Java NanoHTTP WebServer

WebServer.java

package server;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import fi.iki.elonen.NanoHTTPD;

public class WebServer extends NanoHTTPD {

    private static final int PORT = 8080;
    private static final String DEFAULT_FILE = "index.html";
    private String staticFolder;

    public WebServer(String staticFolder) throws IOException {
        super(PORT);
        this.staticFolder = staticFolder;
        start(NanoHTTPD.SOCKET_READ_TIMEOUT, false);
    }

    @Override
    public Response serve(IHTTPSession session) {
        String uri = session.getUri();
        String filePath;

        if (uri.equals("/")) {
            filePath = staticFolder + "/" + DEFAULT_FILE;
        } else {
            filePath = staticFolder + uri;
        }

        try {
            File file = new File(filePath);

            if (file.exists() && file.isFile()) {
                InputStream inputStream = new FileInputStream(file);
                Response response = newFixedLengthResponse(Response.Status.OK, getMimeType(filePath), inputStream, file.length());

                /*
                response.addHeader("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0");
                response.addHeader("Pragma", "no-cache");
                response.addHeader("Expires", "0");
                */

                return response;
            } else {
                return newFixedLengthResponse(Response.Status.NOT_FOUND, NanoHTTPD.MIME_PLAINTEXT, "Arquivo não encontrado");
            }
        } catch (IOException e) {
            return newFixedLengthResponse(Response.Status.INTERNAL_ERROR, NanoHTTPD.MIME_PLAINTEXT, "Erro ao processar a requisição");
        }
    }

    private String getMimeType(String filePath) {
        String mimeType = NanoHTTPD.getMimeTypeForFile(filePath);

        if (mimeType == null) {
            mimeType = NanoHTTPD.MIME_PLAINTEXT;
        }

        return mimeType;
    }
}

/*
Usage:
WebServer server = new WebServer("/data/data/PACKAGE/www");
*/