Simple Http Server Express.js Style

This is a simple implementation of a Http Server in Java. Currently it only serves static files like HTML, Css, Javascript and Images and enables some simple routing mechanisms.

Execution

The server.jar in the dist folder can be used to execute the server. It serves all files from the public_html.

Routing

The server is written similar to express.js. The only things needed to instantiate the server is a config and a base server.

#!java

Config config = ConfigFactory.parseFile(...);
Server server = new MultithreadedServer(config.getInt("server.port"), config);

After that we are good to go and can start attaching middlewares and routes to the server. Like in express.js the server itself is also a router.

#!java

// express.js style routing, pretty neat right?
server
// this middleware attaches the Server: NDS Http Server header to each request, just for fun
.use((request, response, next) -> {
	response.addHeader(new ServerHeader("NDS Http Server"));
	next.apply();
})

// serve static files
.use(new FileMiddleware(config.getString("server.static")))

// no file found? let's try these routes then
.use("/", (request, response) -> {
        // listens to /
	// let's return only hello world
	response.setStatusCode(StatusCode.OK);
	response.addHeader(new ContentTypeHeader("text/html"));
	response.setContent("Hello World");
});

/*
 * ok that is neat, but what about nested routers?
 * oh thats possible too? cool! let's try that.
 */

Router router = new Router();

router.use("/test", (request, response) -> {
	response.setStatusCode(StatusCode.OK);
	response.addHeader(new ContentTypeHeader("text/html"));
	response.setContent("I am the nested route /test");
});

// let's add the sub router
// makes the /test route available under /workspace/text
server.use("/workspace", router);

// no route matched till now apparently, so let's return 404
server.use((request, response, next) -> {
	if(response.getStatusCode() == null) {
		response.setStatusCode(StatusCode.NOT_FOUND);
	}
});

Ok after setting up the server all that is left, is to start it

#!java

server.start();

The Configuration File looks like this

#!json

"server": {
	"port": 9090,
	"static": "./public_html"
},

"mime": {
	"extension": {
		"js": "application/javascript",
		"css": "text/css",
		"html": "text/html",
		"jpg": "image/jpeg",
		"jpeg": "image/jpeg",
		"png": "image/png",
		"ico": "image/x-icon"
	}
}