我可以只用插座Java和C＃之间的沟通？ [英] Can I communicate between Java and C# using just sockets?

问题描述

更具体地说，如果一台计算机有我可以使用C＃系统连接到它的服务器（的java.net.ServerSocket 实例）。 Net.Sockets.Socket 实例？

More specifically, if a computer has a server (a java.net.ServerSocket instance) can I connect to it using a C# System.Net.Sockets.Socket instance?

推荐答案

的主要问题是，你需要非常小心，你发送和接收数据的编码。这是一对一起工作的程序。 C＃的客户机发送一个字符串，由第一发送其长度为一个整数，然后发送字符串本身的字节。 Java服务器读取的长度，然后读取信息并打印输出到控制台。然后构成一个回声消息，计算其长度，提取字节并将其发送回到C＃客户端。客户端读取的长度，该消息并打印输出。应该有避免一切按位的东西的一种方式，但说实话我有点生锈的这个东西，尤其是在Java端。

The main issue is that you need to be very careful with the encoding of the data that you send and receive. Here is a pair of programs that work together. The C# client sends a string, by first sending its length as an integer, and then sending the bytes of the string itself. The Java server reads the length, then reads the message and prints an output to the console. Then composes an echo message, computes its length, extracts the bytes and sends it back to the C# client. The client reads the length, the message and prints an output. There should be a way to avoid all the bitwise stuff, but honestly I'm a little rusty with this stuff, especially on the Java side.

一个Java服务器：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class JavaSocket {

    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = new ServerSocket(4343, 10);
        Socket socket = serverSocket.accept();
        InputStream is = socket.getInputStream();
        OutputStream os = socket.getOutputStream();

        // Receiving
        byte[] lenBytes = new byte[4];
        is.read(lenBytes, 0, 4);
        int len = (((lenBytes[3] & 0xff) << 24) | ((lenBytes[2] & 0xff) << 16) |
                  ((lenBytes[1] & 0xff) << 8) | (lenBytes[0] & 0xff));
        byte[] receivedBytes = new byte[len];
        is.read(receivedBytes, 0, len);
        String received = new String(receivedBytes, 0, len);

        System.out.println("Server received: " + received);

        // Sending
        String toSend = "Echo: " + received;
        byte[] toSendBytes = toSend.getBytes();
        int toSendLen = toSendBytes.length;
        byte[] toSendLenBytes = new byte[4];
        toSendLenBytes[0] = (byte)(toSendLen & 0xff);
        toSendLenBytes[1] = (byte)((toSendLen >> 8) & 0xff);
        toSendLenBytes[2] = (byte)((toSendLen >> 16) & 0xff);
        toSendLenBytes[3] = (byte)((toSendLen >> 24) & 0xff);
        os.write(toSendLenBytes);
        os.write(toSendBytes);

        socket.close();
        serverSocket.close();
    }
}

一个C＃客户端：

using System;
using System.Net;
using System.Net.Sockets;

namespace CSharpSocket
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            string toSend = "Hello!";

            IPEndPoint serverAddress = new IPEndPoint(IPAddress.Parse("192.168.0.6"), 4343);

            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            clientSocket.Connect(serverAddress);

            // Sending
            int toSendLen = System.Text.Encoding.ASCII.GetByteCount(toSend);
            byte[] toSendBytes = System.Text.Encoding.ASCII.GetBytes(toSend);
            byte[] toSendLenBytes = System.BitConverter.GetBytes(toSendLen);
            clientSocket.Send(toSendLenBytes);
            clientSocket.Send(toSendBytes);

            // Receiving
            byte[] rcvLenBytes = new byte[4];
            clientSocket.Receive(rcvLenBytes);
            int rcvLen = System.BitConverter.ToInt32(rcvLenBytes, 0);
            byte[] rcvBytes = new byte[rcvLen];
            clientSocket.Receive(rcvBytes);
            String rcv = System.Text.Encoding.ASCII.GetString(rcvBytes);

            Console.WriteLine("Client received: " + rcv);

            clientSocket.Close();
        }
    }
}

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