Http Server in Miranda

Here’s the translated code and explanation in Markdown format suitable for Hugo:

Our first HTTP server program using Java. Here’s the full source code:

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 SimpleHttpServer {

    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);
        server.start();
    }

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

    static class HeadersHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            StringBuilder response = new StringBuilder();
            for (String key : exchange.getRequestHeaders().keySet()) {
                response.append(key).append(": ")
                        .append(exchange.getRequestHeaders().getFirst(key))
                        .append("\n");
            }
            exchange.sendResponseHeaders(200, response.length());
            try (OutputStream os = exchange.getResponseBody()) {
                os.write(response.toString().getBytes());
            }
        }
    }
}

Writing a basic HTTP server in Java involves using the com.sun.net.httpserver package, which provides a simple HTTP server implementation.

A fundamental concept in Java HTTP servers is handlers. A handler is an object implementing the HttpHandler interface. We define two handler classes: HelloHandler and HeadersHandler.

The HelloHandler class serves a simple “hello” response:

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

The HeadersHandler class does something more sophisticated by reading all the HTTP request headers and echoing them into the response body:

static class HeadersHandler implements HttpHandler {
    @Override
    public void handle(HttpExchange exchange) throws IOException {
        StringBuilder response = new StringBuilder();
        for (String key : exchange.getRequestHeaders().keySet()) {
            response.append(key).append(": ")
                    .append(exchange.getRequestHeaders().getFirst(key))
                    .append("\n");
        }
        exchange.sendResponseHeaders(200, response.length());
        try (OutputStream os = exchange.getResponseBody()) {
            os.write(response.toString().getBytes());
        }
    }
}

In the main method, we create an HttpServer instance, register our handlers on server routes using createContext, and start the server:

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);
    server.start();
}

To run the server:

$ javac SimpleHttpServer.java
$ java SimpleHttpServer &

Access the /hello route:

$ curl localhost:8090/hello
hello

This example demonstrates how to create a basic HTTP server in Java, defining custom handlers for different routes, and processing HTTP requests and responses.

Exit in Miranda

Execing Processes in Miranda

Learn X By Example

Title here

Http Server in Miranda