EL

EL

EL的取值方法

1.${param.name} = ${param["name"]}

2.${pageScope.name} = ${pageScope["name"]}

3.${requestScope.name} = ${requestScope["name"]}

4.${sessionScope.name} = ${sessionScope["name"]}

5.${applicationScope.name} = ${applicationScope["name"]}

注：虽然两种方式的效果一样，但是后者可以实现动态取值，若data="name" 则 → ${pageScope[data]}

EL的取值顺序

page → request → session → application 没有就返回null