Shell for Grails

1.Create your application

grails create-app de.vogella.grails.guestbook 

To get started quickly with Grails it is often useful to use a feature called Scaffolding to generate the skeleton of an application. To do this use one of the generate-* commands such as generate-all, which will generate a controller (and its unit test) and the associated views:

grails generate-all Book

2.Run your application

grails run-app

3.Set Port for application

You can specify a different port by using the server.port argument:

grails -Dserver.port=8090 run-app

4.Stop the server

Stop the server via "Ctrl + C". We need the command line to create more elements.
                

5.Create your domain model

grails create-domain-class de.vogella.grails.guestbook.Feedback
grails create-domain-class de.vogella.grails.guestbook.User
grails create-domain-class de.vogella.grails.guestbook.Comment 

6.Create your controller

grails generate-controller de.vogella.grails.guestbook.Feedback
grails generate-controller de.vogella.grails.guestbook.User
grails generate-controller de.vogella.grails.guestbook.Comment 

7.Create your views

grails generate-views de.vogella.grails.guestbook.Feedback
grails generate-views de.vogella.grails.guestbook.User
grails generate-views de.vogella.grails.guestbook.Comment 

8.Run in production
Note: By default the data maintained in the web application are not stored. If you entries should be saved to the database after server shutdown use the following command to start it.

grails prod run-app

9.Create a war archive 

grails war

grails dev war  

10.Testing your application

grails test-app  

11.Create your services

grails create-service Geocoder  

II. Grails Advance

1.Creating a Date TagLib

It's time to take a stab at making the lastUpdated date look a little more user-friendly. 

The best place to put reusable snippets of code is in a custom TagLib. Type grails create-tag-lib Date. 

Add the code in Listing 11 to grails-app/taglib/DateTagLib.groovy:

import java.text.SimpleDateFormat
class DateTagLib {
 def longDate = {attrs, body ->
  //parse the incoming date
//  def b = attrs.body ?: body()

  def b = attrs.date ?: body().toString()
  if (b == "") {
   return
  }
  print b

  def d = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse(b)
  print d
   
  //if no format attribute is supplied, use this
  def pattern = attrs["format"] ?: "EEEE, MMM d, yyyy"
  out << new SimpleDateFormat(pattern).format(d)
   }
}

Now wrap the lastUpdated field in grails-app/views/entry/list.gsp 

in your newly created <g:longDate> tag

<g:each in="${entryInstanceList}" status="i" var="entryInstance">
                <div class="entry">
                <span class="entry-date"><g:longDate>${entryInstance.lastUpdated}</g:longDate></span>
                <h2><g:link action="show" id="${entryInstance.id}">${entryInstance.title}</g:link></h2>
                <p>${entryInstance.summary}</p>
                </div>  
</g:each>