Question

我正试图更多地了解联合调查小组的表述评价。如何确定哪些变数可以用于表达方式的获取?

我有一个简单的共同财产计划(平等者是一个方便的总结)。

<% String foo = "bar"; %>
<%= ELEvaluator.evaluate("${foo}", request, pageContext) %> //-> blank
<%= ELEvaluator.evaluate("${1 + 1}", request, pageContext %> // -> 2

这些var/objs是否需要在请求中存在? 或者在Context/Evaluator上登记?

Thanks

Answer 1

。手段

find a page-scope attribute named "foo" and, if not found
find a request-scope attribute named "foo" and, if not found
find a session-scope attribute named "foo" and, if not found
find an application-scope attribute named "foo"

因此,如果你想要向EL提供某种反对,则将其储存在适当的范围内:

pageContext.setAttribute("foo", theObject);
// or
request.setAttribute("foo", theObject);
// or
session.setAttribute("foo", theObject);
// or
servletContext.setAttribute("foo", theObject);

友情链接