22

仅当用户通过身份验证时,我无法在 JSP 页面中显示注销链接。这是我在 JSP 页面的这一行遇到的异常:

<sec:authorize access="isAuthenticated()">

例外:

Stacktrace:
....

root cause

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.
    org.springframework.security.taglibs.authz.AuthorizeTag.getExpressionHandler(AuthorizeTag.java:100)
    org.springframework.security.taglibs.authz.AuthorizeTag.authorizeUsingAccessExpression(AuthorizeTag.java:58)

这是我的应用程序上下文Security.xml:

<http auto-config='true' >
    <intercept-url pattern="/user/**" access="ROLE_User" />
    <logout logout-success-url="/hello.htm" />
</http>

<beans:bean id="daoAuthenticationProvider"
    class="org.springframework.security.authentication.dao.DaoAuthenticationProvider">
    <beans:property name="userDetailsService" ref="userDetailsService" />
</beans:bean>

<beans:bean id="authenticationManager"
    class="org.springframework.security.authentication.ProviderManager">
    <beans:property name="providers">
        <beans:list>
            <beans:ref local="daoAuthenticationProvider" />
        </beans:list>
    </beans:property>
</beans:bean>

<authentication-manager>
    <authentication-provider user-service-ref="userDetailsService">
        <password-encoder hash="plaintext" />
    </authentication-provider>
</authentication-manager>

我知道我可以在 http 标记中使用 use-expression="true" ,但这意味着我必须在拦截 url 标记和 java 代码中使用表达式。有解决方法吗?

4

1 回答 1

46

您只需将一个添加到您的应用程序上下文中

<bean id="webexpressionHandler" class="org.springframework.security.web.access.expression.DefaultWebSecurityExpressionHandler" /> 

但最简单的方法是在您的<http>配置中启用表达式,然后会为您添加一个。这仅意味着您必须在该块中使用表达式,而不是在 Java 代码中,例如方法@Secured注释。

于 2012-07-21T18:53:43.800 回答