Http Server in Squirrel

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();
            for (String name : t.getRequestHeaders().keySet()) {
                for (String value : t.getRequestHeaders().get(name)) {
                    response.append(name).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 simple HTTP server. This is analogous to the net/http package in Go.

The concept of handlers in Java is similar to Go. We implement the HttpHandler interface to create our custom handlers. Each handler is responsible for processing requests and sending responses.

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

We create an HttpServer instance bound to port 8090.
We create contexts for different routes ("/hello" and “/headers”) and associate them with their respective handlers.
We set the executor to null, which creates a default executor.
Finally, we start the server.

The HelloHandler simply sends “hello\n” as a response, while the HeadersHandler reads all the HTTP request headers and echoes them in the response body.

To run the server:

$ javac HttpServerExample.java
$ java HttpServerExample &

To access the /hello route:

$ curl localhost:8090/hello
hello

This example demonstrates how to create a basic HTTP server in Java, set up routes, and handle HTTP requests. While the implementation details differ from Go, the core concepts of creating routes and handling requests remain similar.

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