Can't convert boolean to string automatically, because the "boolean_format" setting was "true,false"

冷不防 2022-03-02 15:52 97阅读 0赞

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.
    
    ----
    Tip: If you just want "true"/"false" result as you are generting computer-language output, use "?c", like ${myBool?c}.
    ----
    Tip: You can write myBool?string('yes', 'no') and like to specify boolean formatting in place.
    ----
    Tip: If you need the same two values on most places, the programmers should set the "boolean_format" setting to something like "yes,no".
    ----

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")\}

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70][]

转换之后，页面显示就正常了，不会报错：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 1][]

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。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 1]: /images/20220302/6441870a28514cc6b980f210188a1a84.png