freemarker在grails中的隐藏变量

1.假设你用以下地址访问系统：

http://www.abc.com/html/aboutLaw?name=cat&age=20

 

很明显是渲染了aboutLaw.ftl这个页面。如果要在aboutLaw.ftl中直接使用传来的参数name和age，要怎么用呢？

很简单，用以下变量：

 

 

<#list RequestParameters?keys as x>                    	
                        ${x}<br/>
                    	${RequestParameters[x]}<br/>
                    	---------------------<br/>
  </#list>

 

其实就是用到了RequestParameters。在上例中，可以用${RequestParameters['name']}直接得到传过来的参数值。

 

 

2.还有一个变量：Request

 

<#list Request?keys as x>
                    	key:${x}<br/>
                    	value:${Request[x]}<br/>
                    	--------------------- <br/>
    </#list>

 

我的controller如下：

 

package controller
import java.util.HashSet;
import net.sf.json.JSONArray
import javax.servlet.RequestDispatcher
import java.lang.Thread
import model.*
import javax.servlet.ServletResponse
import org.springframework.web.servlet.ModelAndView
class HtmlController  extends BaseController {
	def gotoHtml={
		render(view:"${params.page}")
	}
	def aboutLaw={
			
	}
	def aboutYuanli={
			
	}
	def aboutFee={
			
	}
	def aboutUs={
			
	}
	def help={
			
	}
	
}

 访问地址为：

 

http://www.abc.com/html/aboutLaw

 

 

打印出的信息如下：

 

key:javax.servlet.forward.request_uri
value:/html/aboutLaw
--------------------- 
key:javax.servlet.forward.context_path
value:
--------------------- 
key:javax.servlet.forward.servlet_path
value:/html/aboutLaw
--------------------- 
key:aboutFee
value:controller.HtmlController$_closure4@3b889b
--------------------- 
key:manager
value:manager.Manager@793ec9
--------------------- 
key:org.springframework.web.servlet.DispatcherServlet.THEME_SOURCE
value:org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext@1f39cb2: startup date [Tue Nov 08 09:21:17 CST 2011]; parent: Root WebApplicationContext
--------------------- 
key:org.springframework.web.servlet.DispatcherServlet.THEME_RESOLVER
value:org.springframework.web.servlet.theme.FixedThemeResolver@5e67f1
--------------------- 
key:springMacroRequestContext
value:org.springframework.web.servlet.support.RequestContext@857f69
--------------------- 
key:metaClass
value:groovy.lang.ExpandoMetaClass@359912[class controller.HtmlController]
--------------------- 
key:aboutUs
value:controller.HtmlController$_closure5@6ffb14
--------------------- 
key:help
value:controller.HtmlController$_closure6@1cd022c
--------------------- 
key:org.codehaus.groovy.grails.GRAILS_APPLICATION_ATTRIBUTES
value:org.codehaus.groovy.grails.web.servlet.DefaultGrailsApplicationAttributes@49c8dd
--------------------- 
key:urlMapping.FILTERED
value:
--------------------- 
key:charEncodingFilter.FILTERED
value:
--------------------- 
key:ctx
value:org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext@1f39cb2: startup date [Tue Nov 08 09:21:17 CST 2011]; parent: Root WebApplicationContext
--------------------- 
key:org.codehaus.groovy.grails.CONTROLLER_NAME_ATTRIBUTE
value:html
--------------------- 
key:grailsApp
value:org.codehaus.groovy.grails.commons.DefaultGrailsApplication@11aed03
--------------------- 
key:org.codehaus.groovy.grails.CONTROLLER
value:controller.HtmlController@22537a
--------------------- 
key:hiddenHttpMethod.FILTERED
value:
--------------------- 
key:grailsWebRequest.FILTERED
value:
--------------------- 
key:org.springframework.web.servlet.DispatcherServlet.CONTEXT
value:org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext@1f39cb2: startup date [Tue Nov 08 09:21:17 CST 2011]; parent: Root WebApplicationContext
--------------------- 
key:aboutLaw
value:controller.HtmlController$_closure2@1968017
--------------------- 
key:aboutYuanli
value:controller.HtmlController$_closure3@1b3a564
--------------------- 
key:class
value:class controller.HtmlController
--------------------- 
key:org.codehaus.grails.INCLUDED_JS_LIBRARIES
value:
--------------------- 
key:gotoHtml
value:controller.HtmlController$_closure1@12f7431
--------------------- 
key:getPage
value:controller.BaseController$_closure1@753f9f
--------------------- 
key:org.codehaus.groovy.grails.ACTION_NAME_ATTRIBUTE
value:aboutLaw
--------------------- 
key:org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.GSP_SITEMESH_PAGE
value:org.codehaus.groovy.grails.web.sitemesh.GSPSitemeshPage@1a41860
--------------------- 
key:reloadFilter.FILTERED
value:
--------------------- 
key:com.opensymphony.sitemesh.APPLIED_ONCE
value:
--------------------- 
key:sysParaService
value:service.SysParaService@6231ed
--------------------- 
key:day
value:86400
--------------------- 
key:org.codehaus.groovy.grails.WEB_REQUEST
value:ServletWebRequest: uri=/grails/html/aboutLaw.dispatch;client=127.0.0.1;session=D0849CBBEA6B59B4B7A0653BBF363064
--------------------- 
key:org.springframework.web.servlet.DispatcherServlet.LOCALE_RESOLVER
value:org.springframework.web.servlet.i18n.SessionLocaleResolver@44899b

 其中的javax.servlet.forward.request_uri很有用。

在freemarker中取得当前url ,就可以用以下语句

${Request['javax.servlet.forward.request_uri']}