Java tutorial
/* * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0.1/httpcore-nio/src/examples/org/apache/http/examples/nio/NHttpServer.java $ * $Revision: 744516 $ * $Date: 2009-02-14 17:38:14 +0100 (Sat, 14 Feb 2009) $ * * ==================================================================== * 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/>. * */ import java.io.File; import java.io.IOException; import java.io.InterruptedIOException; import java.net.InetSocketAddress; import java.net.URLDecoder; import java.util.Locale; 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.HttpStatus; import org.apache.http.MethodNotSupportedException; import org.apache.http.impl.DefaultConnectionReuseStrategy; import org.apache.http.impl.DefaultHttpResponseFactory; import org.apache.http.impl.nio.DefaultServerIOEventDispatch; import org.apache.http.impl.nio.reactor.DefaultListeningIOReactor; import org.apache.http.nio.NHttpConnection; import org.apache.http.nio.entity.NFileEntity; import org.apache.http.nio.entity.NStringEntity; import org.apache.http.nio.protocol.BufferingHttpServiceHandler; import org.apache.http.nio.protocol.EventListener; import org.apache.http.nio.reactor.IOEventDispatch; import org.apache.http.nio.reactor.ListeningIOReactor; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.CoreConnectionPNames; import org.apache.http.params.CoreProtocolPNames; import org.apache.http.params.HttpParams; import org.apache.http.protocol.BasicHttpProcessor; import org.apache.http.protocol.HttpContext; import org.apache.http.protocol.HttpRequestHandler; import org.apache.http.protocol.HttpRequestHandlerRegistry; 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.util.EntityUtils; /** * Basic, yet fully functional and spec compliant, HTTP/1.1 server based on the non-blocking * I/O model. * <p> * Please note the purpose of this application is demonstrate the usage of HttpCore APIs. * It is NOT intended to demonstrate the most efficient way of building an HTTP server. * * * @version $Revision: 744516 $ */ public class NioHttpServer { IOEventDispatch io_event_dispatch; ListeningIOReactor io_reactor; int port; public NioHttpServer(int port, // TCP port for the server. HttpRequestHandler request_responder, // Scheme level responder for HTTP requests from clients. EventListener connection_listener) throws Exception { HttpParams params = new BasicHttpParams(); params.setIntParameter(CoreConnectionPNames.SO_TIMEOUT, 5000) .setIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 8 * 1024) .setBooleanParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, false) .setBooleanParameter(CoreConnectionPNames.TCP_NODELAY, true) .setParameter(CoreProtocolPNames.ORIGIN_SERVER, "HttpComponents/1.1"); BasicHttpProcessor httpproc = new BasicHttpProcessor(); httpproc.addInterceptor(new ResponseDate()); httpproc.addInterceptor(new ResponseServer()); httpproc.addInterceptor(new ResponseContent()); httpproc.addInterceptor(new ResponseConnControl()); BufferingHttpServiceHandler service_handler = new BufferingHttpServiceHandler(httpproc, new DefaultHttpResponseFactory(), new DefaultConnectionReuseStrategy(), params); // Set up request handlers HttpRequestHandlerRegistry reqistry = new HttpRequestHandlerRegistry(); reqistry.register("*", request_responder); service_handler.setHandlerResolver(reqistry); service_handler.setEventListener(connection_listener); // Provide a connection listener. // Use two worker threads for the IO reactor. io_reactor = new DefaultListeningIOReactor(2, params); io_event_dispatch = new DefaultServerIOEventDispatch(handler, params); this.port = port; // Set the listening TCP port. } public void go() throws Exception { // Propagate exceptions to Scheme level. io_reactor.listen(new InetSocketAddress(port)); io_reactor.execute(io_event_dispatch); } 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"); } if (request instanceof HttpEntityEnclosingRequest) { HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity(); byte[] entityContent = EntityUtils.toByteArray(entity); System.out.println("Incoming entity content (bytes): " + entityContent.length); } String target = request.getRequestLine().getUri(); final File file = new File(this.docRoot, URLDecoder.decode(target, "UTF-8")); if (!file.exists()) { response.setStatusCode(HttpStatus.SC_NOT_FOUND); NStringEntity entity = new NStringEntity( "<html><body><h1>File" + file.getPath() + " not found</h1></body></html>", "UTF-8"); entity.setContentType("text/html; charset=UTF-8"); response.setEntity(entity); System.out.println("File " + file.getPath() + " not found"); } else if (!file.canRead() || file.isDirectory()) { response.setStatusCode(HttpStatus.SC_FORBIDDEN); NStringEntity entity = new NStringEntity("<html><body><h1>Access denied</h1></body></html>", "UTF-8"); entity.setContentType("text/html; charset=UTF-8"); response.setEntity(entity); System.out.println("Cannot read file " + file.getPath()); } else { response.setStatusCode(HttpStatus.SC_OK); NFileEntity body = new NFileEntity(file, "text/html"); response.setEntity(body); System.out.println("Serving file " + file.getPath()); } } } static class EventLogger implements EventListener { public void connectionOpen(final NHttpConnection conn) { System.out.println("Connection open: " + conn); } public void connectionTimeout(final NHttpConnection conn) { System.out.println("Connection timed out: " + conn); } public void connectionClosed(final NHttpConnection conn) { System.out.println("Connection closed: " + conn); } public void fatalIOException(final IOException ex, final NHttpConnection conn) { System.err.println("I/O error: " + ex.getMessage()); } public void fatalProtocolException(final HttpException ex, final NHttpConnection conn) { System.err.println("HTTP error: " + ex.getMessage()); } } }