Grails framework Wikipedia. Grails is an open sourceweb application framework that uses the Apache Groovy programming language which is in turn based on the Java platform. It is intended to be a high productivity framework by following the coding by convention paradigm, providing a stand alone development environment and hiding much of the configuration detail from the developer. Grails was previously known as Groovy on Rails in March 2. David Heinemeier Hansson, founder of the Ruby on Rails framework. Work began in July 2. March 2. 9, 2. 00. February 1. 8, 2. G2. One The Groovy Grails Company was acquired by Spring. Source in November 2. VMware. 3On April 9, 2. Download Getting Started With Spring Framework Pdf Files' title='Download Getting Started With Spring Framework Pdf Files' />OCI Object Computing, Inc. Graeme Rocher, Grails Co Founder and Project Lead, and Jeff Brown, Principal Software Engineer and Senior member of Grails Core Team, have joined OCI to lead its Grails product team. OCI is now the official sponsor and has taken over funding for the Grails project. The Grails core team retains full autonomy as to how the project will be developed and advanced. OvervieweditGrails was developed to address a number of goals Provide a web framework for the Java platform. RELEASE/spring-framework-reference/htmlsingle/images/overview-ejb.png' alt='Download Getting Started With Spring Framework Pdf Files' title='Download Getting Started With Spring Framework Pdf Files' />SiteMesh is a lightweight and flexible Java web application framework that applies the Gang of Four decorator pattern to allow a clean separation of content from. Our website is the source for the latest security and strategic research from the militarys link to the academic community. The Strategic Studies Institute is the. Here i show a simple java example to demonstrate how to let user download a file from website. No matter you are using struts, JSP, Spring or whatever other java. Oracle acquired Sun Microsystems in 2010, and since that time Oracles hardware and software engineers have worked sidebyside to build fully integrated systems and. Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go. Developer Spotlight Java EEthe Most Lightweight Enterprise Framework New Modular and Reusable Java EE Architecture with Docker New Special Offer Oracle. Re use existing Java technologies such as Hibernate and Spring under a single interface. Offer a consistent development framework. Offer documentation for key portions of the framework. The Persistence framework. Templates using GSP Groovy Server Pages. Dynamic tag libraries for creating web page components. Customizable and extensible Ajax support. Provide sample applications that demonstrate the framework. Provide a complete development mode, including a web server and automatic reload of resources. High productivityeditGrails has three properties that differentiate it from traditional Java web frameworks No XML configuration. Ready to use development environment. Functionality available through mixins. No XML configurationeditCreating web applications in Java traditionally involves configuring environments and frameworks at the start and during development. This configuration is very often externalized in XML files to ease configuration and avoid embedding configuration in application code. XML was initially welcomed as it provided greater consistency to configure applications. However, in recent years, it has become apparent that although XML is great for configuration, it can be tedious to set up an environment. This may reduce productivity as developers spend time understanding and maintaining framework configuration as the application grows. Adding or changing functionality in applications that use XML configuration adds an extra step to the change process, which slows down productivity and may diminish the agility of the entire process. Grails removes the need to add configuration in XML files. Instead, the framework uses a set of rules or conventions while inspecting the code of Grails based applications. For example, a class name that ends with Controller for example Book. Controller is considered a web controller. Ready to use development environmenteditWhen using traditional Java web toolkits, its up to developers to assemble development units, which can be tedious. Grails provides a development environment that includes a web server to get developers started right away. All required libraries are part of the Grails distribution and Grails prepares the Java web environment for deployment automatically. Functionality available through mixinseditGrails features dynamic methods on several classes through mixins. A mixin is a method that is added to a class dynamically, as if the functionality had been compiled into the program. These dynamic methods allow developers to perform operations without having to implement interfaces or extend base classes. Grails provides dynamic methods based on the type of class. For example, domain classes have methods to automate persistence operations like save, delete and find. Web frameworkeditThe Grails web framework has been designed according to the MVC paradigm. ControllerseditGrails uses controllers to implement the behavior of web pages. Below is an example of a controller class. Book. Controllerdeflistbooks Book. The controller above has a list action which returns a model containing all books in the database. To create this controller the grails command is used, as shown below. Book. This command creates a class in the grails appcontroller directory of the Grails project. Autocad Civil 3D Tutorial Download. Creating the controller class is sufficient to have it recognized by Grails. The list action maps to http localhost 8. Grails supports JSP and GSP. The example below shows a view written in GSP which lists the books in the model prepared by the controller above lt html lt head lt title Our bookslt title lt head lt body lt ul lt g eachinbooks lt li it. This view should be saved as grails appviewsbooklist. Grails project. This location maps to the Book. Controller and list action. Placing the file in this location is sufficient to have it recognized by Grails. There is also a GSP tag reference available. Dynamic tag librarieseditGrails provides a large number of tag libraries out of the box. However you can also create and reuse your own tag libraries easily 6class. Application. Tag. Libdefformat. Dateattrs,body outlt lt newjava. Simple. Date. Formatattrs. The format. Date tag library above formats a java. Date object to a String. This tag library should be added to the grails apptaglibApplication. Tag. Lib. groovy file or a file ending with Tag. Lib. groovy in the grails apptaglib directory. Below is a snippet from a GSP file which uses the format. Date tag library. Date formatyyyy. MMdd datemy. Date. To use a dynamic tag library in a GSP no import tags have to be used. Dynamic tag libraries can also be used in JSP files although this requires a little more work. PersistenceeditThe domain model in Grails is persisted to the database using GORM Grails Object Relational Mapping. Domain classes are saved in the grails appdomain directory and can be created using the grails command as shown below. Book. This command requests the domain class name and creates the appropriate file. Below the code of the Book class is shown class. BookStringtitle. PersonauthorCreating this class is all that is required to have it managed for persistence by Grails. With Grails 0. 3, GORM has been improved and e. The id property is used as the primary key of the corresponding table. The version property is used for optimistic locking. MethodseditWhen a class is defined as a domain class, that is, one managed by GORM, methods are dynamically added to aid in persisting the classs instances. Dynamic Instance MethodseditThe save method saves an object to the database defbooknew. Booktitle The Da Vinci Code,author Author. By. NameDan Brownbook. The delete method deletes an object from the database defbookBook. By. TitleThe Da Vinci Codebook. The refresh method refreshes the state of an object from the database defbookBook. By. TitleThe Da Vinci Codebook. The ident method retrieves the objects identity assigned from the database defbookBook. By. TitleThe Da Vinci Codedefidbook. Dynamic Static Class methodseditThe count method returns the number of records in the database for a given class defbook.