Spring微服务实战指南：2017版

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《Spring Microservices in Action.2017》是由John Carnell所著的一本专业书籍，专为深入理解和实践Spring框架下的微服务架构设计提供实用指导。本书是Manning出版社出版的作品，旨在帮助读者掌握在现代软件开发中如何利用Spring框架构建高效、可扩展的微服务架构。 Spring Microservices in Action是一本实战型教程，它详细介绍了如何利用Spring技术栈来构建微服务系统，包括服务发现、API Gateway、消息传递、安全性以及集成测试等方面的内容。书中涵盖了从基础概念到高级应用的各种主题，适合对Spring框架有深入了解的开发者，也适合希望转型到微服务架构或正在寻求优化现有系统的工程师。作者John Carnell以其丰富的经验和深入理解，通过实例和最佳实践，引导读者如何有效地将Spring框架与微服务模式相结合，以提升应用程序的可维护性、灵活性和可扩展性。书中可能还会探讨如何处理分布式系统中的常见挑战，如一致性、容错性和监控，以及如何通过服务编排工具（如Kubernetes）进行部署和管理。在版权方面，Manning Publications强调所有内容受版权保护，未经书面许可，不得以任何形式复制、存储或通过电子、机械方式传播。同时，书中的某些制造商和销售商产品名称可能是商标，使用时遵循了相应的商标使用规范。购买和获取更多信息可以通过Manning出版社的官方网站www.manning.com进行，对于批量订购，还可以联系出版社的Special Sales Department获取折扣。如果你对这本书有任何疑问，可以通过orders@manning.com发送电子邮件。《Spring Microservices in Action.2017》是一本不可多得的参考资料，无论是初学者还是经验丰富的开发人员，都能从中获益匪浅，提升在Spring微服务领域的专业技能。

preface

It’s ironic that in writing a book, the last part of the book you write is often the begin-

ning of the book. It’s also often the most difficult part to put down on paper. Why?

Because you have to explain to everyone why you’re so passionate about a subject that

you spent the last one and a half years of your life writing a book about it. It’s hard to

articulate why anyone would spend such a large amount of time on a technical book.

One rarely writes software books for the money or the fame.

Here’s the reason why I wrote this book: I love writing code. It’s a calling for me

and it’s also a creative activity—akin to drawing, painting, or playing an instrument.

Those outside the field of software development have a hard time understanding this.

I especially like building distributed applications. For me, it’s an amazing thing to see

an application work across dozens (even hundreds) of servers. It’s like watching an

orchestra playing a piece of music. While the final product of an orchestra is beauti-

ful, the making of it is often a lot of hard work and requires a significant amount of

practice. The same goes for writing a massively distributed application.

Since I entered the software development field 25 years ago, I’ve watched the

industry struggle with the “right” way to build distributed applications. I’ve seen dis-

tributed service standards such as

CORBA rise and fall. Monstrously big companies

have tried to push big and, often, proprietary protocols. Anyone remember Micro-

soft’s Distributed Component Object Model

(DCOM) or Oracle’s J2EE’s Enterprise

Java Beans 2 (EJB)? I watched as technology companies and their followers rushed to

build service-oriented architectures

(SOA) using heavy XML-based schemas.

In each case, these approaches for building distributed systems often collapsed

under their own weight. I’m not saying that these technologies weren’t used to build

some very powerful applications. The reality is that they couldn’t keep up with the

Licensed to Jianjun Shou <seanshou@gmail.com>

PREFACExvi

demand of the users. Ten years ago, smartphones were just being introduced to the

market and cloud computing was in the earliest stage of infancy. Also, the standards

and technology for distributed application development were too complicated for the

average developer to understand and easily use in practice. Nothing speaks truth in

the software development industry like written code. When the standards get in the

way of this, the standards quickly get discarded.

When I first heard of the microservices approach to building applications I was

more than a little skeptical. “Great, another silver-bullet approach to building distrib-

uted applications,” I thought. However, as I started diving into the concepts, I realized

the simplicity of microservices could be a game changer. A microservice architecture

focuses on building small services that use simple protocols (

HTTP and JSON) to com-

municate. That’s it. You can write a microservice with nearly any programming lan-

guage. There’s beauty in this simplicity.

However, while building an individual microservice is easy, operationalizing and

scaling it is difficult. Getting hundreds of small distributed components to work

together and then building a resilient application from them can be incredibly diffi-

cult to do. In distributed computing, failure is a fact of life and how your application

deals with it is incredibly difficult to get right. To paraphrase my colleagues Chris

Miller and Shawn Hagwood: “If it’s not breaking once in a while, you’re not building.”

It’s these failures that inspired me to write this book. I hate to build things from

scratch when I don’t have to. The reality is that Java is the lingua franca for most appli-

cation development efforts, especially in the enterprise. The Spring framework has for

many organizations become the de facto framework for most application develop-

ment. I’d already been doing application development in Java for almost 20 years (I

remember the Dancing Duke applet) and Spring for almost 10 years. As I began my

microservices journey, I was delighted and excited to watch the emergence of Spring

Cloud.

The Spring Cloud framework provides out-of-the-box solutions for many of the

common development and operational problems you’ll run into as a microservice

developer. Spring Cloud lets you use only the pieces you need and minimizes the

amount of work you need to do to build and deploy production-ready Java micro-

services. It does this by using other battle-hardened technologies from companies and

groups such as Netflix, HashiCorp, and the Apache foundation.

I’ve always considered myself an average developer who, at the end of the day, has

deadlines to meet. That’s why I undertook the project of writing this book. I wanted a

book that I could use in my day-to-day work. I wanted something with direct (and

hopefully) straightforward code examples. I always want to make sure that the mate-

rial in this book can be consumed as individual chapters or in its entirety. I hope you

find this book useful and I hope you enjoy reading it as much as I enjoyed writing it.

Licensed to Jianjun Shou <seanshou@gmail.com>

ACKNOWLEDGMENTSxviii

challenged me to become a better author. I’d also like to thank Raphael Villela and

Joshua White, my technical editors, who constantly checked my work and ensured the

overall quality of the examples and the code I produced. I’m extremely grateful for

the time, talent, and commitment each of these individuals put into into the overall

project. I’d also like to thank the reviewers who provided feedback on the manuscript

throughout the writing and development process: Aditya Kumar, Adrian M. Rossi,

Ashwin Raj, Christian Bach, Edgar Knapp, Jared Duncan, Jiri Pik, John Guthrie, Mirko

Bernardoni, Paul Balogh, Pierluigi Riti, Raju Myadam, Rambabu Posa, Sergey Evsikov,

and Vipul Gupta.

I want to close these acknowledgments with a deep sense of thanks for the love and

time my family has given me in working on this project. To my wife Janet, you have

been my best friend and the love of my life. When I’m tired and want to give up, I only

have to listen for the sound of your footsteps next to me to know that you’re always

running beside me, never telling me no, and always pushing me forward.

To my son Christopher, you’re growing up to be an incredible young man. I can-

not wait for the day when you truly discover your passion, because there will be noth-

ing in this world that can stop you from reaching your goals.

To my daughter Agatha, I’d give all the money I have to see the world through

your eyes for just 10 minutes. The experience would make me a better author and

more importantly a better person. Your intellect, your power of observation, and cre-

ativity humble me.

To my four-year-old son, Jack: Buddy, thank you being patient with me whenever I

said, “I can’t play right now because Daddy has to work on the book.” You always make

me laugh and you make this whole family complete. Nothing makes me happier than

when I see you being the jokester and playing with everyone in the family.

My race with this book is done. Like my marathon, I’ve left nothing on the table in

writing this book. I have nothing but gratitude for the Manning team and the

MEAP

readers who bought this book early and gave me so much valuable feedback. I hope in

the end that you enjoy this book as much as I enjoyed writing it. Thank you.

Licensed to Jianjun Shou <seanshou@gmail.com>

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Spring微服务实战指南：2017版

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