There is no Action mapped for namespace [/students] and action name [Students_queryAll] associated with context path [/xiaotao].
这样写
<action name="*_*" class="action.{1}Action" method="{2}">
不能找到action的位置,然后写全名
<action name="*_*" class="action.StudentsAction" method="queryAll">就能找到呢