node.js 下 tcp socket 编程

// tcp_server.js
var net = require("net");

var HOST = "127.0.0.1"
var PORT = 9876
var BUFSIZE = 256
var buf = new Buffer(BUFSIZE);

// connection 's event prototype is function(sock), you can also use net.createServer( function(sock){ ... } );
// the funcetion pass to net.createServer becomes the event handler for 'connection' event;
// the sock object the call back function receive unique for each connection.
function onConnection(sock)
{
    console.log("connected :" + sock.remoteAddress + " " + sock.remotePort);
    // add a 'data' event handler to this instance of socker
    sock.on("data",function(buf)
    {
        console.log("data from clinet: " + sock.remoteAddress + " : " + buf.toString('utf8', 0, buf.length));
        // write back data to the connection of socket
        sock.write(buf.toString('utf8', 0, buf.length));
    });
    // add a 'close' event handler to this instance of socker
    sock.on("close",function(data)
    {
        console.log("closed " + sock.remoteAddress + " " + sock.remotePort);
    });
}

// create a server instance, you also can use another way,
/*
    var server = net.createServer();
    server.listen(PORT,HOST);
    server.on('connection',function(sock){...} );
*/
var server = net.createServer( false,onConnection );
// listen at PORT HOST
server.listen(PORT,HOST);

console.log("server listen on " + HOST + " : " + PORT);

// tcp_client.js
var net = require("net");

var HOST = "127.0.0.1"
var PORT = 9876
var BUFSIZE = 256
var buf = new Buffer(BUFSIZE);
var client = new net.Socket();
// open a connection for a gived socket
client.connect(PORT,HOST,function()
{
    console.log("connect to :" + HOST + " : " + PORT);
    // write data to server
    var len = buf.write("0123456789");
    console.log("data :" + buf.toString('utf8', 0, len));
    client.write(buf);
});
// add a 'data' event handler for the client socket,the callback funtion receive the data whick server give back
client.on("data",function(buf)
{
    console.log("data :" + buf.toString('utf8', 0, buf.length));
    client.write(buf);
});

// add a 'close' event handler for the client socket
client.on("close",function()
{
    console.log("connect closed!");
});

参考：

         Node.js v0.10.12 Manual & Documentation

         

         node 入门

         

        

         TCP Scoket programming in Node.js