JSP EL表达式 param、paramValues的使用

时间：2023-03-09 17:59:10
JSP EL表达式 param、paramValues的使用

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>

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