Struts 1.3.8 Action實現類中消息的輸出及JSP頁面中消息標簽的使用總結

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(1)Action中保存消息及錯誤的簡單實現：……//此處是ActionMessages是帶’s’的類名ActionMessages messages = new ActionMessages();//向messages添加一個消息對象，并設定property為“sucess”messages.add(“sucess”, new ActionMessage(“source.key”));//將消息集合保存到request中，并以“org.apache.struts.action.ACTION_MESSAGE”為關鍵字；此方法可在下面看到Action類中實現的源代碼saveMessages(request,messages);//將消息集合保存到request中，并以“org.apache.struts.action.ERROR”為關鍵字；此方法可在下面看到Action類中實現的源代碼saveErrors(request,messages);……(2)Struts 1.3.8中的Action中保存消息和錯誤的源代碼如下：protected void addMessages(HttpServletRequest request, ActionMessages messages){if (messages == null)return;ActionMessages requestMessages = (ActionMessages)request.getAttribute("org.apache.struts.action.ACTION_MESSAGE");if (requestMessages == null)requestMessages = new ActionMessages();requestMessages.add(messages);if (requestMessages.isEmpty()){request.removeAttribute("org.apache.struts.action.ACTION_MESSAGE");return;} else{request.setAttribute("org.apache.struts.action.ACTION_MESSAGE", requestMessages);return;}}protected void addErrors(HttpServletRequest request, ActionMessages errors){if (errors == null)return;ActionMessages requestErrors = (ActionMessages)request.getAttribute("org.apache.struts.action.ERROR");if (requestErrors == null)requestErrors = new ActionMessages();requestErrors.add(errors);if (requestErrors.isEmpty()){request.removeAttribute("org.apache.struts.action.ERROR");return;} else{request.setAttribute("org.apache.struts.action.ERROR", requestErrors);return;}}(3)JSP頁面中用和標簽輸出：…………MessagesTag的實現類構造如下：public MessagesTag(){iterator = null;processed = false;id = null;bundle = null;locale = "org.apache.struts.action.LOCALE";name = "org.apache.struts.action.ERROR";property = null;header = null;footer = null;message = null;}