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>