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[Java教程][javaEE] jsp的指令


jsp的指令:jsp的指令(directive)是为jsp引擎而设计的,他们并不直接产生任何可见输出,而是告诉引擎如何处理jsp

页面中的其他部分

 

页面头部的page指令

<%@page import="org.apache.jasper.tagplugins.jstl.core.Out"%>

<%@page import="java.util.Date"%>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

 

配置错误页面:

<%@ page errorPage="500.jsp"%>

web.

  <error-page>

   <error-code>500</error-code>

   <location>/500.jsp</location>

  </error-page>

  <error-page>

   <error-code>404</error-code>

   <location>/404.jsp</location>

  </error-page>

 

解决中文乱码:

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

 

页面包含:

<%@include file="footer.jsp" %>

 

jsp的九大隐式对象:

jsp页面翻译成Servlet后,在service方法中,自动为我们定义出来的九个对象

page对象,当前Servlet对象

config

application

response

request

session

out

pageContext

final javax.servlet.jsp.PageContext pageContext;

    javax.servlet.http.HttpSession session = null;

    final javax.servlet.ServletContext application;

    final javax.servlet.ServletConfig config;

    javax.servlet.jsp.JspWriter out = null;

    final java.lang.Object page = this;

    javax.servlet.jsp.JspWriter _jspx_out = null;

    javax.servlet.jsp.PageContext _jspx_page_context = null;