在Freemarker中，`name`作为变量名会中断 [英] `name` as a variable name in freemarker breaks

问题描述

我在ftl中有以下代码:

I have the following code in an ftl:

<#macro field label name value="" type="text">
    ${name}
    ${name!"print if null"}
    <div class="field">
        <div class="clearfix" id="${name}_field">
            <label for="${name}">${label}</label>
            <div class="input">
            <input type="${type}" id="${name}" name="${name}" value="${value}">
                <span class="help-inline"></span>
                <span class="help-block"></span> 
            </div>
        </div>
    </div>
</#macro>


<@field label="label" name="test" />

这是打印此内容:

foo-test
test
<div class="field">
    <div class="clearfix" id="foo-test_field">
        <label for="foo-test">label</label>
        <div class="input">
        <input type="text" id="foo-test" name="foo-test" value="">
            <span class="help-inline"></span>
            <span class="help-block"></span> 
        </div>
    </div>
</div>

foo-test是我的应用程序的名称，但无法理解为什么将其打印在其中..只是使用ctrl + f搜索foo-test，并且在ftl或控制器中均无处...

foo-test is the name of my app but can't understand why is it being printed there.. Just used ctrl+f to search for foo-test and it is nowhere in the ftl or the controller...

除此以外，让我们假设name是一个具有我的应用程序名称的变量.那么，为什么第二张打印仅打印我传递给宏的正确值?这真的很奇怪...

Besides this, let's suppose that name is a variable that has the name of my app.. Then why the second print just prints the right value that i passed to my macro?? This is really strange...

我使用Maven和spark，所以我有这种依赖性:

I use Maven and spark so I have this dependency:

    <dependency>
        <groupId>com.sparkjava</groupId>
        <artifactId>spark-template-freemarker</artifactId>
        <version>2.0.0</version>
    </dependency>

插件是这样的:

<build>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources> 
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.1</version>
            <configuration>
                <mainClass>com.example.foo.foo-test</mainClass>
            </configuration>
        </plugin>
    </plugins>
</build>

我的控制器如下所示:

    .....

    import spark.ModelAndView;
    import spark.Spark;
    import spark.template.freemarker.FreeMarkerEngine;

    ......

    Spark.get("/foo", (request, response) -> {
        Map<String, Object> attributes = new HashMap<>();
        return new ModelAndView(attributes, "test.ftl");
    }, new FreeMarkerEngine());

推荐答案

之所以会发生这种情况，是因为您已经配置了maven来过滤您的资源，它确实用项目名称替换了${name}占位符.

This is happening because you have configured maven to filter your resources, which it does substituting ${name} placeholder with the name of your project.

从pom中删除<resources>，或者如果您确实需要资源过滤，则可以排除ftl-s文件.

Remove <resources> from your pom or if you do need resource filtering you can exclude ftl-s files.

<resources>
    <resource>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
    </resource>
</resources>

关于资源过滤maven-resources-plugin文档>使用${name}占位符精确演示了此行为. :)

BTW the maven-resources-plugin documentation about resource filtering demonstrates exact this behaviour with the ${name} placeholder. :)

这篇关于在Freemarker中，`name`作为变量名会中断的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！