JSP EL表达式 param、paramValues的使用：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";pageContext.setAttribute("pca", "pageContextAttribute");//session.setAttribute("s", "session");%><!DOCTYPE html><html><head><meta charset="UTF-8"><title>008index</title></head><body><form action="index018.jsp" method="post" ><input type="text" name = "name" value="inputName"><input type="text" name = "age" value="28"><input type="text" name = "food" value="apple"><input type="text" name = "food" value="orange"><input type="submit" value="submit" ></form></body></html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";pageContext.setAttribute("pca", "pageContextAttribute");//session.setAttribute("s", "session");%><!DOCTYPE html><html><head><meta charset="UTF-8"><title>008index</title></head><body><p>param.name is : ${param.name }</p><p>param.age is : ${param.age }</p><p>param.food is : ${param.food }</p><p>paramValues.food is : ${paramValues.food }</p><p>paramValues.food[0] is : ${paramValues.food[0] }</p><p>paramValues.food[1] is : ${paramValues.food[1] }</p><p>使用paramValues得到的就是数组，即使提交的是单个信息也会得到数组</p><p>paramValues.name is : ${paramValues.name }</p><p>paramValues.name[0] is : ${paramValues.name[0] }</p><p>直接访问页面的header.Referer为空，其他页面提交过来的不为空</p><p>header.Referer is : ${header.Referer }</p><p>header["Referer"] is : ${header["Referer"] }</p><p>header["Content-Type"] is : ${header["Content-Type"] }</p></body></html>
