将 jsp 文件中的变量传递给标签

Pass variable from a jsp file to a tag

我正在使用标签将我的应用程序主体插入到应用程序的全局布局中。我正在尝试将 .jsp 文件中声明的新 css/js 文件(特定于应用程序)插入到标签中(不确定我是否清楚,但代码应该对此进行说明)

这是我的 wrapper.tag 文件(有点简化):

<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@tag description="Wrapper Tag" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <title>Title of the page</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="robots" content="noindex,nofollow" />

    <!-- Bootstrap -->
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

    <!-- Custom styles -->
    <spring:url value="/resources/core/css/style.css" var="coreCss" />
    <link href="${coreCss}" rel="stylesheet" />

    <!-- jQuery -->
    <script src="https://code.jquery.com/jquery-3.2.1.min.js" crossorigin="anonymous"></script>
    <!-- Bootstrap -->
    <!-- Latest compiled and minified JavaScript -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

    <!-- Custom scripts -->
    <spring:url value="/resources/core/js/script.js" var="coreJs" />
    <script src="${coreJs}"></script>
</head>
<body>
    <div class="content">
        <div class="app-content">
            <jsp:doBody/>
        </div>
    </div>
</body>
</html>

下面是一个使用该标签的 jsp 文件示例:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="t" tagdir="/WEB-INF/tags" %>

<t:wrapper>
    <div class="container">
        <form class="form-signin">
            <h2 class="form-signin-heading">Please sign in</h2>
            <label for="inputEmail" class="sr-only">Email address</label>
            <input type="email" id="inputEmail" class="form-control" placeholder="Email address" required autofocus>

            <label for="inputPassword" class="sr-only">Password</label>
            <input type="password" id="inputPassword" class="form-control" placeholder="Password" required>

            <div class="checkbox">
                <label>
                    <input type="checkbox" value="remember-me"> Remember me
                </label>
            </div>

            <button class="btn btn-lg btn-primary btn-block" type="submit">Sign in</button>
        </form>
    </div>
</t:wrapper>

我想在 jsp 文件中声明变量以插入新的 css/js 文件以在包装器标记的 <head> 中加载。

我找到了方法,下面是实现方法。

只需在 jsp 文件中的标记调用中传递一个属性:

<spring:url value="/resources/user/css/login.css" var="loginCss" />

<t:wrapper css="${loginCss}">

并在wrapper标签的<head>中添加:

<%@ attribute name="css" %>
<c:if test="${!empty css}" >
    <link href="${css}" rel="stylesheet" />
</c:if>

JS 也一样。