Java freemarker 中的字符串比较不起作用
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String comparison in freemarker not working
提问by user3582550
<#if ${primaryName!}?has_content> && ${key?js_string!}=="Joe">
//do something
<#elseif ${primaryClass!}?has_content> && ${key?js_string!}=="Apple">
//do something
<#else>
//do something
</#if>
The above gives me error that something is expected at the end. { ] && . Whats wrong in the above?
以上给了我一个错误，即最终会发生一些事情。{ ] && 。以上有什么问题吗？
Encountered "{" at line 26, column 39 in abc.ftl. Was expecting one of: ">" ... "." ... "[" ... "(" ... "?" ... "!" ... <TERMINATING_EXCLAM> ... "??" ... "+" ... "-" ... "*" ... "/" ... "%" ... "!=" ... "=" ... "==" ... ">=" ... <ESCAPED_GTE> ... ">" ... <ESCAPED_GT> ... <LESS_THAN_EQUALS> ... <LESS_THAN> ... ".." ... <AND> ... <OR> ...
采纳答案by Asif Bhutto
Yes, Absolutely it will give you some thing like this
是的，绝对会给你这样的东西
Encountered "{" ...
Was expecting one of:
">" ...
"." ...
"[" ...
"(" ...
"?" ...
"!" ...
Because if else syntax is not correct, there are couple of things wrong.
因为如果 else 语法不正确，则有几件事是错误的。
Highlighted are are wrong thing in below line.
突出显示的是以下行中的错误内容。
<#if ${primaryName!}?has_content>&& ${key?js_string!}=="Joe">
<#if ${primaryName !}?has_content >&& ${key?js_string!}=="Joe">
you put the data in data model but in template for if/else foreach, list you can access it direct not with the ${}
您将数据放在数据模型中，但放在 if/else foreach 的模板中，列出您可以直接访问它，而不是使用 ${}
Here is correct , for equality use ==for uneqality use !=
这是正确的，对于不平等使用==的平等使用!=
<#if primaryName?has_content && key?is_string && key=="Joe">
// do somthing
<#elseif primaryClass?has_content && key?is_string && key=="Apple">
// elseif do something
<#else>
// else do something
</#if>
has_contentreturn true. see doc
has_content返回真。看文档
Note that when your data-model implements multiple template model interfaces you may get unexpected results. However, when in doubt you can use always use expr!?size > 0 or expr!?length > 0 instead of expr?has_content.
There is no js_string method , but its is is_string return true, if value is string
see doc for is_string
有关is_string 的信息，请参阅文档
Further see matchesBuilt-ins for strings
进一步参见 matches字符串的内置函数
