NodeJS v6.2.2 - TCP 服务器从客户端的字符串消息中接收到额外的空格答案

【问题标题】：NodeJS v6.2.2 - TCP server receives extra blank spaces from client's string messageNodeJS v6.2.2 - TCP 服务器从客户端的字符串消息中接收到额外的空格
【发布时间】：2016-10-20 13:28:51
【问题描述】：

我开始学习 NodeJS，但遇到了一些初学者问题。

这是我的简单 TCP 服务器代码：

const net = require('net');
const StringDecoder = require('string_decoder').StringDecoder;


const PORT = 9000;
const ADDRESS = '127.0.0.1';

const server = net.createServer((socket) => {
    socket.on('data', (chunk) => {
        const decoder = new StringDecoder('utf8');
        const message = Buffer.from(chunk);
        console.log(decoder.write(message + ' length:' + message.length));
    });
}).listen(PORT, ADDRESS);

console.log('Server running at: %s:%s', ADDRESS, PORT);

server.on('connection', (socket) => {
    var playerAddress = socket.remoteAddress.toString() +':'+ socket.remotePort.toString();
    console.log('Player connected: %s', playerAddress);
});

还有 C# 客户端应用程序：

using System;
using System.Net.Sockets;

namespace SimpleTCPClient
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpClient client = new TcpClient("127.0.0.1", 9000);
            try
            {
                using (NetworkStream stream = client.GetStream())
                {
                    string message = "Borko";
                    byte[] bytes = new byte[message.Length * sizeof(char)];
                    System.Buffer.BlockCopy(message.ToCharArray(), 0, bytes, 0, bytes.Length);

                    stream.Write(bytes, 0, bytes.Length);
                }
            }
            catch (ObjectDisposedException)
            {
                Console.WriteLine("Lost connection to the server.");
            }
            catch (InvalidOperationException)
            {
                Console.WriteLine("Application isn't connected to the server.");
            }
            finally
            {
                client.Close();
            }

        }
    }
}

运行服务器和客户端应用程序后，我得到了以下输出：

我找不到那些空白的解决方案。请帮忙。谢谢！

【问题讨论】：

标签： c# node.js tcp

【解决方案1】：

你把字符串转换成字节数组的方式不对，下面的代码修复了你的多余空间问题：

using System;
using System.Net.Sockets;

namespace SimpleTCPClient
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpClient client = new TcpClient("127.0.0.1", 9000);
            try
            {
                using (NetworkStream stream = client.GetStream())
                {
                    string message = "Borko";
                    byte[] bytes = Encoding.UTF8.GetBytes(message);

                    stream.Write(bytes, 0, bytes.Length);
                }
            }
            catch (ObjectDisposedException)
            {
                Console.WriteLine("Lost connection to the server.");
            }
            catch (InvalidOperationException)
            {
                Console.WriteLine("Application isn't connected to the server.");
            }
            finally
            {
                client.Close();
            }

        }
    }
}

【讨论】：