websocket聊天體驗

light-example-4j/websocket目錄有client-to-server、peer-to-peer兩個示例項目，解決了個人兩個問題：在線聊天、日誌查看。

在線聊天，後續能夠支持：最近歷史、表情+圖片

.addPrefixPath("/ws/chat", websocket(new WebSocketConnectionCallback() {
     @Override
     public void onConnect(WebSocketHttpExchange exchange, WebSocketChannel channel) {
         channel.getReceiveSetter().set(new AbstractReceiveListener() {
             @Override
             protected void onFullTextMessage(WebSocketChannel channel, BufferedTextMessage message) {
                 Set<WebSocketChannel> peerConnections = channel.getPeerConnections();
                 String msg = channel.getSourceAddress()+"/"+peerConnections.size()+": "+message.getData();
                 peerConnections.parallelStream().forEach(c -> WebSockets.sendText(msg, c, null));
                 log.info(msg);//能夠看到當前有多少人
             }
         });
         channel.resumeReceives();
     }
}))

日誌查看：使用Tailer、TailerListenerAdapter，把日誌信息推送給瀏覽器。