freemark获取context方法(spring3.0)

<bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
		<property name="cache" value="true"/>
		<property name="prefix" value=""/>
		<property name="suffix" value=".ftl"/>
	    <property name="exposeRequestAttributes" value="true" />   
	    <property name="exposeSessionAttributes" value="true" />   
	    <property name="contentType" value="text/html; charset=utf-8"/>   
	    <property name="exposeSpringMacroHelpers" value="true"/>
</bean>	
	<bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
	  <property name="templateLoaderPath" value="/WEB-INF/ftl/"/>
	</bean>

设置ftl的目录/WEB-INF/ftl

新建文件taglibs.ftl内容

<#macro basePath><#if springMacroRequestContext.getContextPath()=="/"><#else>${springMacroRequestContext.getContextPath()}</#if></#macro>
<#global contextPath><@basePath/></#global>

这句就是精华

在你的ftl文件中引入

<#import "/spring.ftl" as spring />
<#include "/common/taglibs.ftl" />

注意： <#macro basePath> 这段判断了没有项目跟目录的情况， 例如只有个 / 这种场景，

只要在其它文件里 ${contextPath} 就可以获取根目录了。 跟重要的是taglibs.ftl里可以引入更多的 tag 例如struts tld 样式公用jquery.js等东西。

网上说了很多方式在ftl里用 ${request.conextPath} ${Request.conextPath} 之类的我试了都没有作用

我觉得应该用springMacroRequestContext来读取request的方法， 不是获取属性值哦。

除此之外还可以定义宏 用import的方式导入文件

另外我附上spring.ftl 希望可以对您理解在freemark里使用spring标签有所帮助

<#ftl strip_whitespace=true>
<#--
* spring.ftl
*
* This file consists of a collection of FreeMarker macros aimed at easing
* some of the common requirements of web applications - in particular
* handling of forms.
*
* Spring's FreeMarker support will automatically make this file and therefore
* all macros within it available to any application using Spring's
* FreeMarkerConfigurer.
*
* To take advantage of these macros, the "exposeSpringMacroHelpers" property
* of the FreeMarker class needs to be set to "true". This will expose a
* RequestContext under the name "springMacroRequestContext", as needed by
* the macros in this library.
*
* @author Darren Davison
* @author Juergen Hoeller
* @since 1.1
-->

<#--
* message
*
* Macro to translate a message code into a message.
-->
<#macro message code>${springMacroRequestContext.getMessage(code)}</#macro>

<#--
* messageText
*
* Macro to translate a message code into a message,
* using the given default text if no message found.
-->
<#macro messageText code, text>${springMacroRequestContext.getMessage(code, text)}</#macro>

<#--
* messageArgs
*
* Macro to translate a message code with arguments into a message.
-->
<#macro messageArgs code, args>${springMacroRequestContext.getMessage(code, args)}</#macro>

<#--
* messageArgsText
*
* Macro to translate a message code with arguments into a message,
* using the given default text if no message found.
-->
<#macro messageArgsText code, args, text>${springMacroRequestContext.getMessage(code, args, text)}</#macro>

<#--
* theme
*
* Macro to translate a theme message code into a message.
-->
<#macro theme code>${springMacroRequestContext.getThemeMessage(code)}</#macro>

<#--
* themeText
*
* Macro to translate a theme message code into a message,
* using the given default text if no message found.
-->
<#macro themeText code, text>${springMacroRequestContext.getThemeMessage(code, text)}</#macro>

<#--
* themeArgs
*
* Macro to translate a theme message code with arguments into a message.
-->
<#macro themeArgs code, args>${springMacroRequestContext.getThemeMessage(code, args)}</#macro>

<#--
* themeArgsText
*
* Macro to translate a theme message code with arguments into a message,
* using the given default text if no message found.
-->
<#macro themeArgsText code, args, text>${springMacroRequestContext.getThemeMessage(code, args, text)}</#macro>

<#--
* url
*
* Takes a relative URL and makes it absolute from the server root by
* adding the context root for the web application.
-->
<#macro url relativeUrl>${springMacroRequestContext.getContextUrl(relativeUrl)}</#macro>

<#--
* bind
*
* Exposes a BindStatus object for the given bind path, which can be
* a bean (e.g. "person") to get global errors, or a bean property
* (e.g. "person.name") to get field errors. Can be called multiple times
* within a form to bind to multiple command objects and/or field names.
*
* This macro will participate in the default HTML escape setting for the given
* RequestContext. This can be customized by calling "setDefaultHtmlEscape"
* on the "springMacroRequestContext" context variable, or via the
* "defaultHtmlEscape" context-param in web.xml (same as for the JSP bind tag).
* Also regards a "htmlEscape" variable in the namespace of this library.
*
* Producing no output, the following context variable will be available
* each time this macro is referenced (assuming you import this library in
* your templates with the namespace 'spring'):
*
* spring.status : a BindStatus instance holding the command object name,
* expression, value, and error messages and codes for the path supplied
*
* @param path : the path (string value) of the value required to bind to.
* Spring defaults to a command name of "command" but this can be overridden
* by user config.
-->
<#macro bind path>
<#if htmlEscape?exists>
<#assign status = springMacroRequestContext.getBindStatus(path, htmlEscape)>
<#else>
<#assign status = springMacroRequestContext.getBindStatus(path)>
</#if>
<#-- assign a temporary value, forcing a string representation for any
kind of variable. This temp value is only used in this macro lib -->
<#if status.value?exists && status.value?is_boolean>
<#assign stringStatusValue=status.value?string>
<#else>
<#assign stringStatusValue=status.value?default("")>
</#if>
</#macro>

<#--
* bindEscaped
*
* Similar to spring:bind, but takes an explicit HTML escape flag rather
* than relying on the default HTML escape setting.
-->
<#macro bindEscaped path, htmlEscape>
<#assign status = springMacroRequestContext.getBindStatus(path, htmlEscape)>
<#-- assign a temporary value, forcing a string representation for any
kind of variable. This temp value is only used in this macro lib -->
<#if status.value?exists && status.value?is_boolean>
<#assign stringStatusValue=status.value?string>
<#else>
<#assign stringStatusValue=status.value?default("")>
</#if>
</#macro>

<#--
* formInput
*
* Display a form input field of type 'text' and bind it to an attribute
* of a command or bean.
*
* @param path the name of the field to bind to
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formInput path attributes="" fieldType="text">
<@bind path/>
<input type="${fieldType}" id="${status.expression}" name="${status.expression}" value="<#if fieldType!="password">${stringStatusValue}</#if>" ${attributes}<@closeTag/>
</#macro>

<#--
* formPasswordInput
*
* Display a form input field of type 'password' and bind it to an attribute
* of a command or bean. No value will ever be displayed. This functionality
* can also be obtained by calling the formInput macro with a 'type' parameter
* of 'password'.
*
* @param path the name of the field to bind to
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formPasswordInput path attributes="">
<@formInput path, attributes, "password"/>
</#macro>

<#--
* formHiddenInput
*
* Generate a form input field of type 'hidden' and bind it to an attribute
* of a command or bean. This functionality can also be obtained by calling
* the formInput macro with a 'type' parameter of 'hidden'.
*
* @param path the name of the field to bind to
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formHiddenInput path attributes="">
<@formInput path, attributes, "hidden"/>
</#macro>

<#--
* formTextarea
*
* Display a text area and bind it to an attribute of a command or bean.
*
* @param path the name of the field to bind to
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formTextarea path attributes="">
<@bind path/>
<textarea id="${status.expression}" name="${status.expression}" ${attributes}>${stringStatusValue}</textarea>
</#macro>

<#--
* formSingleSelect
*
* Show a selectbox (dropdown) input element allowing a single value to be chosen
* from a list of options.
*
* @param path the name of the field to bind to
* @param options a map (value=label) of all the available options
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formSingleSelect path options attributes="">
<@bind path/>
<select id="${status.expression}" name="${status.expression}" ${attributes}>
<#if options?is_hash>
<#list options?keys as value>
<option value="${value?html}"<@checkSelected value/>>${options[value]?html}</option>
</#list>
<#else>
<#list options as value>
<option value="${value?html}"<@checkSelected value/>>${value?html}</option>
</#list>
</#if>
</select>
</#macro>

<#--
* formMultiSelect
*
* Show a listbox of options allowing the user to make 0 or more choices from
* the list of options.
*
* @param path the name of the field to bind to
* @param options a map (value=label) of all the available options
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formMultiSelect path options attributes="">
<@bind path/>
<select multiple="multiple" id="${status.expression}" name="${status.expression}" ${attributes}>
<#list options?keys as value>
<#assign isSelected = contains(status.value?default([""]), value)>
<option value="${value?html}"<#if isSelected> selected="selected"</#if>>${options[value]?html}</option>
</#list>
</select>
</#macro>

<#--
* formRadioButtons
*
* Show radio buttons.
*
* @param path the name of the field to bind to
* @param options a map (value=label) of all the available options
* @param separator the html tag or other character list that should be used to
* separate each option. Typically '&nbsp;' or '<br>'
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formRadioButtons path options separator attributes="">
<@bind path/>
<#list options?keys as value>
<#assign id="${status.expression}${value_index}">
<input type="radio" id="${id}" name="${status.expression}" value="${value?html}"<#if stringStatusValue == value> checked="checked"</#if> ${attributes}<@closeTag/>
<label for="${id}">${options[value]?html}</label>${separator}
</#list>
</#macro>

<#--
* formCheckboxes
*
* Show checkboxes.
*
* @param path the name of the field to bind to
* @param options a map (value=label) of all the available options
* @param separator the html tag or other character list that should be used to
* separate each option. Typically '&nbsp;' or '<br>'
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formCheckboxes path options separator attributes="">
<@bind path/>
<#list options?keys as value>
<#assign id="${status.expression}${value_index}">
<#assign isSelected = contains(status.value?default([""]), value)>
<input type="checkbox" id="${id}" name="${status.expression}" value="${value?html}"<#if isSelected> checked="checked"</#if> ${attributes}<@closeTag/>
<label for="${id}">${options[value]?html}</label>${separator}
</#list>
<input type="hidden" name="_${status.expression}" value="on"/>
</#macro>

<#--
* formCheckbox
*
* Show a single checkbox.
*
* @param path the name of the field to bind to
* @param attributes any additional attributes for the element (such as class
* or CSS styles or size
-->
<#macro formCheckbox path attributes="">
<@bind path />
<#assign id="${status.expression}">
<#assign isSelected = status.value?? && status.value?string=="true">
<input type="hidden" name="_${id}" value="on"/>
<input type="checkbox" id="${id}" name="${id}"<#if isSelected> checked="checked"</#if> ${attributes}/>
</#macro>

<#--
* showErrors
*
* Show validation errors for the currently bound field, with
* optional style attributes.
*
* @param separator the html tag or other character list that should be used to
* separate each option. Typically '<br>'.
* @param classOrStyle either the name of a CSS class element (which is defined in
* the template or an external CSS file) or an inline style. If the value passed in here
* contains a colon (:) then a 'style=' attribute will be used, else a 'class=' attribute
* will be used.
-->
<#macro showErrors separator classOrStyle="">
<#list status.errorMessages as error>
<#if classOrStyle == "">
<b>${error}</b>
<#else>
<#if classOrStyle?index_of(":") == -1><#assign attr="class"><#else><#assign attr="style"></#if>
<span ${attr}="${classOrStyle}">${error}</span>
</#if>
<#if error_has_next>${separator}</#if>
</#list>
</#macro>

<#--
* checkSelected
*
* Check a value in a list to see if it is the currently selected value.
* If so, add the 'selected="selected"' text to the output.
* Handles values of numeric and string types.
* This function is used internally but can be accessed by user code if required.
*
* @param value the current value in a list iteration
-->
<#macro checkSelected value>
<#if stringStatusValue?is_number && stringStatusValue == value?number>selected="selected"</#if>
<#if stringStatusValue?is_string && stringStatusValue == value>selected="selected"</#if>
</#macro>

<#--
* contains
*
* Macro to return true if the list contains the scalar, false if not.
* Surprisingly not a FreeMarker builtin.
* This function is used internally but can be accessed by user code if required.
*
* @param list the list to search for the item
* @param item the item to search for in the list
* @return true if item is found in the list, false otherwise
-->
<#function contains list item>
<#list list as nextInList>
<#if nextInList == item><#return true></#if>
</#list>
<#return false>
</#function>

<#--
* closeTag
*
* Simple macro to close an HTML tag that has no body with '>' or '/>',
* depending on the value of a 'xhtmlCompliant' variable in the namespace
* of this library.
-->
<#macro closeTag>
<#if xhtmlCompliant?exists && xhtmlCompliant>/><#else>></#if>
</#macro>