网上关于这次配置的参考资料很少，特此记录以备不时之需…

关于Spring Boot中使用Jetty容器开启HTTP2的配置

说明

1. 使用的Spring Boot版本为：1.5.9.RELEASE；
2. Jetty容器从9.0版本开始支持HTTP/2协议；

配置步骤

1. 在pom文件中添加依赖：

   <dependency>
       <groupId>org.eclipse.jetty.http2</groupId>
       <artifactId>http2-server</artifactId>
   </dependency>
   
   <!-- 可选 -->
   <dependency>
       <groupId>org.eclipse.jetty.http2</groupId>
       <artifactId>http2-client</artifactId>
   </dependency>
   
   <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-alpn-server</artifactId>
   </dependency>
   
   <!-- 可选 -->
   <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-alpn-client</artifactId>
   </dependency>
   

2. 在配置类中添加如下配置代码：

   @Bean
   @Autowired
   public JettyEmbeddedServletContainerFactory embeddedServletContainerFactory(ServerProperties serverProperties) {
   
       JettyEmbeddedServletContainerFactory factory = new JettyEmbeddedServletContainerFactory();
       JettyServerCustomizer customizer = new JettyServerCustomizer() {
   
           @Override
           public void customize(Server server) {
               if ((serverProperties.getSsl() != null) && serverProperties.getSsl().isEnabled()) {
                   ServerConnector connector = (ServerConnector) server.getConnectors()[0];
                   int port = connector.getPort();
                   SslContextFactory sslContextFactory = connector.getConnectionFactory(SslConnectionFactory.class).getSslContextFactory();
                   HttpConfiguration httpConfiguration = connector.getConnectionFactory(HttpConnectionFactory.class).getHttpConfiguration();
                   configureSslContextFactory(sslContextFactory);
   
                   ConnectionFactory[] connectionFactories = createConnectionFactories(sslContextFactory, httpConfiguration);
                   ServerConnector serverConnector = new ServerConnector(server, connectionFactories);
                   serverConnector.setPort(port);
   
                   server.setConnectors(new Connector[] { serverConnector });
               }
           }
   
           private void configureSslContextFactory(SslContextFactory sslContextFactory) {
               sslContextFactory.setCipherComparator(HTTP2Cipher.COMPARATOR);
               //sslContextFactory.setUseCipherSuitesOrder(true);
           }
   
           private ConnectionFactory[] createConnectionFactories(SslContextFactory sslContextFactory, HttpConfiguration httpConfiguration) {
               SslConnectionFactory sslConnectionFactory = new SslConnectionFactory(sslContextFactory, "alpn");
               ALPNServerConnectionFactory alpnServerConnectionFactory = new ALPNServerConnectionFactory("h2", "h2-17", "h2-16", "h2-15", "h2-14");
               HTTP2ServerConnectionFactory http2ServerConnectionFactory = new HTTP2ServerConnectionFactory(httpConfiguration);
               return new ConnectionFactory[] { sslConnectionFactory, alpnServerConnectionFactory, http2ServerConnectionFactory };
           }
       };
       factory.addServerCustomizers(customizer);
       return factory;
   }
   

如何判断网站是否使用HTTP/2

1. chrome://net-internals/#http2，在浏览器输入chrome://net-internals/打开网络观察组件，然后选择HTTP/2；

2. chrome.loadTimes，支持http2的chrome版本，可通过其提供的chrome.loadTimes API来进行判断，适用于所有的chrome内核；

   //参考代码：JS版本
   (function(){
       // 保证这个方法只在支持loadTimes的chrome浏览器内核下执行
       if(window.chrome && typeof chrome.loadTimes === 'function') {
           var loadTimes = window.chrome.loadTimes();
           var spdy = loadTimes.wasFetchedViaSpdy;
           var info = loadTimes.npnNegotiatedProtocol || loadTimes.connectionInfo;
           // 将h2作为判断标识
           if(spdy && /^h2/i.test(info)) {
               return console.info('本站点使用了HTTP/2');
           }
       }
       console.warn('本站点没有使用HTTP/2');
   })();
   

参考资料

1. http://blog.csdn.net/chenmoquan/article/details/76906524