[英]Node.js: send message to server
我在我的服務器上運行以下node.js:
var net=require('net');
var util=require('util');
var server=net.createServer(function(conn){
conn.on('connect',function(){
util.puts('connect');
});
conn.on('data',function(data){
util.puts(data);
});
});
server.listen(5000,'172.16.1.197');
這工作得很好,我可以telnet到172.16.1.197:5000,它的行為符合預期。
現在,我有一個客戶端在另一個IP地址為172.16.1.218的盒子上運行,我只是想向服務器發送一條消息。
function sendAMessage(payLoad){
//what to put in here?
}
payLoad應該打印在服務器端。
我知道這看起來很簡單,但我真的無法理解它 - 我對node.js很新。
提前謝謝了,
添加一些代碼:
這是客戶端(172.16.1.218):
var http = require('http');
var util=require('util');
var net=require('net');
var localHash={};
var chunkLength=100;
http.createServer(function(request, response) {
var proxy = http.createClient(80, request.headers['host'])
var proxy_request = proxy.request(request.method, request.url, request.headers);
proxy_request.addListener('response', function (proxy_response) {
proxy_response.addListener('data', function(x) {
var responseData=x.toString("binary");
var bytes=getBytes(responseData);
util.puts(bytes.length);
for(var i=0;i<bytes.length;i++){
var hash=DJBHash(bytes[i]);
//util.puts(hash);
if(hash in localHash){
//in hash, send alias
//response.write("<EOH>"+hash+"</EOH>",'binary');
response.write(bytes[i],'binary');
}else{
//not in hash, send full chunk
updateRemoteHash(hash,bytes[i]);
response.write(bytes[i],'binary');
localHash[hash]=bytes[i];
}
}
//response.write(bytes,"binary");
});
proxy_response.addListener('end', function() {
response.end();
});
response.writeHead(proxy_response.statusCode, proxy_response.headers);
});
request.addListener('data', function(chunk) {
util.puts(chunk);
proxy_request.write(chunk, 'binary');
});
request.addListener('end', function() {
proxy_request.end();
});
}).listen(8080,'172.16.1.218');
function getBytes(responseData){
var f=chunkLength;
var toTransmit="";
var p=0;
var bytes=Array();
var N=responseData.length;
if(N>f){
p=Math.floor(N/f);
var hash="";
var chunk="";
for(var i=0;i<p;i++){
chunk=responseData.substr(f*i,f);
toTransmit=toTransmit+chunk;
bytes[i]=chunk;
/*hash=DJBHash(chunk);
if(localHash[hash]==undefined){
localHash[hash]=chunk;
//updateRemoteHash(hash,chunk);
toTransmit=toTransmit+chunk;
}else{
sys.puts("***hit"+chunk);
toTransmit=toTransmit+chunk;//"***EOH"+hash;
}*/
}
//remainder:
chunk=responseData.substr(f*p);
toTransmit=toTransmit+chunk;
bytes[p]=chunk;
/*hash=DJBHash(chunk);
if(localHash[hash]==undefined){
localHash[hash]=chunk;
//updateRemoteHash(hash,chunk);
toTransmit=toTransmit+chunk;
}else{
toTransmit=toTransmit+chunk;//"***EOH"+hash;
}*/
}else{
toTransmit=responseData;
bytes[0]=responseData;
}
return bytes;
}
function DJBHash(str) {
var hash = 5381;
for(var i = 0; i < str.length; i++) {
hash = (((hash << 5) + hash) + str.charCodeAt(i)) & 0xffffffff;
}
if(hash<-1){
hash=hash*-1;
}
return hash;
}
function updateRemoteHash(hash,chunk){
var c=net.createConnection(5000,'172.16.1.197');
c.on('connect',function(){
c.write(hash);
c.end();
});
}
和服務器端(172.16.1.197):
var net=require('net');
var util=require('util');
var server=net.createServer(function(conn){
conn.on('connect',function(){
util.puts('connect');
});
conn.on('data',function(data){
util.puts(data);
});
});
server.listen(5000,'172.16.1.197');
您已使用net.createServer
來設置TCP服務器。 您現在需要使用net.createConnection
連接到TCP服務器。
function sendAMessage(msg) {
var c = net.createConnection(5000, '172.16.1.218');
c.on("connect", function() {
// connected to TCP server.
c.write(msg);
});
}
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