Java和C#UDP通信有关问题

Java和C#UDP通信问题
Java作为UDP的服务器，
C#做为UDP的客户端。
源代码


package com.taoge.socke;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UDPEchoServer {
private static final int ECHOMAX=255;//max size of echo datagram

public static void main(String[] args) throws IOException {
/*
if(args.length!=1){
throw new IllegalArgumentException("Parameter(s):&lt;Port&gt;");
}
*/
//int servPort=Integer.parseInt(args[0]);
int servPort = 5555;

//1.创建一个DatagramSocket实例，指定本地端口号，可以选择指定本地地址
DatagramSocket socket=new DatagramSocket(servPort);
DatagramPacket packet=new DatagramPacket(new byte[ECHOMAX],ECHOMAX);

while(true){
//2.使用DatagramSocket的receive方法来接收一个DatagramPacket实例。
socket.receive(packet);
System.out.println("Handling client at "+packet.getAddress().getHostAddress()+" on port "+packet.getPort());
System.out.println("包的数据:" + new String(packet.getData()));
socket.send(packet);
packet.setLength(ECHOMAX);
//socket.close();
}
}
}

C#部分


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;

namespace ConsoleApplication1
{

    /**
     * C# 版本UDP客户端，用与连接Java服务器端发送数据。
     * */
    class Program
    {
       

        static void Main(string[] args)
        {
            int SenderPort = 5555;
            String host = "127.0.0.1";

            IPAddress ip = IPAddress.Parse(host);
            IPEndPoint ipepoit = new IPEndPoint(ip,SenderPort);

            UdpClient udpClient = new UdpClient(SenderPort);
            udpClient.Connect(ip,SenderPort);

            Byte[] sendByts = Encoding.ASCII.GetBytes("welcome to chengdu!!");

            //udpClient.Send(sendByts,sendByts.Length);
            udpClient.Send(sendByts, 255);
            //IPEndPoint RemoteIpEndPoint = new IPEndPoint(ip, 0);

            //Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
            //string returnData = Encoding.ASCII.GetString(receiveBytes);

            //Console.WriteLine("This is the message you received " + returnData.ToString()); 
 
            //Console.WriteLine("This message was sent from " + RemoteIpEndPoint.Address.ToString() + " on their port number " + RemoteIpEndPoint.Port.ToString());
            Console.WriteLine("发送数据完毕!!");
            udpClient.Close();

        }
    }
}

现在是C# 给Java发送消息，Java这段收不到消息。

Java给Java发送没有问题，C# 给C#发送也没有问题，现在就是C#发送给Java有问题。
[解决办法]
用mina做
[解决办法]
我喜欢用socket,原滋原味哈，Java没做修改，C#稍改了一下,Java端可以收到数据。


            int SenderPort = 5555;
            String host = "127.0.0.1";
            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Parse(host),SenderPort);

            Byte[] sendByts = Encoding.ASCII.GetBytes("welcome to chengdu!!");
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            socket.SendTo(sendByts,sendByts.Length, SocketFlags.None, RemoteIpEndPoint);
            

            Console.WriteLine("发送数据完毕!!");
            socket.Close();

[解决办法]
应该消息是接收到的，只是C#发送过来时Java不知道哪里是消息帧的分界点而仍然缓存在消息队列里。

Java和C#UDP通信有关问题

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