Groovy轻松入门——Grails实战之Web Flow篇
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摘要:Spring Web Flow是Spring家族中的一位成员,他能简化Web应用的开发。在Grails0.6中就集成了Spring Web Flow这一Web应用开发利器。下面通过一个实例向大家展示一下在Grails中如何方便的使用Spring Web Flow。
Spring Web Flow是Spring家族中的一位成员,他能简化Web应用的开发。在Grails0.6中就集成了Spring Web Flow这一Web应用开发利器。下面通过一个实例向大家展示一下在Grails中如何方便的使用Spring Web Flow。
1,“grails create-app WebFlowDemo”,输出如下:
D:/_DEV/grails_apps>grails create-app WebFlowDemo2,“cd WebFlowDemo”,进入工程目录Welcome to Grails 0.6 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:/D/MY_DEV/grails0.6Base Directory: D:/_DEV/grails_apps
Environment set to development
Note: No plugin scripts found
Running script D:/D/MY_DEV/grails0.6/scripts/CreateApp.groovy
Overriding previous definition of reference to groovyJarSet
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/src
[mkdir] Created dir:D:/_DEV/grails_apps/WebFl
owDemo/src/java
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/src/groovy
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/controllers
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/services
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/domain
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/taglib
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/utils
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/views
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/views/layouts
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/i18n
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/conf
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/test
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/test/unit
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/test/integration
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/scripts
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/js
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/css
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/images
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/classes
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/META-INF
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/lib
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/conf/spring
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/grails-app/conf/hibernate
[propertyfile] Creating new property file:D:/_DEV/grails_apps/WebFlowDemo/application.properties
[copy] Copying 2 files toD:/_DEV/grails_apps/WebFlowDemo
[copy] Copying 2 files toD:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF
[copy] Copying 5 files toD:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/tld
[copy] Copying 131 files toD:/_DEV/grails_apps/WebFlowDemo/web-app
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo/grails-app/conf
[copy] Copying 13 files toD:/_DEV/grails_apps/WebFlowDemo/grails-app
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo/grails-app/conf/spring
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo
[propertyfile] Updating property file:D:/_DEV/grails_apps/WebFlowDemo/application.properties
Created Grails Application at D:/_DEV/grails_apps/WebFlowDemo
D:/_DEV/grails_apps>
3,“grails create-domain-class User”,创建一个域类User,输出如下
D:/_DEV/grails_apps/WebFlowDemo>grails create-domain-class UserWelcome to Grails 0.6 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:/D/MY_DEV/grails0.6Base Directory: D:/_DEV/grails_apps/WebFlowDemo
Environment set to development
Note: No plugin scripts found
Running scriptD:/D/MY_DEV/grails0.6/scripts/CreateDomainClass.groovy
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo/grails-app/domain
Created for User
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo/test/integration
Created Tests for User
D:/_DEV/grails_apps/WebFlowDemo>
4,将grails-app/domain/User.groovy修改为如下内容:
class User implements Serializable {
String username
String password
}
5,“grails generate-all User”,生成所有与域类User相关的目录和文件,输出如下
D:/_DEV/grails_apps/WebFlowDemo>grails generate-all UserWelcome to Grails 0.6 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:/D/MY_DEV/grails0.6Base Directory: D:/_DEV/grails_apps/WebFlowDemo
Environment set to development
Note: No plugin scripts found
Running scriptD:/D/MY_DEV/grails0.6/scripts/GenerateAll.groovy
[mkdir] Created dir:C:/Documents and Settings/Daniel/.grails/0.6/projects/WebFlowDemo/classes
Compiling 5 source files toC:/Documents and Settings/Daniel/.grails/0.6/projects/WebFlowDemo/classes
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/grails-app/i18n
[copy] Copying 8 files toD:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/grails-app/i18n
[copy] Copying 1 file toD:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/spring
[copy] Copying 1 file toC:/Documents and Settings/Daniel/.grails/0.6/projects/WebFlowDemo/classes
[copy] Copying 1 file toC:/Documents and Settings/Daniel/.grails/0.6/projects/WebFlowDemo/classes
Generating views for domain class User
Generating controller for domain class User
Finished generation for domain class User
D:/_DEV/grails_apps/WebFlowDemo>
6,将grails-app/controllers/UserController.groovy修改为如下内容
class UserController {
def index = { redirect(action:list,params:params) }// the delete, save and update actions only accept POST requests
def allowedMethods =[delete: ' POST ' , save: ' POST ' , update: ' POST ' ]
def list = {
if ( ! params.max)params.max = 10
[ userList: User.list( params ) ]
}def show = {
[ user : User.get( params.id ) ]
}def delete = {
def user = User.get( params.id )
if (user) {
user.delete()
flash.message = " User ${params.id} deleted. "
redirect(action:list)
}
else {
flash.message =" User not found with id ${params.id} "
redirect(action:list)
}
}def edit = {
def user = User.get( params.id )if ( ! user) {
flash.message =" User not found with id ${params.id} "
redirect(action:list)
}
else {
return [ user : user ]
}
}def update = {
def user = User.get( params.id )
if (user) {
user.properties = params
if (user.save()) {
flash.message =" User ${params.id} updated. "
redirect(action:show,id:user.id)
}
else {
render(view: ' edit ' ,model:[user:user])
}
}
else {
flash.message =" User not found with id ${params.id} "
redirect(action:edit,id:params.id)
}
}def create = {
def user = new User()
user.properties = params
return [ ' user ' :user]
}def save = {
def user = new User()
user.properties = params
if (user.save()) {
flash.message =" User ${user.id} created. "
redirect(action:show,id:user.id)
}
else {
render(view: ' create ' ,model:[user:user])
}
}def loginSystemFlow = {
login {
on( " login " ) {
if ( " daniel "!= params.username || " 123 "
!= params.password) {
flash.message =" username or password is invalid "
def user = new User()
user.properties = params
flash.user = userreturn error ()
} else {
// 仅仅用来演示如何使用flow scope
flow.message ="Welcome, ${params.username}"
}
}.to "ok"
on("register").to "showRegisterView"
}
ok()
showRegisterView()
}
}
on("login"){...}.to "ok"表示点击login按钮后所要去的页面为ok,如果验证失败("daniel" != params.username || "123" != params.password),则利用内置的error(),使用户返回login页面;而on("register").to "showRegisterView"是类似的,不再累述。
7,在grails-app/views/user/目录下新建一个名为“loginSystem”的子目录,该名称为UserController.groovy中的loginSystemFlow的“loginSystem”相对应。
8,在grails-app/views/user/loginSystem/目录下新建login.gsp,ok.gsp,showRegisterView.gsp三个GSP文件(这三个文件的文件名与
def loginSystemFlow = {
login {
...
}
ok()
showRegisterView()
}
中粗体突显的state名相对应,其中login为start state,而ok和showRegisterView为end state) ,并将其内容修改为:
login.gsp
< html >
< head >
< meta http-equiv ="Content-Type"content ="text/html; charset=UTF-8" />
< meta name ="layout" content ="main" />
< title > Login Page </ title >
</ head >
< body >
< div class ="nav" >
< span class ="menuButton" >< a class ="home"
href ="${createLinkTo(dir:'')}" > Home </ a >
</ span >
</ div >
< div class ="body" >
< h1 >
Login Page
</ h1 >
< g:if test ="${message }" >
< div class ="message" >
${message }
</ div >
</ g:if >
< g:form action ="loginSystem" method ="post" >
< div class ="dialog" >
< table >
< tbody >
< tr class ='prop' >
< td valign ='top' class ='name' >
< label for ='username' >
Username:
</ label >
</ td >
< td valign ='top' class ='value${hasErrors(bean:user,field:'username','errors')}' >
< input type ="text"id ='username' name ='username'
value ="${user?.username?.encodeAsHTML()}" />
</ td >
</ tr >
< tr class ='prop' >
< td valign ='top' class ='name' >
< label for ='password' >
Password:
</ label >
</ td >
< td valign ='top' class ='value ${hasErrors(bean:user,field:'password','errors')}' >
< input type ="text"id ='password' name ='password'
value ="${user?.password?.encodeAsHTML()}" />
</ td >
</ tr >
</ tbody >
</ table >
</ div >
< div class ="buttons" >
< span class ="button" >< g:submitButton class ="save"
name ="login" value ="Login" ></ g:submitButton >
</ span >
</ div >
< g:link action ="loginSystem" event ="register" >Register </ g:link >
</ g:form >
</ div >
</ body >
</ html >ok.gsp
${message } < br />< g:link action ="loginSystem" > back to login page </ g:link >
showRegisterView.gsp
This is a register page < br />
< g:link action ="loginSystem" > back to login page </ g:link >
9,“grails run-app”,启动Grails应用,输出如下
D:/_DEV/grails_apps/WebFlowDemo>grails run-appWelcome to Grails 0.6 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:/D/MY_DEV/grails0.6Base Directory: D:/_DEV/grails_apps/WebFlowDemo
Environment set to development
Note: No plugin scripts found
Running script D:/D/MY_DEV/grails0.6/scripts/RunApp.groovy
[mkdir] Created dir:D:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/lib
Compiling 1 source files toC:/Documents and Settings/Daniel/.grails/0.6/projects/WebFlowDemo/classes
Running Grails application..
2007-09-08 00:12:24.443::INFO: Logging to STDERR via org.mortbay.log.StdErrLog
2007-09-08 00:12:24.521::INFO: jetty-6.1.4
2007-09-08 00:12:26.425:/WebFlowDemo:INFO: Set web app root system property: '@grails.project.key@'
= [D:/_DEV/grails_apps/WebFlowDemo/web-app/]
2007-09-08 00:12:26.425:/WebFlowDemo:
INFO: Initializing Log4J from
[D:/_DEV/grails_apps/WebFlowDemo/web-app/WEB-INF/classes/log4j.properties]
2007-09-08 00:12:26.472:/WebFlowDemo:INFO: Loading Spring root WebApplicationContext
[9282] hibernate.ConfigurableLocalSessionFactoryBeanBuilding new Hibernate SessionFactory
[9922] mvc.GrailsUrlHandlerMapping Neither 'urlMap'nor 'mappings' set on SimpleUrlHandlerMapping
[12750] commons.GrailsConfigUtils [GrailsContextLoader] Grails application loaded.
[12797] mvc.GrailsWebRequestFilter Initializing filter 'grailsWebRequest'
[12797] mvc.GrailsWebRequestFilter Filter 'grailsWebRequest' configured successfully
[12797] filter.UrlMappingsFilter Initializing filter 'urlMapping'
[12797] filter.UrlMappingsFilter Initializing filter 'urlMapping'
[12797] filter.UrlMappingsFilter Filter 'urlMapping' configured successfully
[12797] filter.UrlMappingsFilter Filter 'urlMapping' configured successfully
[12797] filter.GrailsReloadServletFilter Initializing filter 'reloadFilter'
[12797] filter.GrailsReloadServletFilter Filter 'reloadFilter' configured successfully
[12891] servlet.GrailsDispatcherServlet Initializing servlet 'grails'
[12954] servlet.GrailsDispatcherServletFrameworkServlet 'grails': initialization started
2007-09-08 00:12:36.562:/WebFlowDemo:INFO: Loading WebApplicationContext for Spring FrameworkServlet 'grails'
[13485] servlet.GrailsDispatcherServletUsing context class [org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext]
for servlet 'grails'
[13485] servlet.GrailsDispatcherServletUsing MultipartResolver [org.springframework.web.multipart
.commons.CommonsMultipartResolver@dd7404]
[13485] servlet.GrailsDispatcherServletUsing LocaleResolver [org.springframework.web.servlet.i18n.SessionLocaleResolver@ebbf5c]
[13500] servlet.GrailsDispatcherServletUnable to locate ThemeResolver with name 'themeResolver':
using default [org.springframework.web.servlet.
theme.FixedThemeResolver@192c766]
[13516] servlet.GrailsDispatcherServletNo HandlerAdapters found in servlet 'grails': using default
[13532] servlet.GrailsDispatcherServletUnable to locate RequestToViewNameTranslator with name 'viewNameTranslator':
using default [org.springfra
mework.web.servlet.view.DefaultRequestToViewNameTranslator@a40575]
[13532] servlet.GrailsDispatcherServletUsing MultipartResolver
[org.springframework.web.multipart.commons.CommonsMultipartResolver@dd7404]
[13532] servlet.GrailsDispatcherServletFrameworkServlet 'grails': initialization completed in 578 ms
[13532] servlet.GrailsDispatcherServlet Servlet 'grails' configured successfully
2007-09-08 00:12:37.374::INFO: Started SelectChannelConnector@0.0.0.0:8080
Server running. Browse to http://localhost:8080/WebFlowDemo
10,访问http://localhost:8080/WebFlowDemo/user/loginSystem
11,输入任意登录信息,并按一下Login按钮,我直接按Login按钮 :)
12,输入daniel和123,并按一下Login按钮
Welcome, daniel
back to login page
13,点击"back to login page"链接,在点击login页面上的Register链接
This is a register page
back to login page
一个最简单的Spring Web Flow应用完成。
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