struts2配置文件struts.xml放在src目录下，如果处理业务逻辑较多，会造成文件的可读性降低，从而会用到include标签，切记：这个标签相对的是classpath而不是相对文件的相对路径，在web.xml中修改如下代码
<init-param>
   <param-name>config</param-name>
  <param-value>../struts2/struts.xml</param-value>
   </init-param>
当我做到这些的时候，加载项目，为什么会报com.opensymphony.xwork2.inject.DependencyException: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory).
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:144)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMethods(ContainerImpl.java:113)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:90)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:86)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:71)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:67)
at com.opensymphony.xwork2.inject.util.ReferenceCache$CallableCreate.call(ReferenceCache.java:150)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.opensymphony.xwork2.inject.util.ReferenceCache.internalCreate(ReferenceCache.java:76)
at com.opensymphony.xwork2.inject.util.ReferenceCache.get(ReferenceCache.java:116)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:483)
at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:523)
at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:521)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:574)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:521)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:192)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:374)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:273)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:254)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:372)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:98)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4382)
at org.apache.catalina.core.StandardContext$2.call(StandardContext.java:5040)
at org.apache.catalina.core.StandardContext$2.call(StandardContext.java:5035)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory).
at com.opensymphony.xwork2.inject.ContainerImpl.createParameterInjector(ContainerImpl.java:235)
at com.opensymphony.xwork2.inject.ContainerImpl.getParametersInjectors(ContainerImpl.java:225)
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.<init>(ContainerImpl.java:287)
at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:117)
at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:114)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:141)
... 33 more

classpath:struts2/struts.xml

struts.xml 中:

<!-- 加载 classpath 下的 struts 目录中的所有符合命名规范的配置文件 -->	
<include file="struts/struts-*.xml" />

尽量不要写在 web.xml 中.