HTTP Server

HTTPServer.java

package preiss;

import com.sun.net.httpserver.Headers;
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.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

/**
 * @author preissl
 */
public class HTTPServer implements HttpHandler {

	private String context = "/fbmsg";
	int port = 4245;
	String strResponse = "";
	boolean testOK = true; // Set to true if want to test positive response.

	public static void main(String[] args) {
		new HTTPServer().run();
	}

	public void run() {
		HttpServer server = null;
		try {
			server = HttpServer.create(new InetSocketAddress(port), 10);
			server.setExecutor(Executors.newFixedThreadPool(10));
			server.start();
			server.createContext(context, this);

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}

	}

	public void handle(HttpExchange httpExch) throws IOException {

		StringBuilder sb = new StringBuilder();
		try (InputStream inputStream = httpExch.getRequestBody()) {
			sb = new StringBuilder();
			int i;
			while ((i = inputStream.read()) != -1) {
				sb.append((char) i);
			}
		}

		if (testOK) {
			replyOK(httpExch);
		} else {
			replyError(httpExch);
		}
	}

	/**
	 * 
	 * @param httpExch
	 * 
	 * Sends a 200 OK back
	 */
	private void replyOK(HttpExchange httpExch) {

		try {
			Headers responseHeaders = httpExch.getResponseHeaders();
			responseHeaders.add("Content-Type", ("application/json"));
			strResponse = getResponse();
			if (strResponse != null) {
				httpExch.sendResponseHeaders(200, strResponse.length());

				try (OutputStream os = httpExch.getResponseBody()) {
					os.write(strResponse.getBytes());
				}
			} else {
				httpExch.sendResponseHeaders(200, -1);
			}

		} catch (IOException e1) {
			System.out.println(e1.getMessage());
		}
	}

	private String getResponse() {
		return "Any String You Want To";
	}

	/**
	 * 
	 * @param httpExch
	 *            There are any number of ways to create an error in the response. This method sends back a 404 and also mismatched the content length
	 *            and the content, to create an unexpected EOF error.
	 * 
	 */
	private void replyError(HttpExchange httpExch) {
		String replyString = "Error";
		try {
			Headers responseHeaders = httpExch.getResponseHeaders();
			responseHeaders.add("Content-Type", ("application/json"));
			httpExch.sendResponseHeaders(404, 0);

			try (OutputStream os = httpExch.getResponseBody()) {
				os.write(replyString.getBytes());
			}

		} catch (IOException e1) {
			System.out.println(e1.getMessage());
		}
	}

}

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

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

public class SimpleHttpServer {

public static void main(String[] args) throws Exception {
    HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
    server.createContext("/", new MyHandler());
    server.setExecutor(null);
    server.start();
    System.out.println("Server started on port 8000");
}

static class MyHandler implements HttpHandler {
    @Override
    public void handle(HttpExchange exchange) throws IOException {
        String response = "Hello, this is a simple Java HTTP server!";
        exchange.sendResponseHeaders(200, response.getBytes().length);
        OutputStream os = exchange.getResponseBody();
        os.write(response.getBytes());
        os.close();
    }
}

}