com.netty.HttpHelloWorldServer.java Source code

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Here is the source code for com.netty.HttpHelloWorldServer.java

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.
 */
package com.netty;

import com.netty.util.SpringUtils;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.SelfSignedCertificate;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;

/**
 * An HTTP server that sends back the content of the received HTTP request
 * in a pretty plaintext form.
 */
@SpringBootApplication
public class HttpHelloWorldServer {

    static final boolean SSL = System.getProperty("ssl") != null;
    static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "8443" : "8080"));

    private ApplicationContext applicationContext;

    private void initSpringContext(String[] args) {
        try {

            System.out.println(
                    " uri : " + System.getProperty("user.dir") + " , " + System.getProperty("java.class.path"));
            applicationContext = SpringApplication.run(HttpHelloWorldServer.class, args);
            if (applicationContext instanceof AbstractApplicationContext) {
                AbstractApplicationContext abstractAppContext = (AbstractApplicationContext) applicationContext;
                abstractAppContext.registerShutdownHook();
            }
            SpringUtils.setContext(applicationContext);
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        new HttpHelloWorldServer().start(args);

    }

    public void start(String[] args) throws Exception {

        initSpringContext(args);
        // Configure SSL.
        final SslContext sslCtx;
        if (SSL) {
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
        } else {
            sslCtx = null;
        }

        // Configure the server.
        EventLoopGroup bossGroup = new NioEventLoopGroup(1000);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                    //                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new HttpHelloWorldServerInitializer(applicationContext, sslCtx));
            b.option(ChannelOption.SO_BACKLOG, 128); // (5)
            b.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
            b.childOption(ChannelOption.SO_KEEPALIVE, true);
            b.childOption(ChannelOption.WRITE_BUFFER_HIGH_WATER_MARK, 32 * 1024);
            b.childOption(ChannelOption.WRITE_BUFFER_LOW_WATER_MARK, 8 * 1024);

            Channel ch = b.bind(PORT).sync().channel();

            System.err.println("Open your web browser and navigate to " + (SSL ? "https" : "http") + "://127.0.0.1:"
                    + PORT + '/');

            ch.closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}