使用相同的网络流和套接字连接从C#客户端向Java服务器发送多字节[]时挂起

我编写了一个文件上传器，旨在将一个程序代码文件从C#客户端发送到Java服务器。服务器要求在接受文件上载之前提交有效的用户名和密码。

独立地，安全性（用户名和密码）和文件上传器都能正常工作。然而，当我尝试将两者结合时，在从服务器收到"true"布尔响应（指示正确的用户名和密码）后，代码在C#客户端上冻结。附带了来自客户端和服务器的相关代码。

C#客户端

public static string sendValidatedFile(string username, string password, string path) {
        string inputString = "NotSent";
        try {
            TcpClient client = new TcpClient("127.0.0.1", 42000);
            StreamReader input = new StreamReader(stream);
            Stream securityStream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(username + "_" + password + "_'n"));
            byte[] bufferA = new byte[securityStream.Length];
            securityStream.Read(bufferA, 0, bufferA.Length);
            stream.Write(bufferA, 0, bufferA.Length);
            stream.Flush();
            inputString = input.ReadToEnd();
            bool result = bool.Parse(inputString);
            if (result) {
                print("Login Accepted");
                Stream fileStream = File.OpenRead(path);
                byte[] buffer = new byte[fileStream.Length];
                fileStream.Read(buffer, 0, buffer.Length);
                // This is where the code seems to lock up
                stream.Write(buffer, 0, buffer.Length);
                stream.Flush();
                inputString = input.ReadToEnd();
            }
            else {
                inputString = "Invalid Username or Password";
            }
            input.Close();
            stream.Close();
            client.Close();
        }
        catch (SocketException e) {
            print("Error" + e);
        }
        catch (IOException e) {
            print("Error" + e);
        }
        return inputString;
    }

Java服务器

public void run() {
try {
  // Get username and password
    byte[] byteArrayJAR = new byte[filesize];
    byte[] byteArraySecurity = new byte[filesize];
    InputStream input = socket.getInputStream();
    PrintWriter output = new PrintWriter(socket.getOutputStream());
    int bytesSecurity = input.read(byteArraySecurity, 0, byteArraySecurity.length);
    int currentByte1 = bytesSecurity;
    if (input.available() > 0) {
        do {
            bytesSecurity = input.read(
                    byteArraySecurity,
                    currentByte1,
                    (byteArraySecurity.length - currentByte1));
            if (bytesSecurity >= 0) {
                currentByte1 += bytesSecurity;
            }
        }
        while (bytesSecurity > -1);
    }
    String securityString = new String(byteArraySecurity).trim();
    String[] authenticationString = securityString.split("_");
    String username = authenticationString[0];
    String password = authenticationString[1];
  // Validate the username and password with a stored database
    if (security.validateUser(username, password)) {
       // Inforn the client their username and password were accepted
        output.println(true);
        output.flush();
      // Get the program code file
        int bytesRead = input.read(byteArrayJAR, 0, byteArrayJAR.length);
        int currentByte = bytesRead;
       if (input.available() > 0) {
                do {
                   bytesRead = input.read(
                     byteArrayJAR,
                            currentByte,
                            (byteArrayJAR.length - currentByte));
                if (bytesRead >= 0) {
                        currentByte += bytesRead;
                    }
             }
                 while (bytesRead > -1);
     }
      // Inform the client that the code was received
        output.println("Success");
        output.flush();
    }
    else {
      // Inform the client their username or password was incorrect
        output.println(false);
        output.flush();
    }
  // Disconnect from client
    output.flush();
    output.close();
    input.close();
    socket.close();
}
catch (IOException e) {
    e.printStackTrace();
}

}

有人能看到上面的任何错误，可能导致我的代码挂起吗？C#客户端在两个实例上都有传输的数据。在C#中，两个字节数组不能从同一个网络流发送是有原因的吗？

我很感激任何人能提供任何帮助，让上面的代码在不挂起的情况下工作。

问候，

Midavi。