Java与C# socket通信

1. 字符集

Java与C#对于字符串的默认字符集都是Unicode，所以这里不需要自己手动统一字符编码；

2. 数据处理

Java字符串传值C#之后会在前后多出两个字符（2+2 = 4），这个原因暂时不清楚，可能是在传输过程中自动加的头尾吧【待续】，所以当C#接收到数据后，需要首位分别截掉两个字符；

3. 统一字符集（可选）

如果需要转变字符集，则可以通过以下操作统一：

// Java
private String convertUTFToGBK(String str) throws UnsupportedEncodingException {
        String returnStr;
        byte[] bytes = str.getBytes("gbk");// 这里输入需要的字符集名称（要求是Java支持的）
        returnStr = new String(bytes, "gbk");
        System.out.println("要发送的消息：" + returnStr+"【GBK】");
        return str;
    }

// C#
private string ConvertToGBK(byte[] data)
        {
            string returnStr;
            Encoding encoding = Encoding.GetEncoding("GBK");
            returnStr = encoding.GetString(data);
            return returnStr;
        }

4. 源码

// Java
public class SimpleSocketClientTest {
    private Socket clientSocket;
    private DataInputStream inStream;// 客户端的输入流为服务器端发来的消息
    private DataOutputStream outStream;// 客户端的输出流为发向服务器的消息

    public static void main(String[] args) {
        new SimpleSocketClientTest();
    }

    public SimpleSocketClientTest() {
        clientSocket = new Socket();
        connect("127.0.0.1", 8885);
        // monitor
        new Scanner(System.in).next();
    }

    // 连接服务器
    public void connect(String ip, int port) {
        SocketAddress host = new InetSocketAddress(ip, port);
        try {
            clientSocket.connect(host, 1000);
            System.out.println("连接服务器（" + clientSocket.getRemoteSocketAddress() + "）成功");
            inStream = new DataInputStream(clientSocket.getInputStream());
            outStream = new DataOutputStream(clientSocket.getOutputStream());
            System.out.println("输入/输出流创建成功");
            // 发送消息
            String sendMsg = "你好";
            System.out.println("要发的消息是：" + sendMsg+"【UTF-8】");
            sendListener(sendMsg);
        } catch (Exception e) {
            System.out.println("连接异常，检查网络设置。");
        }
    }

    private void sendListener(String strToSend) throws Exception {
        outStream.writeUTF(strToSend);
    }
}

// C#
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace ServerFirBlog
{
    class Program
    {
        private string ipAddr = "127.0.0.1";
        private int port = 8885;
        private IPEndPoint endPoint;
        private Socket serverSocket;
        private Socket client;
        Encoding encoding;

        static void Main(string[] args)
        {
            new Program().Launcher();
            Console.ReadKey();
        }

        private void Launcher()
        {
            encoding = Encoding.GetEncoding("GBK");
            endPoint = new IPEndPoint(IPAddress.Parse(ipAddr), port);
            serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            serverSocket.Bind(endPoint);
            serverSocket.Listen(0);
            AsyncAccept(serverSocket);
        }

        /// <summary>  
        /// 接收客户端连接
        /// </summary>  
        /// <param name="socket"></param>  
        private void AsyncAccept(Socket socket)
        {
            socket.BeginAccept(asyncResult =>
            {
                //获取客户端套接字  
                client = socket.EndAccept(asyncResult);
                Console.WriteLine(string.Format("客户端{0}请求连接...", client.RemoteEndPoint));
                AsyncReveive(client);
            }, null);
        }

        /// <summary>  
        /// 接收消息  
        /// </summary>  
        /// <param name="client"></param>  
        private void AsyncReveive(Socket socket)
        {
            byte[] data = new byte[1024];
            try
            {
                //开始接收消息  
                socket.BeginReceive(data, 0, data.Length, SocketFlags.None,
                asyncResult =>
                {
                    int length = socket.EndReceive(asyncResult);
                    string msgContent = Encoding.UTF8.GetString(data).Substring(2, length - 2);
                    Console.WriteLine(string.Format("客户端发送消息:{0}", msgContent));
                }, null);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}

5. 运行结果

不再展示（因为我懒