jsp_EL_按域取值

1.获取地址栏参数:${param.id}

依序从Page、Request、Session、Application范围查找

Page PageScope

Request requestScope

Session sessionScope

Application applicationScope

2.获取request域参数:${requestScope.id}

3.获取session域参数:${sessionScope.id}

4.获取servletContext域参数:${applicationScope.id}