Groovy & Grails

Groovy & Grails Rain 2010-1-15

Grails vs Rails Groovy vs Ruby API documentation better than Rails Solid frameworks underneath, such as spring, hibernate Both has a active community, Rails more popular, and more jobs, more books.

Grails vs Rails DB Migrations GORM vs Active Record REST Webserver Faster than Rails, but used lot of memory, cheaper hosting Rails mature than Grails Rails release/update more often

Groovy Groovy 是一种基于 JVM 的敏捷开发语言，它结合了 Python 、 Ruby 和 Smalltalk 的许多强大的特性。支持 DSL 对于 Java 开发人员几乎没有学习难度可以编译成字节码

Hello Groovy def name='World'; println "Hello $name!"

Groovy vs Java default imports closures native syntax for lists and maps GroovyMarkup and GPath support native support for regular expressions polymorphic iteration and powerful switch statement dynamic and static typing is supported - so you can omit the type declarations on methods, fields and variables you can embed expressions inside strings lots of new helper methods added to the JDK simpler syntax for writing beans for both properties and adding event listeners safe navigation using the ?. operator, e.g. "variable?.field" and "variable?.method()" - no more nested ifs to check for null clogging up your code

Default imports java.io.* java.lang.* java.math.BigDecimal java.math.BigInteger java.net.* java.util.* groovy.lang.* groovy.util.*

Commons int[] a = {1,2,3}; -> int[] a = [1,2,3] for (int i=0; i < len; i++) {...} -> for (i in 0..len-1) {...} -> len.times {...}

Others to know Semicolons are optional You can use the this keyword inside static methods The return keyword is optional The throws clause in a method signature is not checked by the Groovy compiler You will not get compile errors like you would in Java for using undefined members or passing arguments of the wrong type.

Cloure square = { it * it } square(9) // 81 [ 1, 2, 3, 4 ].collect(square) // =[ 1, 4, 9, 16 ]

Grails 快速 Web 开发框架基于 Groovy 编程语言构建于 Spring 、 Hibernate 和其它标准 Java 框架之上高效的一站式框架

MVC Model ： Domain class Person { String name } View ： gsp 、 taglib Controller ： XxxController class PersonController { def create = {} def save = {} def view = {} }

Scaffold class XxxController { def scaffold = Domain }

GORM CRUD ： save 、 get 、 delete 、 list findBy* findAllBy* findWhere findAllWhere find(sql) count/countBy* exists list/listOrderBy withCriteria executeQuery(HSQL)

Taglib if/else/elseif/while/set/collect/each/grep/findAll meta/header/cookie pageProperty/layoutHeader/layoutTitle/layoutBody/applyLayout resource/javascript/include/render textField/textArea/radio/checkBox/form/ remoteField/formRemote/remoteLink

Service 在 grails-app/service 目录命名约定 XxxService

Testing unit Integration GroovyTestCase GrailsUnitTestCase GroovyPagesTestCase ControllerUnitTestCase TagLibUnitTestCase WebFlowTestCase

Plugins Over 340 Security ： Acegi 、 Shiro Ajax ： Prototype 、 jQuery 、 YUI 、 GWT UI ： GrailsUI 、 RichUI Report ： Dynamic Jasper Jobs ： Quartz Web 2.0: Feeds 、 Taggable 、 Commentable Workflow ： grailsflow 、 jbpm Editor ： FCKeditor

Tools IDE: Eclipse 3.5 、 NetBeans 6.8 、 IDEA 9 、 Spring STS 2.3.0 Editor ： E-Texteditor 、 Textmate 、 GEdit Build ： Maven 、 Ant 、 Ivy WebContainer ： Tomcat 、 Jetty Database ： HSQL 、 MySQL GRAG

Tutorials Mastering Grails @ IBM developerWorks Cookbook Tutorials Articles Twitter and Google Maps mashup in 20 minutes with Grails Securing a Grails application using Spring and Acegi Security A Grails-Powered Blog (Part 1) A Grails-Powered Blog (Part 2)

Presentations http://grailspodcast.com/blog/list Grails JavaOne 2006 Slides Groovy & Grails Seminar Bending GORM: 5-minute Techniques for Enterprise Integration Grails 1.1 Testing - Unit, Integration, Functional (July 2009) Getting Started with Grails

Roadmap Grails 1.3 support groovy 1.7 ， standalone GSP ， Deployment and resolution of plugins from Maven repositories Grails 2.0 modular deployment with OSGi

App grails.org http://grails.org groovyblogs.org http://www.groovyblogs.org/ Weceem CMS http://www.weceem.org/ Groller http://code.google.com/p/rainboyan/

Demo Grails HelloWorld: 1) grails create-app helloworld 2) grails create-controller hello 3) edit HelloController.groovy 4) create say.gsp 5) grails run-app

Links http://www.grails.org http://www.grails.org/Tutorials http://www.jtict.com/blog/grails-vs-rails/ http://www.grails.org/GRAG

Groovy & Grails

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Groovy & Grails