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2013年7月18日 星期四

Data Synchronization Update

標題：同步變更數據
Node.JS (getdata.js)：
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var server,
ip = "127.0.0.1",
port = 1337,
http = require("http"),
url = require("url"),
fs = require("fs"),
qs = require("querystring");
var textPath = "p.txt";
server = http.createServer(function (req, res) {
var polling = {
timeover : false,
timeout : null,
request : function(q) {
this.timeout = setTimeout(function() {
polling.timeover = true;
}, 10000);
this.action(q);
},
action : function(q) {
if(this.timeover == true) { //確認連線逾時
q.callback({});
} else {
fs.readFile(textPath, "utf-8", function(err, file) {
if(q.json.lastTime < qs.parse(file).lastTime) { //有新資料
q.callback(qs.parse(file));
} else { //駐列輪巡
setTimeout(function() { polling.action(q) }, 100);
}
});
}
}
};
switch(url.parse(req.url).pathname) {
case "/jquery":
fs.readFile("js/jquery-1.9.1.js", function (err, data) {
if(err) throw err;
res.writeHead(200, {"Content-Type": "text/javascript", "Content-Length":data.length});
res.write(data);
res.end();
});
break;
case "/index":
fs.readFile("index.html", function (err, data) {
if(err) throw err;
res.writeHead(200, {"Content-Type": "text/html", "Content-Length":data.length});
res.write(data);
res.end();
});
break;
case "/sendData":
var sendData = "";
var lastTime = new Date().getTime();
req.setEncoding("utf8");
req.addListener("data", function(sendDataChunk) {
sendData += sendDataChunk;
});
req.addListener("end", function() {
sendData += "&lastTime=" + lastTime;
fs.open(textPath, "w", 0644, function(err, fd) {
if(err) throw err;
fs.write(fd, sendData, 0, "utf8", function(err) {
if(err) throw err;
fs.closeSync(fd);
var json = JSON.stringify({lastTime: lastTime});
res.writeHead(200, {
"Content-Type": "text/json",
"Content-Length": json.length
});
console.log(json);
res.end(json);
})
});
});
break;
case "/getData":
var getData = "";
req.setEncoding("utf8");
req.addListener("data", function(getDataChunk) {
getData += getDataChunk;
});
req.addListener("end", function() {
polling.request({
json : qs.parse(getData),
callback : function(data) {
var json = JSON.stringify(data);
res.writeHead(200, {
"Content-Type": "text/json",
"Content-Length": json.length
});
res.end(json);
}
});
});
break;
default:
res.writeHead(200, {"Content-Type": "text/html"});
res.write("Page not found.");
res.end();
break;
}
});
server.listen(port);
console.log("Server running at http://" + ip + ":" + port);
HTML (index.html)：
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-TW" xml:lang="zh-TW">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
<script src="/jquery"></script>
<script type="text/javascript">
$(function() {
var localurl = window.location.protocol + "//" + window.location.host;
var lastTime = 0;
$("#sendBtn").click(function() {
var username = $("#username").val();
var xValue = $("#xValue").val();
var yValue = $("#yValue").val();
var zValue = $("#zValue").val();
$.post("/sendData", {user: username, x: xValue, y: yValue, z: zValue},
function(data) {
console.log("Message Send on " + data.lastTime);
}, "json");
});
var pollingData = function() {
$.ajax({
cache: false,
dataType: "json",
type: "POST",
url: localurl + "/getData",
data: {lastTime: lastTime},
error: function (xhr, status, error) {
document.write("Error");
},
success: function (json) {
//console.log(json);
if(!$.isEmptyObject(json)) { //判斷內容是否為空
console.log("Update...");
//lastTime = new Date().getTime();
$("#username").val(json.user);
$("#xValue").val(json.x);
$("#yValue").val(json.y);
$("#zValue").val(json.z);
lastTime = json.lastTime;
pollingData();
} else { //繼續輪巡
console.log("Pulling...");
pollingData();
}
}
});
};
pollingData();
});
</script>
</head>
<body>
name: <input type="text" id="username" value="QQBoxy" /><br />
x: <input type="text" id="xValue" value="3" /><br />
y: <input type="text" id="yValue" value="4" /><br />
z: <input type="text" id="zValue" value="5" /><br />
<button id="sendBtn">Send</button>
</body>
</html>
Batch (Start.bat)：

說明：
使用Node.JS與jQuery進行數據同步變更。
Posted by QQBoxy
Tag - , ,

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