默认情况下，Struts2的配置文件名称为struts.xml，且该文件放在src根目录下。如下图所示：
如果需要修改struts.xml的位置，例如把struts.xml放到struts2文件夹下，结构如下图所示，该怎么办呢？
Struts2在web.xml中的一般配置如下：
为了弄清Stuts2是如何加载配置文件的，先查看Struts2的StrutsPrepareAndExecuteFilter类：
package org.apache.struts2.dispatcher.ng.filter;
/**
* Handles both the preparation and execution phases of the Struts dispatching process. This filter is better to use
* when you don't have another filter that needs access to action context information, such as Sitemesh.
*/
public class StrutsPrepareAndExecuteFilter implements StrutsStatics, Filter {
protected PrepareOperations prepare;
protected ExecuteOperations execute;
protected List
public void init(FilterConfig filterConfig) throws ServletException {
InitOperations init = new InitOperations();
try {
FilterHostConfig config = new FilterHostConfig(filterConfig);
init.initLogging(config);
Dispatcher dispatcher = init.initDispatcher(config);
init.initStaticContentLoader(config, dispatcher);
prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
this.excludedPatterns = init.buildExcludedPatternsList(dispatcher);
postInit(dispatcher, filterConfig);
} finally {
init.cleanup();
}
}
/**
* Callback for post initialization
*/
protected void postInit(Dispatcher dispatcher, FilterConfig filterConfig) {
}
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
try {
prepare.setEncodingAndLocale(request, response);
prepare.createActionContext(request, response);
prepare.assignDispatcherToThread();
if ( excludedPatterns != null && prepare.isUrlExcluded(request, excludedPatterns)) {
chain.doFilter(request, response);
} else {
request = prepare.wrapRequest(request);
ActionMapping mapping = prepare.findActionMapping(request, response, true);
if (mapping == null) {
boolean handled = execute.executeStaticResourceRequest(request, response);
if (!handled) {
chain.doFilter(request, response);
}
} else {
execute.executeAction(request, response, mapping);
}
}
} finally {
prepare.cleanupRequest(request);
}
}
public void destroy() {
prepare.cleanupDispatcher();
}
}
可以看到，有个public void init(FilterConfig filterConfig) throws ServletException { ... } 方法，很明显，这个方法在启动时会被调用，然后加载classes目录下的struts.xml配置文件。配置文件参数名称为filterConfig。因此，我们可以指定Struts2 Filter 的参数，这和指定Servlet参数相同，配置
这样配置后，就可以正常加载指定的Struts配置文件了。