Java 1.6 web server

import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.File;
import java.net.InetSocketAddress;
import java.net.FileNameMap;
import java.net.URLConnection;
import java.util.concurrent.Executors;

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

public class FileHandler implements HttpHandler {
	FileNameMap fileNameMap = URLConnection.getFileNameMap();
	
	public static void main(String[] args) throws IOException {
		int serverPort = 8080;
		InetSocketAddress addr = new InetSocketAddress(serverPort);
		HttpServer server = HttpServer.create(addr, 0);

		server.createContext("/", new FileHandler());
		server.setExecutor(Executors.newCachedThreadPool());
		server.start();
		System.out.println("Server is listening on port " + serverPort);
	}

	public void handle(HttpExchange exchange) throws IOException {
		String requestMethod = exchange.getRequestMethod();
		String targetPath = exchange.getRequestURI().getPath();
		if (requestMethod.equalsIgnoreCase("GET")) {
			
			// Here it's a good place to include custom path handling,
			// like calls to Java functions
			
			// Handle paths trying to open index.html
			// Instead of this, we could show a list of the files in the folder
			if (targetPath.endsWith("/")) {
				targetPath += "index.html";
			}
			
			// Check if file exists
			File fileFolder = new File(".", "htdocs");
			File targetFile = new File(fileFolder, targetPath.replace('/', File.separatorChar));
			
			if (targetFile.exists() && targetFile.isFile()) {
				// If it exists and it's a file, serve it
				int bufLen = 10000*1024;
				byte[] buf = new byte[bufLen];
				int len    = 0;
				Headers responseHeaders = exchange.getResponseHeaders();
				
				// Get mime type from the ones defined in [jre_home]/lib/content-types.properties 
				String mimeType = fileNameMap.getContentTypeFor(targetFile.toURI().toURL().toString());
				
				if (mimeType == null) {
					mimeType = "application/octet-stream";
				}
				
				responseHeaders.set("Content-Type", mimeType);
				
				exchange.sendResponseHeaders(200, targetFile.length());
				
				FileInputStream fileIn = new FileInputStream(targetFile);
				OutputStream out = exchange.getResponseBody();
				
				while ((len = fileIn.read(buf,0,bufLen)) != -1) {
					out.write(buf, 0, len);
				}
				
				out.close();
				fileIn.close();
			} else {
				// If it doesn't exist, send error
				String message = "404 Not Found " + exchange.getRequestURI();
				exchange.sendResponseHeaders(404, 0);
				OutputStream out = exchange.getResponseBody();
	            out.write(message.getBytes());
	            out.close();
			}
		}
	}
}