Http Server in Minitab

Here’s the translation of the HTTP Server example from Go to Java, formatted in Markdown suitable for Hugo:

Our HTTP server example demonstrates how to create a basic server using Java’s built-in com.sun.net.httpserver package.

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;

public class HttpServerExample {

    public static void main(String[] args) throws IOException {
        HttpServer server = HttpServer.create(new InetSocketAddress(8090), 0);
        server.createContext("/hello", new HelloHandler());
        server.createContext("/headers", new HeadersHandler());
        server.setExecutor(null); // creates a default executor
        server.start();
    }

    static class HelloHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange t) throws IOException {
            String response = "hello\n";
            t.sendResponseHeaders(200, response.length());
            OutputStream os = t.getResponseBody();
            os.write(response.getBytes());
            os.close();
        }
    }

    static class HeadersHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange t) throws IOException {
            StringBuilder response = new StringBuilder();
            t.getRequestHeaders().forEach((key, values) -> {
                values.forEach(value -> response.append(key).append(": ").append(value).append("\n"));
            });
            t.sendResponseHeaders(200, response.length());
            OutputStream os = t.getResponseBody();
            os.write(response.toString().getBytes());
            os.close();
        }
    }
}

In Java, we use the HttpServer class from the com.sun.net.httpserver package to create a basic HTTP server. This is similar to using the net/http package in other languages.

A fundamental concept in Java HTTP servers is the HttpHandler interface. This is analogous to handlers in other web frameworks. We implement this interface to define how our server should respond to different requests.

We define two handler classes: HelloHandler and HeadersHandler. Each implements the handle method of the HttpHandler interface.

The HelloHandler simply responds with “hello\n” to any request.

The HeadersHandler is more sophisticated. It reads all the HTTP request headers and echoes them into the response body.

In the main method, we create the server, set up the routes (contexts in Java terminology), and start the server:

We create the server to listen on port 8090.
We register our handlers on server routes using the createContext method.
Finally, we call the start method to begin accepting incoming connections.

To run the server:

$ javac HttpServerExample.java
$ java HttpServerExample &

You can then access the server:

$ curl localhost:8090/hello
hello

This example demonstrates how to set up a basic HTTP server in Java, define custom handlers for different routes, and handle incoming requests.

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Http Server in Minitab