ofbiz中几个占位符

OFBiz认为一些键名为反馈消息的占位符。

进入ScreenRenderer的populateContextForRequest方法可以看到

// setup message lists
        List<String> eventMessageList = UtilGenerics.toList(request.getAttribute("eventMessageList"));
        if (eventMessageList == null) eventMessageList = FastList.newInstance();
        List<String> errorMessageList = UtilGenerics.toList(request.getAttribute("errorMessageList"));
        if (errorMessageList == null) errorMessageList = FastList.newInstance();

        if (request.getAttribute("_EVENT_MESSAGE_") != null) {
            eventMessageList.add(UtilFormatOut.replaceString((String) request.getAttribute("_EVENT_MESSAGE_"), "\n", "<br/>"));
            request.removeAttribute("_EVENT_MESSAGE_");
        }
        List<String> msgList = UtilGenerics.toList(request.getAttribute("_EVENT_MESSAGE_LIST_"));
        if (msgList != null) {
            eventMessageList.addAll(msgList);
            request.removeAttribute("_EVENT_MESSAGE_LIST_");
        }
        if (request.getAttribute("_ERROR_MESSAGE_") != null) {
            errorMessageList.add(UtilFormatOut.replaceString((String) request.getAttribute("_ERROR_MESSAGE_"), "\n", "<br/>"));
            request.removeAttribute("_ERROR_MESSAGE_");
        }
        if (session.getAttribute("_ERROR_MESSAGE_") != null) {
            errorMessageList.add(UtilFormatOut.replaceString((String) session.getAttribute("_ERROR_MESSAGE_"), "\n", "<br/>"));
            session.removeAttribute("_ERROR_MESSAGE_");
        }
        msgList = UtilGenerics.toList(request.getAttribute("_ERROR_MESSAGE_LIST_"));
        if (msgList != null) {
            errorMessageList.addAll(msgList);
            request.removeAttribute("_ERROR_MESSAGE_LIST_");
        }
        context.put("eventMessageList", eventMessageList);
        context.put("errorMessageList", errorMessageList);

        if (request.getAttribute("serviceValidationException") != null) {
            context.put("serviceValidationException", request.getAttribute("serviceValidationException"));
            request.removeAttribute("serviceValidationException");
        }

可以看出来request的Attributes中的占位符主要是
eventMessageList（一个list）
errorMessageList（一个list）
_EVENT_MESSAGE_ （String）
_EVENT_MESSAGE_LIST_ （List）
_ERROR_MESSAGE_ （String）
_ERROR_MESSAGE_LIST_ （String）
serviceValidationException

session中的Attributes中的占位符主要是
_ERROR_MESSAGE_

其中eventMessageList被添加到eventMessageList
errorMessageList被添加到errorMessageList
_EVENT_MESSAGE_  eventMessageList
_EVENT_MESSAGE_LIST_  eventMessageList
_ERROR_MESSAGE_ errorMessageList
_ERROR_MESSAGE_(session) errorMessageList
_ERROR_MESSAGE_LIST_ errorMessageList
最后是将
context.put("eventMessageList", eventMessageList);
        context.put("errorMessageList", errorMessageList);
因此在context能访问到eventMessageList和errorMessageList