通过“grails create-app”这个命令，Grails自动帮我们创建了开发所需的工程环境。其实您现在就已经拥有了一个可运行的Web应用程序，然后进入demo目录(“cd demo”)，输入“grails run-app”，回车，启动这个‘五脏俱全’的程序雏形，打开浏览器，输入 http://localhost:8080/demo ，回车，看到了吧 :) 让我们继续吧，请停止这个程序(Ctrl + C)
1，进入demo目录，在“命令行”中输入“cd demo”，回车，然后再输入“grails create-domain-class User”创建domain class即类似于pojo的pogo，它对应MVC中的Model，不过由Grails自动创建的pogo是空的，需要自己添加属性，约束（constraints）等。输出结果如下所示：
D:/Temp/grails_apps/demo>grails create-domain-class User
Welcome to Grails 0.4.2 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:/D/MY_DEV/grails
Base Directory: D:/Temp/grails_apps/demo
Environment set to production
Running script D:/D/MY_DEV/grails/scripts/CreateDomainClass.groovy
[copy] Copying 1 file to D:/Temp/grails_apps/demo/grails-app/domain
Created at D:/Temp/grails_apps/demo/grails-app/domain/User.groovy
[copy] Copying 1 file to D:/Temp/grails_apps/demo/grails-tests
Created Tests at D:/Temp/grails_apps/demo/grails-tests/UserTests.groovy
D:/Temp/grails_apps/demo>
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2，进入D:/Temp/grails_apps/demo/grails-app/domain（这个目录中存放着所有的domain class），打开User.groovy，修改为如下内容：
class User {
String name
String password
String toString() {
" $name : $password "
}
static constraints = {
name(blank: false )
password(blank: false,size: 6 .. 16 )
}
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contraints这个类变量是定义一些约束的，比如name不能为空白，password不能为空白而且长度在6到16之间（包括6和16）
3，在“命令行”中输入“grails generate-all User”，为User产生所有CRUD操作需要的代码（如控制器UserController.groovy）和页面（如list.gsp），输出结果如下所示：
D:/Temp/grails_apps/demo>grails generate-all User
Welcome to Grails 0.4.2 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:/D/MY_DEV/grails
Base Directory: D:/Temp/grails_apps/demo
Environment set to production
Running script D:/D/MY_DEV/grails/scripts/GenerateAll.groovy
Compiling sources
[delete] Deleting directory D:/Temp/grails_apps/demo/web-app/WEB-INF/grails-a
pp
[mkdir] Created dir: D:/Temp/grails_apps/demo/web-app/WEB-INF/grails-app/vie
ws
[mkdir] Created dir: D:/Temp/grails_apps/demo/web-app/WEB-INF/grails-app/i18
n
[copy] Copying 2 files to D:/Temp/grails_apps/demo/web-app/WEB-INF/grails-a
pp/views
[copy] Copied 2 empty directories to 1 empty directory under D:/Temp/grails
_apps/demo/web-app/WEB-INF/grails-app/views
[native2ascii] Converting 1 file from D:/Temp/grails_apps/demo/grails-app/i18n t
o D:/Temp/grails_apps/demo/web-app/WEB-INF/grails-app/i18n
Attempting to load [13] core plugins
Grails plug-in [i18n] with version [0.4.2] loaded successfully
Grails plug-in [quartz] with version [0.4.2] loaded successfully
Grails plug-in [core] with version [0.4.2] loaded successfully
Grails plug-in [domainClass] with version [0.4.2] loaded successfully
Grails plug-in [controllers] with version [0.4.2] loaded successfully
Attempting to load [0] user defined plugins
Grails plug-in [dataSource] with version [0.4.2] loaded successfully
Grails plug-in [codecs] with version [0.4.2] loaded successfully
Grails plug-in [hibernate] with version [0.4.2] loaded successfully
Grails plug-in [services] with version [0.4.2] loaded successfully
Grails plug-in [scaffolding] with version [0.4.2] loaded successfully
Generating views for domain class [User]
Generating list view for domain class [User]
list view generated at D:/Temp/grails_apps/demo/./grails-app/views/user/list.gsp
Generating show view for domain class [User]
Show view generated at D:/Temp/grails_apps/demo/./grails-app/views/user/show.gsp
Generating edit view for domain class [User]
Edit view generated at D:/Temp/grails_apps/demo/./grails-app/views/user/edit.gsp
Generating create view for domain class [User]
Create view generated at D:/Temp/grails_apps/demo/./grails-app/views/user/create
.gsp
Generating controller for domain class [User]
Controller generated at ./grails-app/controllers/UserController.groovy
D:/Temp/grails_apps/demo>
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