Java（套接字）64 KB 限制

我正在使用套接字编写客户端服务器，文件传输工作但文件不超过 64 KB，为什么会这样以及如何处理它？

服务器

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket servsock = new ServerSocket(4444);
        File myFile = new File("D:\\Games\\Dog.mp3");
        long len = myFile.length();
        System.out.print(len);
        while (true) {
            Socket sock = servsock.accept();
            byte[] mybytearray = new byte[(int) myFile.length()];
            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(myFile));
            bis.read(mybytearray, 0, mybytearray.length);
            OutputStream os = sock.getOutputStream();
            os.write(mybytearray, 0, mybytearray.length);
            os.flush();
            sock.close();
        }
    }
}

客户

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.Socket;

public class Client {
    public static void main(String[] argv) throws Exception {
        Socket sock = new Socket("127.0.0.1", 4444);
        byte[] mybytearray = new byte[50000000];
        InputStream is = sock.getInputStream();
        FileOutputStream fos = new FileOutputStream("D:\\Dog.mpe");
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        System.out.println(mybytearray);
        System.out.println(mybytearray.length);
        int bytesRead = is.read(mybytearray, 0, mybytearray.length);
        bos.write(mybytearray, 0, bytesRead);
        bos.close();
        sock.close();
    }
}