从Java发送文件到C＃ [英] Send a file from Java to C#

问题描述

我想从Java服务器发送一个二进制文件到C＃的客户端。这里的code我使用的是：

I want to send a binary file from a Java server to a C# client. Here's the code I'm using:

Java服务器：

    ServerSocket serverSocket = new ServerSocket(1592);
    Socket socket = serverSocket.accept();
    PrintWriter out = new PrintWriter(socket.getOutputStream(),true);

    File file = new File("img.jpg");

    //send file length
    out.println(file.length());

    //read file to buffer
    byte[] buffer = new byte[(int)file.length()];
    DataInputStream dis = new DataInputStream(new FileInputStream(file));
    dis.read(buffer, 0, buffer.length);

    //send file
    BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
    bos.write(buffer);
    bos.flush();

    Thread.sleep(2000);

C＃客户端：

        //connect to server
        TcpClient tcpClient = new TcpClient();
        tcpClient.Connect("127.0.0.1", 1592);
        NetworkStream networkStream = tcpClient.GetStream();

        StreamReader sr = new StreamReader(networkStream);

        //read file length
        int length = int.Parse(sr.ReadLine());
        Console.WriteLine("File size: {0} bytes", length);

        //read bytes to buffer
        byte[] buffer = new byte[length];
        networkStream.Read(buffer, 0, (int)length);

        //write to file
        BinaryWriter bWrite = new BinaryWriter(File.Open("C:/img.jpg", FileMode.Create));
        bWrite.Write(buffer);

        bWrite.Flush();
        bWrite.Close();

这code似乎只写第69696字节的文件。从那里，它只会写0，直到结束。

This code only seems to write the first 69696 bytes of the file. From there it will only write 0 until the end.

任何提示？

感谢

推荐答案

从的 MSDN ：因为是可用的，直到由大小参数指定的字节数读操作读取尽可能多的数据

From MSDN: "Read operation reads as much data as is available, up to the number of bytes specified by the size parameter."

这意味着，当你要求，你需要检查你的自我，直到你，你希望得到尽可能多的数据，你不一定得到尽可能多的数据。

That means that you don't necessarily get as much data as you request, you need to check your self until you got as much data as you expect.

int toRead = (int)length;
int read = 0;
while (toRead > 0)
{
    int noChars = networkStream.Read(buffer, read, toRead);
    read += noChars;
    toRead -= noChars;
}

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