Hello World
Let's begin by implementing a tiny application that displays a welcome message.
Create the Directories
First, let us create a directory named helloworld
. All files for this application reside in this directory. It is also known as the project directory.
Inside the helloworld
directory, create a directory named web
. It will be the root directory for serving web pages. All Dart files and web resources reside in this directory.
Inside the web
directory, create a directory named webapp
. All your server-side Dart code reside in this directory. In additions, any files under webapp
directory cannot be accessed directly from the clients.
The application, on the other hand, can access, forward and include any files under
web
.
Here is the directory structure to create in this sample.
hello-world/
pubspec.yaml
web/
index.html
webapp/
main.dart
Notice that the
web
directory is required since pub installed packages only underweb
,test
andexample
directories.If you prefer to structure it differently, please refer to Directory Structure.
Create pubspec.yaml
Inside the helloworld
directory, create a pubspec.yaml
with the following contents:
name: helloworld
version: 1.0.0
description: Hello World Sample Application
dependencies:
stream: any
Then, change to the helloworld
directory, and run pub install, either on the command line or through the Dart Editor menu: Tools > Pub Install
.
Create the Main Program
Inside the webapp
directory, we have to prepare a main program that starts the Stream server. Let us name it main.dart
and give the following contents:
import "package:stream/stream.dart";
void main() {
new StreamServer().start();
}
Create the Welcome Message
To display the welcome message, create a HTML file named index.html
, put it right under the web
directory, and give it the following contents.
<!DOCTYPE html>
<html>
<head>
<title>Hello World!</title>
</head>
<body>
<h1>Welcome to Stream!</h1>
</body>
</html>
Start the Application
You can start the application by invoking the main program as follows:
dart web/webapp/main.dart
The web server is now running, listening for requests on port 8080. You can test the application by visiting the following URL in your web browser: