Http Server in Logo

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

Our first 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 HTTPServer {

    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 key : t.getRequestHeaders().keySet()) {
                response.append(key).append(": ")
                        .append(String.join(", ", t.getRequestHeaders().get(key)))
                        .append("\n");
            }
            t.sendResponseHeaders(200, response.length());
            OutputStream os = t.getResponseBody();
            os.write(response.toString().getBytes());
            os.close();
        }
    }
}

In Java, we use the HttpHandler interface to define our request handlers. This is similar to the concept of handlers in the net/http package.

The HelloHandler and HeadersHandler classes implement the HttpHandler interface, providing the logic for handling requests to the /hello and /headers endpoints respectively.

In the main method, we create an HttpServer instance, set up the context paths with their corresponding handlers, and start the server.

To run the server:

$ javac HTTPServer.java
$ java HTTPServer &

Now you can access the /hello route:

$ curl localhost:8090/hello
hello

This example demonstrates how to set up a basic HTTP server in Java, register handlers for different routes, and process incoming requests. The structure is similar to the original example, but uses Java-specific classes and interfaces to achieve the same functionality.

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Http Server in Logo