只有在用户通过身份验证后,才能在JSP页面中显示注销链接。以下是我在JSP页面的这一行中的例外:
<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application-context-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标签中使用use-expression =“true”,但这意味着我必须在intercept-url标签和java代码中使用表达式。有解决方法吗?
答案 0 :(得分:44)
您只需在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" />
但最简单的方法是在<http>
配置中启用表达式,并为您添加一个表达式。这只意味着您必须在该块中使用表达式,而不是在Java代码中使用,例如方法@Secured
注释。