Java tutorial
/* tweaked version of ElementalHttpServer from * https://hc.apache.org/httpcomponents-core-ga/examples.html * * ==================================================================== * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package it.danja.newsmonitor.utils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.File; import java.io.IOException; import java.io.InterruptedIOException; import java.net.ServerSocket; import java.net.Socket; import java.net.URL; import java.net.URLDecoder; import java.nio.charset.Charset; import java.security.KeyManagementException; import java.security.KeyStore; import java.security.KeyStoreException; import java.security.NoSuchAlgorithmException; import java.security.UnrecoverableKeyException; import java.security.cert.CertificateException; import java.util.Locale; import org.apache.http.ConnectionClosedException; import org.apache.http.HttpConnectionFactory; import org.apache.http.HttpEntity; import org.apache.http.HttpEntityEnclosingRequest; import org.apache.http.HttpException; import org.apache.http.HttpRequest; import org.apache.http.HttpResponse; import org.apache.http.HttpServerConnection; import org.apache.http.HttpStatus; import org.apache.http.MethodNotSupportedException; import org.apache.http.entity.ContentType; import org.apache.http.entity.FileEntity; import org.apache.http.entity.StringEntity; import org.apache.http.impl.DefaultBHttpServerConnection; import org.apache.http.impl.DefaultBHttpServerConnectionFactory; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.HttpContext; import org.apache.http.protocol.HttpProcessor; import org.apache.http.protocol.HttpProcessorBuilder; import org.apache.http.protocol.HttpRequestHandler; import org.apache.http.protocol.HttpService; import org.apache.http.protocol.ResponseConnControl; import org.apache.http.protocol.ResponseContent; import org.apache.http.protocol.ResponseDate; import org.apache.http.protocol.ResponseServer; import org.apache.http.protocol.UriHttpRequestHandlerMapper; import org.apache.http.util.EntityUtils; import javax.net.ssl.KeyManager; import javax.net.ssl.KeyManagerFactory; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLServerSocketFactory; /** * Basic, yet fully functional and spec compliant, HTTP/1.1 file server. */ public class HttpServer { private static Logger log = LoggerFactory.getLogger(HttpServer.class); private String docRoot; private int port; private HttpService httpService; private SSLServerSocketFactory sf = null; private Thread serverThread = null; public static Socket socket; public static HttpServerConnection conn; public static WorkerThread workerThread; public static boolean running; public static void main(String[] args) throws Exception { // if (args.length < 1) { // System.err.println("Please specify document root directory"); // System.exit(1); // } // // Document root directory // String docRoot = args[0]; // int port = 8080; // if (args.length >= 2) { // port = Integer.parseInt(args[1]); // } HttpServer server = new HttpServer("src/main/resources/META-INF/resources/static/newsmonitor", 8088); // "www" "../NewsMonitor" server.init(); server.start(); } public HttpServer(String docRoot, int port) { this.docRoot = docRoot; this.port = port; } public void init() { // Set up the HTTP protocol processor HttpProcessor httpproc = HttpProcessorBuilder.create().add(new ResponseDate()) .add(new ResponseServer("Test/1.1")).add(new ResponseContent()).add(new ResponseConnControl()) .build(); // Set up request handlers UriHttpRequestHandlerMapper reqistry = new UriHttpRequestHandlerMapper(); reqistry.register("*", new HttpFileHandler(docRoot)); // Set up the HTTP service httpService = new HttpService(httpproc, reqistry); if (port == 8443) { // Initialize SSL context ClassLoader cl = HttpServer.class.getClassLoader(); URL url = cl.getResource("my.keystore"); if (url == null) { log.info("HttpServer : Keystore not found"); System.exit(1); } KeyStore keystore = null; try { keystore = KeyStore.getInstance("jks"); } catch (KeyStoreException e) { log.error(e.getMessage()); } try { keystore.load(url.openStream(), "secret".toCharArray()); } catch (NoSuchAlgorithmException e) { log.error(e.getMessage()); } catch (CertificateException e) { log.error(e.getMessage()); } catch (IOException e) { log.error(e.getMessage()); } KeyManagerFactory kmfactory = null; try { kmfactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm()); } catch (NoSuchAlgorithmException e) { log.error(e.getMessage()); } try { kmfactory.init(keystore, "secret".toCharArray()); } catch (UnrecoverableKeyException e) { log.error(e.getMessage()); } catch (KeyStoreException e) { log.error(e.getMessage()); } catch (NoSuchAlgorithmException e) { log.error(e.getMessage()); } KeyManager[] keymanagers = kmfactory.getKeyManagers(); SSLContext sslcontext = null; try { sslcontext = SSLContext.getInstance("TLS"); } catch (NoSuchAlgorithmException e) { log.error(e.getMessage()); } try { sslcontext.init(keymanagers, null, null); } catch (KeyManagementException e) { log.error(e.getMessage()); } this.sf = sslcontext.getServerSocketFactory(); } } public void start() { if (this.serverThread == null) { running = true; try { this.serverThread = new RequestListenerThread(this.port, this.httpService, this.sf); } catch (IOException e) { // log.error(e.getMessage()); return; } this.serverThread.setDaemon(false); this.serverThread.start(); } } public void stop() { // TODO can't get this to work... yucky workaround in start() //log.info("STOP server"); running = false; // try { // Thread.sleep(1000); // } catch (InterruptedException e) { // log.error(e.getMessage()); // } // try { // socket.close(); // } catch (IOException e1) { // e1.printStackTrace(); // } // try { // conn.close(); // } catch (IOException e1) { // e1.printStackTrace(); // } } static class HttpFileHandler implements HttpRequestHandler { private final String docRoot; public HttpFileHandler(final String docRoot) { super(); this.docRoot = docRoot; } public void handle(final HttpRequest request, final HttpResponse response, final HttpContext context) throws HttpException, IOException { String method = request.getRequestLine().getMethod().toUpperCase(Locale.ENGLISH); if (!method.equals("GET") && !method.equals("HEAD") && !method.equals("POST")) { throw new MethodNotSupportedException(method + " method not supported"); } String target = request.getRequestLine().getUri(); if (request instanceof HttpEntityEnclosingRequest) { HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity(); byte[] entityContent = EntityUtils.toByteArray(entity); log.info("HttpServer : Incoming entity content (bytes): " + entityContent.length); } final File file = new File(this.docRoot, URLDecoder.decode(target, "UTF-8")); if (!file.exists()) { response.setStatusCode(HttpStatus.SC_NOT_FOUND); StringEntity entity = new StringEntity( "<html><body><h1>File" + file.getPath() + " not found</h1></body></html>", ContentType.create("text/html", "UTF-8")); response.setEntity(entity); log.info("HttpServer : File " + file.getPath() + " not found"); } else if (!file.canRead() || file.isDirectory()) { response.setStatusCode(HttpStatus.SC_FORBIDDEN); StringEntity entity = new StringEntity("<html><body><h1>Access denied</h1></body></html>", ContentType.create("text/html", "UTF-8")); response.setEntity(entity); log.info("HttpServer : Cannot read file " + file.getPath()); } else { response.setStatusCode(HttpStatus.SC_OK); String mime = "text/html"; if (target.endsWith(".css")) { mime = "text/css"; } if (target.endsWith(".js")) { mime = "application/javascript"; } if (target.endsWith(".png")) { mime = "image/png"; } if (target.endsWith(".gif")) { mime = "image/gif"; } // log.info("CONTENT_ENCODING"); FileEntity body = new FileEntity(file, ContentType.create(mime, (Charset) null)); // simulate latency // try { // Thread.sleep(2000); // } catch (InterruptedException e) { // log.error(e.getMessage()); // } response.setEntity(body); if (target.endsWith(".html")) { response.addHeader("Content-Type", "text/html; charset=UTF-8"); } log.info("HttpServer : Serving file " + file.getPath()); } } } static class RequestListenerThread extends Thread { private final HttpConnectionFactory<DefaultBHttpServerConnection> connFactory; private final ServerSocket serversocket; private final HttpService httpService; public RequestListenerThread(final int port, final HttpService httpService, final SSLServerSocketFactory sf) throws IOException { this.connFactory = DefaultBHttpServerConnectionFactory.INSTANCE; this.serversocket = sf != null ? sf.createServerSocket(port) : new ServerSocket(port); this.httpService = httpService; } @Override public void run() { log.info("HttpServer : Listening on port " + this.serversocket.getLocalPort()); while (running) { try { // Set up HTTP connection socket = this.serversocket.accept(); log.info("HttpServer : Incoming connection from " + socket.getInetAddress()); conn = this.connFactory.createConnection(socket); // Start worker thread workerThread = new WorkerThread(this.httpService, conn); workerThread.setDaemon(true); workerThread.start(); } catch (InterruptedIOException ex) { break; } catch (IOException e) { System.err.println("I/O error initialising connection thread: " + e.getMessage()); break; } } } } static class WorkerThread extends Thread { private final HttpService httpservice; private final HttpServerConnection conn; public WorkerThread(final HttpService httpservice, final HttpServerConnection conn) { super(); this.httpservice = httpservice; this.conn = conn; } @Override public void run() { HttpServer.log.info("HttpServer : New connection thread"); HttpContext context = new BasicHttpContext(null); try { while (running && !Thread.interrupted() && this.conn.isOpen()) { this.httpservice.handleRequest(this.conn, context); } } catch (ConnectionClosedException ex) { System.err.println("HttpServer : Client closed connection"); } catch (IOException ex) { System.err.println("HttpServer : I/O error: " + ex.getMessage()); } catch (HttpException ex) { System.err.println("HttpServer : Unrecoverable HTTP protocol violation: " + ex.getMessage()); } finally { try { this.conn.shutdown(); } catch (IOException ignore) { } } } } }