struts2创建actioncontext源码分析图

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

//创建actioncontext的方法

 prepare.createActionContext(request, response);

}

public ActionContext createActionContext(HttpServletRequest request, HttpServletResponse response) {

//创建一个值栈对象来存放map对象

ValueStack stack = dispatcher.getContainer().getInstance(ValueStackFactory.class).createValueStack();
          //putALL里面的对象放到值栈的context里面去

        stack.getContext().putAll(dispatcher.createContextMap(request, response, null, servletContext));
          //把值栈context复制一份到actioncontext中去 

        ctx = new ActionContext(stack.getContext());

}

public Map createContextMap(HttpServletRequest request, HttpServletResponse response,
            ActionMapping mapping, ServletContext context) {


        // 把内置对象封装到Map中去
        Map requestMap = new RequestMap(request);
        Map params = new HashMap(request.getParameterMap());
        Map session = new SessionMap(request);
        Map application = new ApplicationMap(context);

//把内置对象和相应的Map交给createContextMap
        Map extraContext = createContextMap(requestMap, params, session, application, request, response, context);

}

//把所有的Map数据存放到extraContext

public HashMap createContextMap(Map requestMap,
                                    Map parameterMap,
                                    Map sessionMap,
                                    Map applicationMap,
                                    HttpServletRequest request,
                                    HttpServletResponse response,
                                    ServletContext servletContext) {
        HashMap extraContext = new HashMap();
        extraContext.put(ActionContext.PARAMETERS, new HashMap(parameterMap));
        extraContext.put(ActionContext.SESSION, sessionMap);
        extraContext.put(ActionContext.APPLICATION, applicationMap);


        Locale locale;
        if (defaultLocale != null) {
            locale = LocalizedTextUtil.localeFromString(defaultLocale, request.getLocale());
        } else {
            locale = request.getLocale();
        }


        extraContext.put(ActionContext.LOCALE, locale);
        //extraContext.put(ActionContext.DEV_MODE, Boolean.valueOf(devMode));


        extraContext.put(StrutsStatics.HTTP_REQUEST, request);
        extraContext.put(StrutsStatics.HTTP_RESPONSE, response);
        extraContext.put(StrutsStatics.SERVLET_CONTEXT, servletContext);


        // helpers to get access to request/session/application scope
        extraContext.put("request", requestMap);
        extraContext.put("session", sessionMap);
        extraContext.put("application", applicationMap);
        extraContext.put("parameters", parameterMap);


        AttributeMap attrMap = new AttributeMap(extraContext);
        extraContext.put("attr", attrMap);


        return extraContext;
    }