如何解决在Spring中正确的mvc:interceptor配置
| 我有点问题。我需要在此拦截器中调用每个请求的postHandle方法:public class DiMenuInterceptor extends handlerinterceptorAdapter {
@Autowired
private IDiCategoryService categoryService;
@Override
public void postHandle(HttpServletRequest request,HttpServletResponse response,Object handler,ModelAndView modelAndView) throws Exception {
modelAndView.addobject(\"category\",categoryService.getCategoryInTree());
}
}
所以我将这一行放入servlet配置中,一切正常。
<bean class=\"org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping\" p:interceptors-ref=\"menuInterceptor\" />
<bean id=\"menuInterceptor\" class=\"cz.cosi.DiMenuInterceptor\" />
但是现在我必须更改配置并使用<mvc:interceptors>
通过这种配置,我在postHandle方法中的modelAndView上获得了一系列空指针异常,因为每个请求多次调用postHandle方法。
<mvc:interceptors>
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptors>
使用此配置,它可以工作,但仅适用于请求serverAdress /任何东西。对于请求serverAdress /任何东西/东西不调用postHandle。
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path=\"/*\" />
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptor>
</mvc:interceptors>
servlet配置的一部分
<mvc:annotation-driven />
<bean id=\"messageSource\"
class=\"org.springframework.context.support.ReloadableResourceBundleMessageSource\">
<property name=\"basename\" value=\"classpath:messages\" />
<property name=\"defaultEncoding\" value=\"UTF-8\" />
</bean>
<mvc:resources mapping=\"/css/**\" location=\"/css/\" />
<mvc:resources mapping=\"/images/**\" location=\"/images/\" />
<mvc:resources mapping=\"/js/**\" location=\"/js/\" />
<mvc:interceptors>
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptors>
<tx:jta-transaction-manager />
<tx:annotation-driven />
<bean id=\"transactionManager\"
class=\"org.springframework.orm.hibernate3.HibernateTransactionManager\">
<property name=\"sessionFactory\" ref=\"sessionFactory\" />
</bean>
看来,问题可能与资源有关,因为没有正确加载图像,样式和javascript例外。没有mvc:resources可以正常工作,但这不是解决方案。
我的问题是,如何用<mvc:interceptors>
正确配置DiMenuInterceptor。非常感谢您的建议。
堆:
2011-04-14 09:56:02,487 [http-8080-3] DEBUG (FilterChainProxy.java:195) ? Converted URL to lowercase,from: \'/images/core/users/super_admin.png\'; to: \'/images/core/users/super_admin.png\'
2011-04-14 09:56:02,533 [http-8080-3] DEBUG (FilterChainProxy.java:202) ? Candidate is: \'/images/core/users/super_admin.png\'; pattern is /images/**; matched=true
2011-04-14 09:56:02,533 [http-8080-3] DEBUG (FilterChainProxy.java:158) ? /images/core/users/super_admin.png has an empty filter list
14.4.2011 9:56:02 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet spring threw exception
java.lang.NullPointerException
at cz.cosi.DiMenuInterceptor.postHandle(DiMenuInterceptor.java:41)
at org.springframework.web.servlet.dispatcherServlet.dodispatch(dispatcherServlet.java:801)
at org.springframework.web.servlet.dispatcherServlet.doService(dispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:163)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:595)
也许我找到了解决方案,但这绝对不是最好的。目前看来,这是可行的。
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path=\"/*\" />
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path=\"/search/**\" />
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path=\"/context/**\" />
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path=\"/member/**\" />
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptor>
</mvc:interceptors>
解决方法
您需要指定路径包括子路径:“ 9”而不是“ 10”。
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path=\"/**\" />
<bean class=\"cz.cosi.DiMenuInterceptor\" />
</mvc:interceptor>
</mvc:interceptors>
@see Spring Reference中的Excample,第15.12.2章mvc:interceptors
,问题在于,在请求资源时会调用拦截器。
这篇文章讨论了如何防止使用xml配置调用拦截器。在公认的答案中,我不是非常依赖路径的语义构成(即使用.html或在路径中包含页面)。现在,团队中的所有开发人员在创建控制器时都必须意识到这一点。
我也不喜欢详细的bean配置,因此我决定将以下代码添加到拦截器中:
if (ClassUtils.isAssignableValue(ResourceHttpRequestHandler.class,handler)) {
return;
}
// do interceptor logic here...
,我遇到了非常相似的问题,但是访问了Bootstrap 3的字体。拦截器阻止了诸如''glyphicons-halflings-regular.woff''或\'glyphicons-halflings-regular.ttf \'等字体资源,并且它们在首页中不可见。
我通过以下方式解决了我的问题。
我的拦截器的定义如下所示:
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path=\"/**\"/>
<bean class=\"cz.cosi.DiMenuInterceptor\"/>
</mvc:interceptor>
</mvc:interceptors>
还有我的DiMenuInterceptor类:
public class DiMenuInterceptor extends HandlerInterceptorAdapter {
private List<String> nonAuthPaths;
public DiMenuInterceptor() {
nonAuthPaths = new ArrayList<String>();
nonAuthPaths.add(\"/login\");
nonAuthPaths.add(\"/resources/vendor/fonts/glyphicons-halflings-regular.woff\");
nonAuthPaths.add(\"/resources/vendor/fonts/glyphicons-halflings-regular.ttf\");
}
@Override
public boolean preHandle(HttpServletRequest request,HttpServletResponse response,Object handler) throws Exception {
Object user = request.getSession().getAttribute(SessionManagement.USER_KEY);
if (user == null && !nonAuthPaths.contains(request.getServletPath())) {
response.sendRedirect(request.getContextPath() + \"/login\");
}
return false;
} else {
//ect ...
return true;
}
}
,我也有同样的问题。初始配置:
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path=\"/*\"/>
<bean class=\"cn.mmd.micro.common.TokenInterceptor\">
<property name=\"excludeUrls\">
<list>
<value>/app/token</value>
</list>
</property>
</bean>
</mvc:interceptor>
</mvc:interceptors>
我更改了值\“ mvc:mapping \”,它起作用了。我的新配置如下:
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path=\"/**\"/>
<bean class=\"cn.mmd.micro.common.TokenInterceptor\">
<property name=\"excludeUrls\">
<list>
<value>/app/token</value>
</list>
</property>
</bean>
</mvc:interceptor>
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