bais);
   ImageIO.write(image2, "bmp", new File("C:\\Users\\Demon FFA\\Documents\\Network Design\\Phase 2\\word1.bmp"));
   System.out.println("Image receieved!"); 

以下是客户端代码：

import java.io.*;
import java.net.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;

class UDPClient {
   public static void main(String args[]) throws Exception
      {
         BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));            //create input stream for client to server message
         DatagramSocket clientSocket = new DatagramSocket();                                          //create the socket for the client
         InetAddress IPAddress = InetAddress.getByName("localhost");                                  //change the hostname into an ip address with DNS
         byte[] sendData = new byte[1024];                                                            //allocate memory for data being sent
         byte[] receiveData = new byte[1024];                                                         //allocate memory for the data being recieved


      BufferedImage image = ImageIO.read(new File("C:\\Users\\Demon FFA\\Documents\\Network Design\\Phase 2\\word.bmp"));
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      ImageIO.write(image, "bmp", baos);
      //baos.flush();
      byte[] data = baos.toByteArray();
      byte[] buffer = new byte[1024];
      int i;
      int c = 0;

      for(i = 0; i<data.length; i++) {
        buffer[c] = data[i];
        c++;
        if (i%1024==0){
        c = 0;
        }
        DatagramPacket sendByte  = new DatagramPacket(buffer, buffer.length, IPAddress, 9876);
        clientSocket.send(sendByte);
    } 
  }
}

这是错误：

CMD Error: Image= Null