使用Spring授权标签检查用户是否登录时出错? [英] Error using Spring authorize tag to check to see if user is logged in?

问题描述

尝试测试用户是否已登录，我正在使用以下代码:

Trying to test to see if a user is logged in I am using the following code:

<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>

<sec:authorize access="isAuthenticated()">
   YES, you are logged in!
</sec:authorize>

但是我得到了以下错误提示?

But I am getting the following erorr?

javax.servlet.jsp.JspException: No visible WebSecurityExpressionHandler instance could be found in the application context. There must be at least one in order to support expressions in JSP 'authorize' tags.
        at org.springframework.security.taglibs.authz.AuthorizeTag.getExpressionHandler(AuthorizeTag.java:100)
        at org.springframework.security.taglibs.authz.AuthorizeTag.authorizeUsingAccessExpression(AuthorizeTag.java:58)
        at org.springframework.security.taglibs.authz.AuthorizeTag.doStartTag(AuthorizeTag.java:48)

推荐答案

要使用表达式保护单个URL，首先需要将元素中的use-expressions属性设置为true

To use expressions to secure individual URLs, you would first need to set the use-expressions attribute in the element to true

<http use-expressions="true"> 请参阅Spring Security文档

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