如题，使用freemarker作为模板引擎，当我们的变量类型为boolean时，如果通过freemarker页面直接输出，会报错。

Can't convert boolean to string automatically, because the "boolean_format" setting was "true,false", which is the legacy default computer-language format, and hence isn't accepted.

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Tip: If you just want "true"/"false" result as you are generting computer-language output, use "?c", like ${myBool?c}.
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Tip: You can write myBool?string('yes', 'no') and like to specify boolean formatting in place.
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Tip: If you need the same two values on most places, the programmers should set the "boolean_format" setting to something like "yes,no".
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解决办法在提示里面，我们需要对boolean类型做一个转换：${status?string("ok","error")}

转换之后，页面显示就正常了，不会报错：

string("ok","error")，这里可以随便替换，就是需要两个参数，可以根据实际需要，当然，写成string("true","false")也是可以的。