Java 如何在 JSTL/JSP 中的循环中连接字符串？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2542436/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How can I concatenate a string within a loop in JSTL/JSP?
提问by qodeninja
<c:forEach items="${myParams.items}" var="currentItem" varStatus="stat">
<c:set var="myVar" value="<c:out var="myVar" />" />
</c:forEach>
I want to concatenate the values of currentItem.myVar and output it at the end of the loop, problem is I can't figure out how to do this...
我想连接 currentItem.myVar 的值并在循环结束时输出它，问题是我不知道如何做到这一点......
(Preferably not using Java)
（最好不要使用Java）
采纳答案by harto
Perhaps this will work?
也许这会奏效？
<c:forEach items="${myParams.items}" var="currentItem" varStatus="stat">
<c:set var="myVar" value="${stat.first ? '' : myVar} ${currentItem}" />
</c:forEach>
回答by Kapil D
define a String variable using the JSP tags
使用 JSP 标签定义一个 String 变量
<%!
String test = new String();
%>
then refer to that variable in your loop as
然后在循环中将该变量称为
<c:forEach items="${myParams.items}" var="currentItem" varStatus="stat">
test+= whaterver_value
</c:forEach>
回答by Ben J
You're using JSTL 2.0 right? You don't need to put <c:out/>around all variables. Have you tried something like this?
您使用的是 JSTL 2.0 对吗？你不需要把<c:out/>所有的变量都放在一边。你有没有尝试过这样的事情？
<c:forEach items="${myParams.items}" var="currentItem" varStatus="stat">
<c:set var="myVar" value="${myVar}${currentItem}" />
</c:forEach>
Edit: Beaten by the above
编辑：被上述击败
回答by Niklas Peter
Is JSTL's join(), what you searched for?
是 JSTL 的join()，您搜索的是什么？
<c:set var="myVar" value="${fn:join(myParams.items, ' ')}" />
