我有点问题。我需要在这个拦截器中调用每个请求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());
}
}
所以我把这些行放入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<mvc:interceptors>
使用这种配置，我在postHandle方法中的modelAndView上得到一系列空指针异常，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，它正在工作，但仅适用于请求serverAdress / any。对于请求serverAdress / anything / something is postHandle not called。
<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>
似乎问题可能以某种方式与资源相关，因为异常没有正确加载图像，样式和javascript。没有mvc：资源，它的工作正常，但这不是一个解决方案。
我的问题是，如何使用<mvc:interceptors>正确配置DiMenuInterceptor。非常感谢您的建议。
堆栈：
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，但绝对不是最好的解决方案。现在看来，这是有效的。
<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>
答案 0 :(得分：15)
您需要指定路径包含子路径：/**"而不是/*。
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**" />
<bean class="cz.cosi.DiMenuInterceptor" />
</mvc:interceptor>
</mvc:interceptors>
@see Spring Reference Chapter 15.12.2 mvc:interceptors
中的Excample答案 1 :(得分：1)
问题是在请求资源时会调用拦截器。
这个post讨论了如何防止使用xml配置调用拦截器。在接受的答案中，我不依赖于路径的语义构成（即使用.html或在路径中有页面）。现在，团队中的所有开发人员在创建控制器时都必须注意这一点。
我也不喜欢详细的bean配置，所以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...
答案 2 :(得分：0)
我有非常类似的问题，但访问Bootstrap 3的字体。拦截器阻止了字体资源，如＆glyphicons-halflings-regular.woff＆＃39;或者＆＃39; glyphicons-halflings-regular.ttf＆＃39;并且它们在头版中不可见。 我以下列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>
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;
}
}
答案 3 :(得分：0)
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＆＃34; mvc：mapping＆＃34;，它有效。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>