struts2-流程詳解-StrutsPrepareAndExecuteFilter

http://hi.baidu.com/liangzhongbo/item/07be3a560c16bc13da163536

 

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

初始化:

public void init(FilterConfig filterConfig)
throws ServletException
{
InitOperations init = new InitOperations();
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);
excludedPatterns = init.buildExcludedPatternsList(dispatcher);
postInit(dispatcher, filterConfig);
init.cleanup();
break MISSING_BLOCK_LABEL_108;
Exception exception;
exception;
init.cleanup();
throw exception;
}

執行任務

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)

throws IOException, ServletException
{
HttpServletRequest request;
HttpServletResponse response;
request = (HttpServletRequest)req;
response = (HttpServletResponse)res;
prepare.setEncodingAndLocale(request, response);

/*為當前線程創建ActionContext,ActionContext是ThreadLocal的，ActionContent其實就是一個線程安全的HashMap,它內部使用一個HashMap

來儲存相關信息，這個map的構造是使用dispatcher.createContextMap(request, response, null, servletContext)來形成的，這個

map包括的信息有session,request,response，ServletContext，RequestMap，SessionMap等各種信息，可以通

個這個ActionContent取得各種信息，例如ActionContext.getContext().getSession()來獲得當前的Session,

如果要獲得request或者response必須用ServletActionContext它是ActionContent的子類，提供更多的方法，如

果是forward那也會新建一個新的ActionContent,這個新的ActionContent直接使用舊的ActionContent的數據來

構造*/

prepare.createActionContext(request, response);
prepare.assignDispatcherToThread();
if(excludedPatterns != null && prepare.isUrlExcluded(request, excludedPatterns))
{
chain.doFilter(request, response);
} else
{
request = prepare.wrapRequest(request);
org.apache.struts2.dispatcher.mapper.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);
}
}
prepare.cleanupRequest(request);
break MISSING_BLOCK_LABEL_178;
Exception exception;
exception;
prepare.cleanupRequest(request);
throw exception;
}