一段时间以来,我一直在努力理解 spring-security,除了 logout
方面之外,我已经了解了大部分内容。通过其他关于 SO 的问题,我觉得他们中的大多数都面临与 session 不终止相关的问题。
另一方面,我面临着完全不同的麻烦。我的安全 XML 文件配置如下:
<http path-type="ant" auto-config="false" use-expressions="true"
access-denied-page="/?login_error=2">
<intercept-url pattern="/web/open/**" access="permitAll" />
<intercept-url pattern="/web/**" access="isAuthenticated()" />
<form-login login-processing-url="/static/j_spring_security_check"
default-target-url="/web/base/view" always-use-default-target="true"
login-page="/" authentication-failure-url="/?login_error=1" />
<logout logout-url="/static/j_spring_security_logout"
invalidate-session="true" logout-success-url="/" />
</http>
在我的 web.xml
中,我已经将 login controller
映射到上下文根 [使用 welcome-file
列表],并且还具有所需的 springSecurityFilterChain
设置。现在登录操作运行完美。目标 JSP 有一个注销链接:
<a href="<c:url value="/static/j_spring_security_logout"/>">Logout</a>
但是,每当我单击注销链接时,我都会收到一个可怕的 NullPointerException
。如果我在这里犯了一些明显的错误,谁能告诉我?
异常堆栈:
java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:334)
at org.apache.tomcat.util.http.Parameters.getParameterValues(Parameters.java:116)
at org.apache.tomcat.util.http.Parameters.getParameter(Parameters.java:127)
at org.apache.catalina.connector.Request.getParameter(Request.java:1133)
at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:384)
at javax.servlet.ServletRequestWrapper.getParameter(ServletRequestWrapper.java:140)
at org.springframework.security.web.authentication.AbstractAuthenticationTargetUrlRequestHandler.determineTargetUrl(AbstractAuthenticationTargetUrlRequestHandler.java:86)
at org.springframework.security.web.authentication.AbstractAuthenticationTargetUrlRequestHandler.handle(AbstractAuthenticationTargetUrlRequestHandler.java:67)
at org.springframework.security.web.authentication.logout.SimpleUrlLogoutSuccessHandler.onLogoutSuccess(SimpleUrlLogoutSuccessHandler.java:28)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:100)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:168)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
感谢您抽出宝贵时间。
最佳答案
AbstractAuthenticationTargetUrlRequestHandler
中的determineTargetUrl
方法似乎无法获取请求参数。对我来说,通常可以提供一个 defaultTargetUrl
并将 alwaysUseDefaultTargetUrl
设置为 true
这意味着 determineTargetUrl
总是返回给定的URL 和防止 URL 确定魔术。
我会通过注册我自己的 LogoutSuccessHandler
实现来做到这一点,例如:
<logout
logout-url="/static/j_spring_security_logout"
invalidate-session="true"
success-handler-ref="myLogoutSuccessHandler" />
代替 logout-success-url
。
LogoutSuccessHandler
看起来很简单:
public class MyLogoutSuccessHandler extends AbstractAuthenticationTargetUrlRequestHandler implements LogoutSuccessHandler {
@Override
public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication throws IOException, ServletException {
// maybe do some other things ...
super.handle(request, response, authentication);
}
}
在为自定义 LogoutSuccessHandler
定义 bean 时,在安全上下文中将注销 URL 设置为 defaultTargetUrl
:
<bean id="myLogoutSuccessHandler" class="foobar.impl.MyLogoutSuccessHandler">
<property name="defaultTargetUrl" value="/" />
<property name="alwaysUseDefaultTargetUrl" value="true" />
</bean>
关于java - spring security注销导致NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7325655/