java通过socket通讯发送excel文件到c#端，excel文件乱码
java端socket，发送excel文件字节流

public boolean sendExcel() {
Socket socket;
ServerSocket ss;
DataOutputStream ps;
byte[] sendBytes = null;
try {
ss = new ServerSocket(this.port);
socket = ss.accept();
ps = new DataOutputStream(socket.getOutputStream());
fileinputstream = new FileInputStream(this.file);
sendBytes = new byte[fileinputstream.available()];
while (true) {
int read = 0;
if (fileinputstream != null) {
read = fileinputstream.read(sendBytes);
}
if (read == -1) {
break;
}
ps.write(sendBytes, 0, read);
}
Thread.sleep(5000);
ps.flush();
System.out.println("文件发送完成");
return true;
} catch (Exception e1) {
e1.printStackTrace();
return false;
}
}

c#客户端(控制台)，接收excel字节流，并保存为文件

   class Program
    {
        static void Main(string[] args)
        {
            string host;
            int port;
            string path;
            try
            {
            //int port = 2000;
            //string host = "127.0.0.1";
            lable:
                Console.Write("设定服务端ip：");
                //"127.0.0.1:2000"
                // host = Console.ReadLine();
                host = "192.168.0.221";
                Console.Write("设定服务端port：");
                //port = Int32.Parse(Console.ReadLine()); 
 
                port = 2000;
                Console.WriteLine("服务端的socket地址为：{0}:{1}", host, port);

                //创建终结点EndPoint
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip, port);   //把ip和端口转化为IPEndPoint的实例

                //创建Socket并连接到服务器
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);   //  创建Socket
                Console.WriteLine("Connecting...");
                try
                {
                    c.Connect(ipe); //连接到服务器
                }
                catch (Exception e)
                {
                    Console.WriteLine("连接失败，需重试!");
                    goto lable;
                }


                //向服务器发送信息
                string sendStr = "Hello,this is a socket test";
                byte[] bs = Encoding.UTF8.GetBytes(sendStr);   //把字符串编码为字节

                Console.WriteLine("Send message"); 
 
                c.Send(bs, bs.Length, 0); //发送信息

                //接受从服务器返回的信息
                string recvStr = "";
                byte[] recvBytes = new byte[1048576];
                int bytes;
                StreamWriter writer;

                Console.Write("请输入要保存的文件名：");
                path = Console.ReadLine();
                writer = new StreamWriter(path, false, System.Text.Encoding.UTF8);
                //writer = new StreamWriter(path, false, System.Text.Encoding.Default);
                //while(true)
                {
                    bytes = c.Receive(recvBytes, recvBytes.Length, 0);    //从服务器端接受返回信息
                    recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
                    //recvStr += Encoding.UTF8.GetString(recvBytes, 3, bytes-3);
                    //保存文件
                   // Console.WriteLine("client get message:{0}", recvStr);    //回显服务器的返回信息
                }
                writer.Write(recvStr);
                writer.Close();
                Console.ReadLine(); 
 
                //一定记着用完Socket后要关闭
                c.Close();

            }
            catch (ArgumentException e)
            {
                Console.WriteLine("argumentNullException:{0}", e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("SocketException:{0}", e);
            }
            Console.WriteLine("按任意键结束");
            Console.ReadLine();
        }
    }

[解决办法]
bytes = c.Receive(recvBytes, recvBytes.Length, 0);
FileStream fsOut = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
fsOut.Write(recvBytes, 0, bytes);
fsOut.Close();