jsp 内置对象

JSP对象在SERVLET中

//jsp七大隐示对象
  JspFactory _jspxFactory = null;
  PageContext pageContext = null; //pageContext对象
  HttpSession session = null;
  ServletContext application = null;
  ServletConfig config = null;
  JspWriter out = null;
  Object page = this; //page对象

1 pageContext对象

<%pageContext.getOut().print("1111111"); %>

JSP页面输出

<c:set var="ctx" value="${pageContext.request.contextPath}"/>

项目根目录

pageContext.setAttribute("str", attr, pageContext.APPLICATION_SCOPE);

String attr1 = (String) pageContext.getAttribute("str", pageContext.APPLICATION_SCOPE);

2 page对象和request区别
一个request可以包含多个page页(include,forward以及filter).

引用

page对应jsp生成的servlet类的this引用