Java tutorial
/* * Copyright 2014 Fizzed, Inc. * * Licensed 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. */ package com.fizzed.stork.sample; import io.netty.bootstrap.ServerBootstrap; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.ChannelPipeline; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpHeaders; import static io.netty.handler.codec.http.HttpHeaders.Names.*; import io.netty.handler.codec.http.HttpHeaders.Values; import io.netty.handler.codec.http.HttpRequest; import static io.netty.handler.codec.http.HttpResponseStatus.*; import io.netty.handler.codec.http.HttpServerCodec; import static io.netty.handler.codec.http.HttpVersion.*; import java.net.InetAddress; import java.net.NetworkInterface; import java.util.ArrayList; import java.util.Collections; import java.util.Date; import java.util.Enumeration; import java.util.List; /** * * @author joelauer */ public class HelloDaemon { static int port; static List<String> lines; static Date startedAt; static public void main(String[] args) throws Exception { // call same as hello world HelloConsole.main(args); // was a port specified? port = 8888; if (args.length > 0) { String portString = args[0]; port = Integer.parseInt(portString); } startedAt = new Date(); lines = createLines(args); // start server EventLoopGroup bossGroup = new NioEventLoopGroup(1); EventLoopGroup workerGroup = new NioEventLoopGroup(); try { ServerBootstrap b = new ServerBootstrap(); b.option(ChannelOption.SO_BACKLOG, 1024); b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class) //.handler(new LoggingHandler(LogLevel.INFO)) .childHandler(new HttpHelloWorldServerInitializer()); Channel ch = b.bind(port).sync().channel(); // what interfaces System.out.println("In your browser visit (all possible options):"); Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces(); for (NetworkInterface netint : Collections.list(nets)) { Enumeration<InetAddress> inetAddresses = netint.getInetAddresses(); for (InetAddress inetAddress : Collections.list(inetAddresses)) { System.out.println(" http://" + inetAddress.getHostAddress() + ":" + port); } } // on shutdown... Runtime.getRuntime().addShutdownHook(new Thread() { @Override public void run() { System.out.println("Shutting down."); } }); ch.closeFuture().sync(); } finally { bossGroup.shutdownGracefully(); workerGroup.shutdownGracefully(); } } static class HttpHelloWorldServerInitializer extends ChannelInitializer<SocketChannel> { @Override public void initChannel(SocketChannel ch) { ChannelPipeline p = ch.pipeline(); p.addLast(new HttpServerCodec()); p.addLast(new HttpHelloWorldServerHandler()); } } static class HttpHelloWorldServerHandler extends ChannelInboundHandlerAdapter { @Override public void channelReadComplete(ChannelHandlerContext ctx) { ctx.flush(); } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) { if (msg instanceof HttpRequest) { HttpRequest req = (HttpRequest) msg; if (HttpHeaders.is100ContinueExpected(req)) { ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE)); } boolean keepAlive = HttpHeaders.isKeepAlive(req); String body = createBody(); FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(body.getBytes())); response.headers().set(CONTENT_TYPE, "text/html"); response.headers().set(CONTENT_LENGTH, response.content().readableBytes()); if (!keepAlive) { ctx.write(response).addListener(ChannelFutureListener.CLOSE); } else { response.headers().set(CONNECTION, Values.KEEP_ALIVE); ctx.write(response); } } } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { cause.printStackTrace(); ctx.close(); } } static public String createBody() { StringBuilder sb = new StringBuilder(); sb.append("<html>"); sb.append("<head><title>Hello Daemon!</title></head>"); sb.append("<body>"); sb.append("<h1>Hi, i am an example daemon.</h1>"); sb.append("Now: ").append(new Date()).append("<br/>"); sb.append("Started: ").append(startedAt).append("<br/>"); for (String line : lines) { sb.append(line).append("<br/>"); } sb.append("</body>"); sb.append("</html>"); return sb.toString(); } static public List<String> createLines(String[] args) { List<String> a = new ArrayList<String>(); a.add("working.dir: " + System.getProperty("user.dir")); a.add("home.dir: " + System.getProperty("user.home")); a.add("user.name: " + System.getProperty("user.name")); a.add("launcher.name: " + System.getProperty("launcher.name")); a.add("launcher.type: " + System.getProperty("launcher.type")); a.add("launcher.action: " + System.getProperty("launcher.action")); a.add("launcher.app.dir: " + System.getProperty("launcher.app.dir")); a.add("java.class.path: " + System.getProperty("java.class.path")); a.add("java.home: " + System.getProperty("java.home")); a.add("java.version: " + System.getProperty("java.version")); a.add("java.vendor: " + System.getProperty("java.vendor")); a.add("os.arch: " + System.getProperty("os.arch")); a.add("os.name: " + System.getProperty("os.name")); a.add("os.version: " + System.getProperty("os.version")); a.add("arguments:"); for (String s : args) { a.add(" - argument: " + s); } return a; } }