java - 使用套接字编程将数据从Java发送到C

Question

我正在编写一个程序，使用 WinSock2 将字符串从 Java 客户端发送到 C 服务器。我正在使用 DataOutputStream 通过套接字发送数据。

C 服务器确认接收到的字节，但是当我尝试访问数据时，没有任何显示。

服务器

Socket socket = null;
    DataOutputStream dataOutputStream = null;
    DataInputStream dataInputStream = null;
 try {
  socket = new Socket("10.40.0.86", 2007);
  dataOutputStream = new DataOutputStream(socket.getOutputStream());
  dataInputStream = new DataInputStream(socket.getInputStream());
  //dataOutputStream.writeUTF("How are you doing let us see what is the maximum possible length that can be supported by the protocal");
  String line = "hey";
  dataOutputStream.writeUTF(line);
  dataOutputStream.flush();

  //System.out.println(dataInputStream.readLine());
  System.out.println((String)dataInputStream.readLine().replaceAll("[^0-9]",""));
  //System.out.println(dataInputStream.readInt());
  //System.out.println(dataInputStream.readUTF());
 } catch (UnknownHostException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }

客户

if (socket_type != SOCK_DGRAM)
            {
                retval = recv(msgsock, Buffer, sizeof(Buffer), 0);
                printf("Server: Received datagram from %s\n", inet_ntoa(from.sin_addr));

            }

输出

Server: Received 5 bytes, data "" from client
BUFFER :
Server: Echoing the same data back to client...
BUFFER :
Server: send() is OK.

Answer 1

您的 C 代码需要理解 writeUTF() 写入的数据格式(请参阅 Javadoc)，或者更简单地说，您需要在 Java 端使用 write(char[]) 或 write(byte[])。