Spring中正确的mvc:拦截器配置
我有一个问题。我需要在这个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" />
但现在我必须更改配置并使用
使用此配置,我在 postHandle 方法中的 modelAndView 上收到一系列空指针异常,因为 postHandle 方法被多次调用根据要求。
<mvc:interceptors>
<bean class="cz.cosi.DiMenuInterceptor" />
</mvc:interceptors>
使用此配置,它可以工作,但仅适用于请求服务器地址/任何内容。对于请求 serverAdress/anything/something 未调用 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,问题可能在某种程度上与资源有关,因为除了例外情况之外,图像、样式和 javascript 未正确加载。如果没有 mvc:resources ,它可以正常工作,但这不是解决方案。
我的问题是,如何使用
正确配置 DiMenuInterceptor。非常感谢您的建议。
stack:
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,但它绝对不是最好的。目前看来,这正在发挥作用。
<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>
I have kind of a problem. I need to call on each request postHandle method in this interceptor:
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());
}
}
so I put into servlet configuration this lines and everything work fine.
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" p:interceptors-ref="menuInterceptor" />
<bean id="menuInterceptor" class="cz.cosi.DiMenuInterceptor" />
But now I have to change configuration and use <mvc:interceptors>
With this configuration, I'm getting series of null pointer exception on modelAndView in the postHandle method because the postHandle method is called more than once per request.
<mvc:interceptors>
<bean class="cz.cosi.DiMenuInterceptor" />
</mvc:interceptors>
With this configuration, it is working, but only for request serverAdress/anything. For request serverAdress/anything/something is postHandle not called.
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/*" />
<bean class="cz.cosi.DiMenuInterceptor" />
</mvc:interceptor>
</mvc:interceptors>
part of servlet configuration
<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>
It seems, that the problem might somehow relate to resources, because with exceptions are not properly loaded images, styles, and javascript. Without mvc:resources its working correctly, but this is not a solution.
My question is, how to properly configure DiMenuInterceptor with <mvc:interceptors>
. Thanks very much for the advices.
stack:
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)
Maybe I found a solution, but it is definitely not the best. For now it seems, that is working.
<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>
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您需要指定您的路径包含子路径:
/**"
而不是/*
。@see Excample in Spring Reference, 第 15.12.2 章 mvc:拦截器
Your need to specify that your path includes subpaths:
/**"
instead/*
.@see Excample in Spring Reference, Chapter 15.12.2 mvc:interceptors
问题是当请求资源时会调用拦截器。
这篇帖子讨论了如何防止使用 xml 配置调用拦截器。在接受的答案中,我不太喜欢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:
The problem is that the interceptors are called when resources are requested.
This post talks about how to prevent the interceptors from being called using the xml configuration. In the accepted answer, I am not a big fan of relying on the semantic makeup of the paths (ie using .html or having page in the path). Now all developers on the team have to be aware of this when creating controllers.
I also am not a fan of the verbose bean configuration, so I have decided to add the following code to the interceptor:
我遇到了非常类似的问题,但在访问 Bootstrap 3 的字体时。拦截器阻止了“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我的问题。
我的拦截器的定义如下所示:
我的 DiMenuInterceptor 类:
I had very simillar problem but with accessing to fonts for Bootstrap 3. Interceptors blocked fonts resources like 'glyphicons-halflings-regular.woff' or 'glyphicons-halflings-regular.ttf' and they were not visible in front page.
I resolve my problem in following way.
The definition of my interceptor look like below:
And my DiMenuInterceptor class:
我也有同样的问题。初始配置:
我更改了值“mvc:mapping”,它起作用了。我的新配置如下:
I had the same question too. Initial configuration:
I changed the value "mvc:mapping", and it worked. My new configuration is as follows: