Spring Security-在应用程序上下文中找不到可见的WebSecurity ExpressionHandler实例

Question

只有当用户经过身份验证时，我才能在JSP页面中显示注销链接。在JSP页面的这一行有一个例外：

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

例外情况：

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安全性。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expression=“true”，但这意味着我必须在intercept url标记和java代码中使用expression。有解决办法吗？

Answer 1

只需向应用程序上下文中添加一个即可

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

但最简单的方法就是在