Java入门指南：开发Google App Engine应用

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"《精通Java™ Google App Engine》是一本专为Web开发者介绍如何利用Java技术在Google App Engine上构建应用程序的权威指南。本书由经验丰富的作者Kyle Roche和Jeff Douglas共同撰写，旨在帮助读者深入理解Google App Engine SDK的核心组件、平台架构和服务特性。随着云计算时代的来临，本书不仅介绍了基础概念，还涵盖了从入门到实践的全面教程。 Google App Engine（GAE）是Google提供的一个基于云计算的开发平台，它简化了网站和应用的部署流程，允许开发者无需管理服务器基础设施，就能轻松地将应用程序部署到Google的庞大网络中。本书的内容涵盖以下几个关键知识点： 1. Google App Engine SDK：书中详细介绍了如何安装和配置SDK，以便于在本地开发环境中搭建与Google云环境类似的环境，方便进行代码编写和调试。 2. 平台架构：读者将学习到GAE如何通过Google的分布式基础设施处理请求，包括自动扩展、数据存储（如Datastore和Blobstore）、以及API管理等核心功能。 3. Java技术运用：作为标题所强调的，本书重点讲解如何使用Java语言开发高效、可扩展的应用程序，包括服务端编程、异常处理、安全性等方面。 4. 服务和框架：书中还会探讨GAE提供的各种服务，如电子邮件、身份验证、任务队列等，以及如何利用它们构建功能完备的应用程序。 5. 实战项目：通过一系列的实例和项目，读者将有机会将理论知识转化为实际操作，提升编程技能和云应用开发经验。 6. 版权和使用授权：最后，关于版权信息，强调了所有权利保留，并规定了未经许可的复制或传播的具体规则。《Begin Java™ Google App Engine》是Java开发者转向云端应用开发的实用教材，无论是对云平台的初学者还是有一定经验的开发者，都能从中获益匪浅。随着云计算的日益普及，掌握Google App Engine对于提升职业竞争力具有重要意义。"

■ FOREWORD

xiv

connect it to App Engine Java Data Objects, and debug everything end to end, all

from within Eclipse.

3. Instant deployment, cloud scalability

Traditional application developers allocate up to one third of their total development

time to deployment into a production environment. Your first App Engine app will

deploy from your local development environment to Google's world-class, cloud-

scale production infrastructure, all with a press of a button. And your application can

scale from its first user to its millionth user with complete elasticity, literally running

on the same infrastructure as the highest traffic sites on the Internet.

The implications?

Given Google App Engine's new capabilities, we've been excited to add it to the set of

tools that we use at Appirio to help our enterprise customers do more with the cloud.

App Engine fills a recognized gulf between the two leading cloud platforms, Force.com

and Amazon Web Services. Force.com is a rich business application platform with built-

in business objects that allow applications to inherit a broad swath of functionality. But

some applications don't require this functionality and would benefit from having greater

control and direct access to "lower levels" of the platform. At the other end of the

spectrum, Amazon Web Services, in particular S3 and EC2, give application developers

the power to control their own infrastructure without the headaches of hardware

ownership. But many applications don't require this level of control of the infrastructure;

a higher level of abstraction would make development much more efficient.

We see Google App Engine as filling the void between these two leading

platforms. App Engine offers more control than you get from working in a Force.com

environment. And App Engine offers abstraction over several layers of infrastructure

that we'd prefer not to deal with in the applications that we build today on EC2, so,

for example, we don’t have to worry about the size of the machine we spin up.

The best part is that these technologies are almost completely complementary,

and toolkits exist to ease their interoperability. At an event this year, someone posed

the following question: “Is the industry on the verge of a new set of platform wars? Or

will all the different cloud platforms create an interwoven fabric of web applications

that draw from each cloud as is convenient?" We believe firmly in the latter. After all,

the real “platform war” is still against the old paradigm. Most developers out there

don’t know that they don’t need to buy hardware and software anymore in order to

develop and deploy world-class web applications.

But you will. Enjoy this introduction to the new world of developing on Google’s

App Engine. We look forward to seeing the applications that you develop!

Ryan Nichols

V.P. Cloud Strategy, Appirio

Download at WoweBook.Com

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