使用 "1 < 解析 thymeleaf 模板时出错0" [英] Error parsing thymeleaf template with "1 < 0"

问题描述

也许是一个愚蠢的问题，但我未能从谷歌检索信息.正如标题所说，如果尝试解析这个简单的行，我会得到一个堆栈跟踪:

Maybe is a stupid question but I failed to retrieve information from Google. As the title say, I get a stack trace if a try to parse this simple line:

<span th:if="${1 < 0}">

错误是:

org.xml.sax.SAXParseException;行号:14；列数:43；与元素类型null"关联的属性th:if"的值不得包含<"字符.

但是如果我试试这个:

<span th:if="${0 > 1}">

一切都很好，我的问题是:为什么我会收到这个错误?

Everything is fine, my question is: Why I get this error?

我相信这与我缺乏 Java 和 thymeleaf 的经验有关，但我不明白为什么只是改变它按我预期工作的元素的位置(返回始终为 false).

I believe is related to my lack of experience with Java and thymeleaf, but I don't get why by just changing the position of the elements it work as I expect (return always false).

这是表达式解析中的错误(因为某些解析器规则禁止检查 1 是否小于 0)或者只是一个奇怪的 XML 解析问题?

It is a bug in the parsing of the expression (as checking if 1 is lower than 0 is forbidden by some parser rule) or is just a weird XML parsing issue?

感谢所有刚刚阅读的人.

Thank you to all who will even just read.

推荐答案

必须使用

&lt; for < 
&gt; for >
&le; for <= 
&ge; for >=

所以你的代码应该是这样的:

So your code should look like :

<span th:if="${1 &lt; 0}">

您可以在他们的 网站，在比较器和相等部分.

You can find the whole doc about this in the 'Using Thymeleaf' tutorial on their website, in the comparators-and-equality section.

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