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public class StrutsPrepareAndExecuteFilter implements StrutsStatics, Filter {
protected PrepareOperations prepare;
protected ExecuteOperations execute;
protected List<Pattern> excludedPatterns = null;
public void init(FilterConfig filterConfig) throws ServletException {
InitOperations init = new InitOperations();
Dispatcher dispatcher = null;
try {
FilterHostConfig config = new FilterHostConfig(filterConfig);
init.initLogging(config);
dispatcher = init.initDispatcher(config);
init.initStaticContentLoader(config, dispatcher); prepare = new PrepareOperations(dispatcher);
execute = new ExecuteOperations(dispatcher);
this.excludedPatterns = init.buildExcludedPatternsList(dispatcher); postInit(dispatcher, filterConfig);
} finally {
if (dispatcher != null) {
dispatcher.cleanUpAfterInit();
}
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 {
if (excludedPatterns != null && prepare.isUrlExcluded(request, excludedPatterns)) {
chain.doFilter(request, response);
} else {
prepare.setEncodingAndLocale(request, response);
prepare.createActionContext(request, response);
prepare.assignDispatcherToThread();
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();
}
}
1 过滤器在服务器启动时候创建，创建过滤器时候执行init方法
（1）在init方法中主要加载配置文件
– 包含自己创建的配置文件和struts2自带配置文件
** struts.xml
** web.xml
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