J2EE Maven Eclipse Hello World Tutorial Part Two

Hello World Beginner Tutorial using J2EE and Maven

This is part two of J2EE application with maven continued from Part One.

If you haven’t accomplished J2EE with Maven tutorial, please first complete it by going here

Maven relies highly on the pom.xml file that we would put on the project root folder. Lets do that.

In this part of J2EE tutorial and Maven tutorial, we will proceed from creating a pom.xml file which is the heart of maven.

3 Create the pom and compile the project using maven.

3.a put the following pom file in the MavenEclipseJ2EE directory.
Continue reading J2EE Maven Eclipse Hello World Tutorial Part Two

a hello world tutorial using node js with http web server

This is a continuation of the tutorial started on node js angular and mongo db shown on
node js console tutorial

In order to have simple website that is displaying hello world, we need to have a web server. In the previous example there was no need to have a web server since the message was shown from command line.

Node provides its own web server that we can serve http request and responses.

I will cover on the later tutorial how those would be used, for now. All we need is to be able to go to http://localhost:8080 and see the the output of hello world

Serving the page through web server

If you have followed the above tutorial listed on the link, start from number 3.

1. Create a folder in your computer and name it as node-tutorial

2. In the node-tutorial folder create server.js file

3. On server.js add the following code in it and save it.

 var http = require("http");
 var server = http.createServer(function (request, response) {
 response.writeHead(200, {"Content-Type":"text/plain"});
 response.end("Hello World");
 console.log("Something awesome to happen at http://localhost:8080");

4. go to your browser and type http://localhost:8080 and you will see Hello World being printed on your browser.

Congratulations! you have successfully created a website that prints Hello World.

What is going on

The above snippet creates a very basic yet full fledged web server. At the heart of any web server are request and response

request is what the browser behalf of the user is sending to the server and it waits for the server to give it back something to show to the user. The request is the one that contains the form elements usually

response is what the server would be responding based on the request forwarded to the server. It contains usually the type of the response data, like text or json or image through its header and the actual data to be returned.

require("http"); This part tells node to import the http package for usage.

With the hello world example above, the request contains no input fields but it is full request in that it is requesting for the response of hello world.

Don’t worry if you don’t get much of the request response stuff, as it would be clear on the upcoming parts of this tutorial.

Since simply printing Hello Worlds is not that much fun. We will see how to do some other exciting stuffs on the upcoming parts of tutorials.

Next: Accept input from the browser/user and process the input

node js mongo db and angular js tutorial for beginners from scratch

node js beginner guide with mongo and angular

node js step by step tutorial showing you how to create a full fledged node js angular js and mongo db for beginners who have never played with these technologies or played partially independently but not all those technologies together.

I assume installing nodejs to your computer can be found easily and I will not go through that.

Starting with a simple Hello world display with webserver

Node js is a fully functional webserver and processor that is created off of Googles V8 engine. It is very light weight and the syntax is javascript syntax.

Unlike other languages where you have to setup and configure a different independent webserver, node js, comes with a total self contained web server serving at ports that you can assign. Which makes it a full one stop web application.

For comparison, when working on php might require you to setup a different webserver like Apache or IIS.

In this part, I will show a very simple old school hello world example to be done in node js.

In the upcoming tutorials, you will see how to change those step by step.

Hello world in node js

1. Create a folder in your computer and name it as node-tutorial

2. in the node-tutorial folder create hello.js file

3 on hello.js add the following code in it.

console.log("Hello World");

Then save the above file and run the file as

node hello.js

This will print Hello World in the CONSOLE.

What did happen

The above code is running from the node js as a command line code. There is no any web server, that making it available through browsers per se, this time, it will just print that on right on the terminal you are running it.

You might know console.log() from your javascript coding and it is doing the same task here in node as well.

Next: Run Hello World using http through browser