HTML5 WebSocket实战：构建实时应用指南

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《WebSocket.Essentials：利用HTML5构建实时应用》是一本由Varun Chopra编著的IT技术书籍，由Packt Publishing在2015年4月30日出版。本书专为希望学习和运用WebSocket技术来开发现代浏览器兼容的有趣应用的Web开发者设计，特别是那些想结合HTML5功能创建实时协作应用的开发者。书中详尽介绍了WebSocket的基础和在HTML5环境下的应用，着重于使用Node.js服务器实现WebSocket服务器的搭建和实际操作。作者首先引导读者理解Web的基础概念，包括Web的应用类型、WebSocket相对于其他通信方法的优势、现代浏览器的特点，以及HTML5的最新标准，如多媒体支持（音频/视频）、Canvas绘图、表单元素、语义化、移动优先设计、离线存储、地理位置服务、拖放功能和Web Workers等。第二章“Getting Started with WebSockets”探讨了WebSocket的重要性，何时选择使用WebSocket，以及其工作原理。WebSocket API的关键概念，如连接状态和事件处理，都通过实际的“Echo Test”示例进行演示。读者将学会如何在客户端应用程序中初始化WebSocket、添加事件监听、发送和接收消息，以及管理连接关闭。本书的核心内容涵盖了建立WebSocket服务器的配置，以及将其应用于真实场景中的实时数据传输。第五章专门讨论了如何在移动设备和平板电脑上使用WebSocket，并通过一个实时绘画应用实例来展示其在HTML5中的应用。第六章则进一步探讨如何利用现代工具提升HTML5 web应用的开发效率。通过阅读本书，读者不仅能够掌握WebSocket技术，还能增强对HTML5的理解，为构建高效、实时的网络应用打下坚实基础。书中的实例和实践将帮助开发者更好地理解WebSocket在现代Web开发中的角色，并能灵活地将其融入到自己的项目中。

Conventions

In this book, you will find a number of text styles that distinguish between different kinds of

information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames,

dummy URLs, user input, and Twitter handles are shown as follows: "Here, Host is the name of the

server that we are hitting."

A block of code is set as follows:

<html>

<head>

<title>WebSocket Test</title>

var wsUri = "ws://echo.websocket.org/";

var output;

New terms and important words are shown in bold. Words that you see on the screen, for

example, in menus or dialog boxes, appear in the text like this: "Take a look at the Console log in

the left-hand-side window."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.

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Questions

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Chapter 1. Introducing the World of Web App

Web application development has reached the next level with HTML5 and WebSockets. The

revolutionary enhancements in web development technologies have equipped developers with

modern tools and techniques. Using WebSockets they can create web applications which can send

data not only from the client side but from the server side as well. Web applications with real-time

data transfer can be created with a lot lower use of bandwidth. WebSockets by complementing

HTML5 enhanced feature can make future applications powerful. Let's talk about the basics of the

Web before understanding WebSockets in detail.

What is the Web?

The foundation of the Web was laid in the late eighties. The Web works on interlinked hypertext

documents that we can access using the Internet. A browser plays a vital role in reading and

converting these hypertext documents into a readable and more meaningful format, which we call

web pages. HTML5 is the hypertext document which the browser reads and renders for us. The

browser not only reads and renders but also creates a Document Object Model (DOM) for us so

that we can read and manipulate the structure easily. Dynamic manipulation of the DOM can be

achieved by the JavaScript language, which is a standard scripting language for HTML. A server

plays a vital role in the functioning of the Web. We mainly consider the Web to be divided into two

parts: client and server. Client is considered to be the browser whereas server is the one who gives

client the data.

Let's see how the Web works:

1. Browser requests a URL from server.

2. Server checks and returns the HTML file.

3. Browser engine draws the page.

In a nutshell, this is how the Web works. Browsers and servers are the most important entities of the

Web. Browsers have engines that read HTML files and render web applications in the way HTML

files are described. Different browsers such as Blink, Trident, Gecko, WebKit, and so on, have

different engines to render the HTML of a page. Now servers are the one who are storing all the data

and providing the same on user request.

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HTML5 WebSocket实战：构建实时应用指南

java_websocket.jar

websocket.jar.zip

websocket.jar+catalina.jar

vue websocket.io

websocket.js文件下载

javax.websocket.jar下载

WebSocket.server怎么用

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.websocket.servlet.TomcatWebSocketServletAutoConfiguration

javax.websocket.server.ServerContainer not available

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