如何从 Freemarker TemplateDirectiveModel 访问 Spring RequestContext

发布于 2024-11-10 07:56:59 字数 675 浏览 1 评论 0原文

我使用 Spring MVC 和 Freemarker 作为视图技术。我有一个 TemplateDirectiveModel 对象，需要在执行方法中访问 Spring 的 RequestContext 。目前我是这样做的：

public class MyDirective implements TemplateDirectiveModel
{
    public void execute(Environment env, Map params, TemplateModel[] loopVars,
        TemplateDirectiveBody body) throws TemplateException, IOException
    {
        StringModel model = (StringModel) env.getGlobalVariable("springMacroRequestContext");
        RequestContext requestContext = (RequestContext) model.getWrappedObject();
    }
}

但我不敢相信这是正确的方法。我有一种感觉，我错过了一些重要的事情。也许 Spring 中有处理 Freemarker 指令的特殊类和注释？也许我可以让 Spring 将一些东西注入到指令类中，通过它我可以访问 Spring 请求范围？

原文

I'm using Spring MVC with Freemarker as view technologie. I have a TemplateDirectiveModel object which needs to access Spring's RequestContext within the execute method. Currently I do it like this:

public class MyDirective implements TemplateDirectiveModel
{
    public void execute(Environment env, Map params, TemplateModel[] loopVars,
        TemplateDirectiveBody body) throws TemplateException, IOException
    {
        StringModel model = (StringModel) env.getGlobalVariable("springMacroRequestContext");
        RequestContext requestContext = (RequestContext) model.getWrappedObject();
    }
}

But I can't believe that this is the right way to do it. I have the feeling I missed something important. Maybe there are special classes and annotations for handling Freemarker direcives in Spring? Maybe I can let Spring inject something into the directive class with which I can access Springs request scope?

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终陌 2024-11-17 07:56:59

您可以子类化FreeMarkerConfigurer，重写其postProcessConfiguration(Configuration config)方法。
您的实现只需在配置中添加一个请求感知依赖项，作为共享变量示例（由 FM文档）。

应该可以解决这个问题，Spring风格......

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阳光下的泡沫是彩色的 2024-11-17 07:56:59

有一种更简单的方法可以做到这一点。如果您已经在使用 spring 的 FreeMarkerConfigurer，则可以向其提供变量映射：

<bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer" 
p:templateLoaderPath="/some_path_here">
    <property name="freemarkerVariables">
        <map>
            <entry key='macroName' value-ref="templateModelRef" />
        </map>  
    </property>
</bean>

<bean id="templateModelRef" class="...class..extends TemplateModel">
    <property name="someResource" value-ref="resourceRef"/>
</bean>

现在至少在扩展 TemplateDirectiveModel 的执行方法的类中，您可以访问该注入的属性。

public class MyDirective extends TemplateDirectiveModel {
    private MyResource someResource;
    @Override
    public void execute(Environment env, Map params, TemplateModel[] loopVars,TemplateDirectiveBody body) throws TemplateException, IOException {

        StringModel sharedVariable = (StringModel)env.getConfiguration().getSharedVariable("beanName");
        MyClass sweetness = (MyClass)sharedVariable.getWrappedObject();
    }       
}

现在在您的 .ftl 中您可以使用：

<@macroName />;

并且它将自动注入 spring 依赖项。

There is an easier way to do this. If you are already using spring's FreeMarkerConfigurer, you can hand it a map of variables:

<bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer" 
p:templateLoaderPath="/some_path_here">
    <property name="freemarkerVariables">
        <map>
            <entry key='macroName' value-ref="templateModelRef" />
        </map>  
    </property>
</bean>

<bean id="templateModelRef" class="...class..extends TemplateModel">
    <property name="someResource" value-ref="resourceRef"/>
</bean>

Now at least in a class that extends TemplateDirectiveModel's execute method you have access to that injected property.

public class MyDirective extends TemplateDirectiveModel {
    private MyResource someResource;
    @Override
    public void execute(Environment env, Map params, TemplateModel[] loopVars,TemplateDirectiveBody body) throws TemplateException, IOException {

        StringModel sharedVariable = (StringModel)env.getConfiguration().getSharedVariable("beanName");
        MyClass sweetness = (MyClass)sharedVariable.getWrappedObject();
    }       
}

Now in your .ftl you can use:

<@macroName />

and it will have spring dependencies auto injected.

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