掌握Clojure Web开发基础：构建高效应用

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"《Web开发基础：Clojure编程入门》是一本由Ryan Baldwin编写的教程，专为希望学习并实践Web开发的读者设计。该书深入浅出地讲解了如何利用Clojure这门强大的编程语言来构建自己的Web应用程序。Clojure是一种函数式编程语言，以其简洁、高效和高生产力的特点在Web开发领域崭露头角。本书涵盖了Clojure Web开发的核心概念和技术，包括但不限于： 1. **Clojure语言基础**：首先介绍Clojure的语言特性，如轻量级的语法、强大的元编程能力以及与Java的互操作性，让读者对Clojure有一个全面的了解。 2. **服务器端编程**：通过Clojure的Ring库，读者将学习如何设置和管理Web服务器，以及如何处理HTTP请求和响应。 3. **数据持久化**：探讨如何利用Clojure与数据库（如PostgreSQL或MySQL）交互，实现数据存储和检索。 4. **Web框架**：了解如何利用Compojure或Ring-Clojure-Compojure等框架构建RESTful API和Web应用的结构。 5. **路由和视图**：构建动态网站的核心部分，包括URL路由、参数处理和模板引擎的使用。 6. **测试与调试**：学会编写单元测试和集成测试，确保代码质量和性能，并掌握故障排查技巧。 7. **部署与维护**：讨论如何将Clojure应用部署到云端环境，如Heroku或Docker，以及持续集成/持续部署（CI/CD）的最佳实践。 8. **实战项目**：书中还包含实际项目的例子，帮助读者通过实践巩固所学知识，并理解如何将理论应用到实际工作中。《Clojure Web Development Essentials》版权属Packt Publishing所有，强调了知识产权的重要性，提醒读者未经许可不得复制或传播内容。尽管作者和出版商已尽最大努力保证信息准确，但本书不提供任何形式的保修，且不对因使用本书引发的任何损失或损害承担责任。 Packt Publishing在本书中尽可能提供了关于涉及公司和产品的商标信息，但不能保证其准确性。本书首次出版于2015年2月，反映了当时的最佳实践和Clojure语言的最新发展。对于想要探索Clojure作为Web开发工具的读者来说，这本书是一个理想的起点，它将带领你进入这个高效且富有挑战性的编程世界。"

Preface

Clojure is a beautiful, concise language, and its adoption for web applications is ready

and about to explode. In Clojure Web Development Essentials, you will learn how to build

a Clojure web application from scratch using the Leiningen build tool and the Luminus

application template. We'll start by creating a simple example application in the rst

few pages of the rst chapter, and build on that application with each subsequent

chapter. We'll cover URL routing, template rendering, database connectivity, form

validation, and everything else we need to build a typical web app. By the end of

this book, you'll have the knowledge required to venture into the world of web

development, and you'll be able to use your skills for the betterment of the Internet.

What this book covers

Chapter 1, Getting Started with Luminus, guides you through creating a new project

using the Luminus application template. We'll then dive into what was generated,

what the out-of-the-box project dependencies are, and the general le structure of

a Luminus web app.

Chapter 2, Ring and the Ring Server, describes the core technologies driving our

application, and shows you how to use the development web server.

Chapter 3, Logging, demonstrates conguration of some basic logging and the

Clojure logging library, Timbre.

Chapter 4, URL Routing and Template Rendering, starts to dive into the important

part of web applications. It shows you how to handle incoming requests using

Compojure, and how to render web pages using the Selmer templating engine.

We'll also create a sign-up form for our application.

Chapter 5, Handling Form Input, teaches you how to validate form data and report

form validation errors back to the user.

Preface

[ 2 ]

Chapter 6, Testing in Clojure, is a quick tour of automated testing and its use in Clojure.

Chapter 7, Getting Started with the Database, is the rst of three chapters covering

database management and interactivity. We'll set up our application's database, and

you will learn how to manage your database schema using the Migratus Leiningen

plug. Then we will store the form input created in the fth chapter using YeSQL.

Chapter 8, Reading Data from the Database, continues exploring database interactivity by

teaching you how to retrieve data from the database using YeSQL. We'll then create a

couple of new web pages that list the most recently added items in our database.

Chapter 9, Database Transactions, gives us a brief overview of what database transactions

are. We'll then create a form that transactionally inserts data into multiple tables.

Chapter 10, Sessions and Cookies, demonstrates how sessions and cookies are managed

and maintained in Noir. We'll then create an authentication form for our application,

and save a cookie in the user's browser to remember their username the next time

they log in.

Chapter 11, Environment Conguration and Deployment, guides us through abstracting

our environment conguration (such as database connectivity) and describes a few

common ways by which we can deploy our application.

Appendix, Using Korma – a Clojure DSL for SQL, covers the modication of the YeSQL

model layers to use Korma, a native Clojure Domain Specic Language that can be

used to interact with the database if you're not keen on using raw SQL.

What you need for this book

First and foremost, you must be familiar with the Clojure programming language.

You'll also need to install the Leiningen build tool. Familiarity with basic web

technology is also valuable.

Who this book is for

This book targets software developers who are already using Clojure but want to use

their skill set for web applications. Very little of this book does any fancy frontend

development, and most of it focuses on server-side development. If you're primarily

a frontend developer, or have never heard of Clojure, this book is precisely not what

you are looking for.

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