FreeMarker检查对象的类名 [英] FreeMarker check the class name of an object

问题描述

有没有办法在freemarker模板中获取对象的类名?

is there a way to get the class name of an object in a freemarker template ?

例如:

<#if component.javaType.class.name.equals("test")  > 
 "something...."
</#else>
 "something else ...."
</#if>

谢谢

推荐答案

没有为此内置的功能，但是根据配置设置和对象的类型，这可能有效:

There's no feature built in for that, but depending on the configuration settings and on the type of the object, this may works:

<#if component.class.name == 'com.example.Something'>

之所以有用，是因为component.foo在Java中仅表示comonent.getFoo()，因此以上仅表示component.getClass().getName().但是，如果未公开component的JavaBean属性，这是行不通的(假设使用常规的FreeMarker配置)，String -s，Number -s，Map -s就是这种情况， List -s和其他一些标准"类.如果component可以是这样的对象，但是无论如何它们的比较都应该为假，则可以编写(component.class.name)!'unknown' == 'com.example.Something'.

That works because component.foo simply means comonent.getFoo() in Java, so the above just means component.getClass().getName(). This, however doesn't work if the JavaBean properties of component aren't exposed, which (assuming the usual FreeMarker configuration) is the case for String-s, Number-s, Map-s, List-s and some more "standard" classes. If component can be a such object, but the comparison should be false for them anyway, you can write (component.class.name)!'unknown' == 'com.example.Something'.

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