使用下面命令启动服务器： ~~~ mvn -PChatServer clean package exec:exec ~~~ 其中项目中的 pom.xml 是配置了 9999 端口。你也可以通过下面的方法修改属性 ~~~ mvn -PChatServer -Dport=1111 clean package exec:exec ~~~ 下面是控制台的主要输出(删除了部分行) Listing 11.5 Compile and start the ChatServer ~~~ [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building ChatServer 1.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ ... [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ netty-in-action --- [INFO] Building jar: D:/netty-in-action/chapter11/target/chat-server-1.0-SNAPSHOT.jar [INFO] [INFO] --- exec-maven-plugin:1.2.1:exec (default-cli) @ chat-server --- Starting ChatServer on port 9999 ~~~ 可以在浏览器中通过 http://localhost:9999 地址访问程序。图11.5展示了此程序在Chrome浏览器下的用户界面。 Figure 11.5 WebSockets ChatServer demonstration [](https://github.com/waylau/essential-netty-in-action/blob/master/images/Figure%2011.5%20WebSockets%20ChatServer%20demonstration.jpg) 图中显示了两个已经连接了的客户端。第一个客户端是通过上面的图形界面连接的，第二个是通过Chrome浏览器底部的命令行连接的。 你可以注意到，这两个客户端都在发送消息，每条消息都会显示在两个客户端上。 ### [](https://github.com/waylau/essential-netty-in-action/blob/master/NETTY%20BY%20EXAMPLE/Testing%20the%20Application.md#如何加密)如何加密？ 在实际场景中，加密是必不可少的。在Netty中实现加密并不麻烦，你只需要向 ChannelPipeline 中添加 SslHandler ，然后配置一下即可。如下： Listing 11.6 Add encryption to the ChannelPipeline ~~~ public class SecureChatServerIntializer extends ChatServerInitializer { //1 private final SslContext context; public SecureChatServerIntializer(ChannelGroup group, SslContext context) { super(group); this.context = context; } @Override protected void initChannel(Channel ch) throws Exception { super.initChannel(ch); SSLEngine engine = context.newEngine(ch.alloc()); engine.setUseClientMode(false); ch.pipeline().addFirst(new SslHandler(engine)); //2 } } ~~~ 1.扩展 ChatServerInitializer 来实现加密 2.向 ChannelPipeline 中添加SslHandler 最后修改 ChatServer，使用 SecureChatServerInitializer 并传入 SSLContext Listing 11.7 Add encryption to the ChatServer ~~~ public class SecureChatServer extends ChatServer {//1 private final SslContext context; public SecureChatServer(SslContext context) { this.context = context; } @Override protected ChannelInitializer<Channel> createInitializer(ChannelGroup group) { return new SecureChatServerIntializer(group, context); //2 } public static void main(String[] args) throws Exception{ if (args.length != 1) { System.err.println("Please give port as argument"); System.exit(1); } int port = Integer.parseInt(args[0]); SelfSignedCertificate cert = new SelfSignedCertificate(); SslContext context = SslContext.newServerContext(cert.certificate(), cert.privateKey()); final SecureChatServer endpoint = new SecureChatServer(context); ChannelFuture future = endpoint.start(new InetSocketAddress(port)); Runtime.getRuntime().addShutdownHook(new Thread() { @Override public void run() { endpoint.destroy(); } }); future.channel().closeFuture().syncUninterruptibly(); } } ~~~ 1.扩展 ChatServer 2.返回先前创建的 SecureChatServerInitializer 来启用加密 这样，就在所有的通信中使用了 [SSL/TLS](http://tools.ietf.org/html/rfc5246) 加密。和前面一样，你可以使用Maven拉取应用需要的所有依赖，并启动它，如下所示。 Listing 11.8 Start the SecureChatServer ~~~ $ mvn -PSecureChatServer clean package exec:exec [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building ChatServer 1.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ ... [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ netty-in-action --- [INFO] Building jar: D:/netty-in-action/chapter11/target/chat-server-1.0-SNAPSHOT.jar [INFO] [INFO] --- exec-maven-plugin:1.2.1:exec (default-cli) @ chat-server --- Starting SecureChatServer on port 9999 ~~~ 现在你可以通过 HTTPS 地址: https://localhost:9999 来访问SecureChatServer 了。