移動端NODEJS ,How to Run Node.js with Express on Mobile Devices
We released aJXcoreplugin forApache Cordovarecently and in this article I will show how to run a Nodeexpressapplication with Cordova.
At the time of writing thejxcore-cordovaproject on github has two samples prepared for running the express module.
The project contains aninstall_and_runscript (documentedhere), which simplifies creating a Cordova application and running the samples. I』m going to use the script in this article.
Express on AndroidThe script assumes that Apache Cordova and the Android SDK is installed on your system. If they are not, please refer to individual documentation on how to do this.
Plug an android device into a USB socket (with USB Debugging enabled), unless you want to run the application on the Android Emulator.
Download thescriptand save it into an empty folder. Run it with a sample folder name as an argument, for example 「express sample」:
$ ./install_and_run.sh "express sample"
Shortly, you should see the following screen:
The application displays the IP addresses that the device is using and which port the express server is running on (3000 in our case). Take that URL and use it in your browser, i.e.:
We can see that the browser was able to connect to our Express server running on the device and receive the proper answer for the request.http://10.0.2.15:3000
A note for emulator users: As you might have noticed on the screen above, I did not use the IP and port mentioned before, buthttp://localhost:8080instead. This is because I was running the sample on an AVD (Android Virtual Device), and the IP is not reachable outside the emulator』s internal router (seeEmulator Networkingfor more details). Thus my solution was to establish a simple port redirection:
telnet localhost 5558redir add tcp:8080:3000
Which redirects all http requests from mylocalhost:8080into the emulator』s3000port. The5558number is the port on which my AVD was running (visible at AVD』s title bar).
Express on iOSWe can run the same sample on iOS devices. Theinstall_and_run.shscript can handle it, but the iOS support is currently commented out, run those commands:
This time accessing the Express server from the browser is more straightforward, for example,http://192.168.1.11:3000.# or run on ios$ cordova platforms add ios$ cordova run ios
Looking at the code
Looking at theapp.jsfile located in thewww/jxcorefolder of theexpress sample, the Express server is implemented in the same way as a regular Node.js application:
var express = require("express");var app = express();app.get("/", function (req, res) { res.send("Hello World! (" + Date.now() + ")");});var server = app.listen(3000, function () { clog("Express server is started. (port: 3000)");});
Express server running on another thread
Let』s look at the other example:
$ ./install_and_run.sh "express performance sample"
This example performs similarly, but there is one major difference. It runs the express server in a separate thread unblocking the main thread. This is easy with JXcore as it offers multitasking, before it even arrived on mobile platforms.
This is the code:
jxcore.tasks.addTask(function() { var clog = require("./utilities").log; var express = require("express"); var app = express(); app.get("/", function (req, res) { res.send("Hello World! (" + Date.now() + ")"); }); var server = app.listen(3000, function () { clog("Express server is started. (port: 3000)"); });});
Note: The code is similar to the previous example. But is wrapped in ajxcore.tasks.addTask()invocation which handles the logic related to running the block in a separate instance.
The Express web framework is one of the most popular and important modules in the Node.JS ecosystem. With JXcore it is possible to make it run on mobile devices and it brings a range of features (including multithreading/multitasking and packaging) that can be used in the mobile world.
Tags:Cordova,Phonegap推薦閱讀：
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