ErrorMessageHandler
該類處理XML消息生成器的功能。此Java類將構(gòu)建基于identity和description屬性的XML消息。調(diào)用方調(diào)用了buildXMLMessage之后，它將準(zhǔn)備文檔并設(shè)置XML消息的根元素。此類還具有一個(gè)addNextXMLMessage函數(shù)，以將更多驗(yàn)證消息添加到XML（參見清單1）。
清單1
...
public void buildXMLMessage() throws ParserConfigurationException {
// initiate document builder to prepare the media of XML Message
this.rootElement = new Element(CONSTANT_MESSAGE);
addNextXMLMessage();
}
...
public void addNextXMLMessage() throws ParserConfigurationException {
// creating the xml message based on format above Element
identityElement = new Element(CONSTANT_IDENTITY);
identityElement.setAttribute(CONSTANT_NAME, this.identity);
Element descriptionElement = new Element(CONSTANT_DESCRIPTION);
descriptionElement.addContent(this.description);
identityElement.addContent(descriptionElement);
rootElement.addContent(identityElement);
} |
此流程方法將響應(yīng)的內(nèi)容類型設(shè)置為“text/xml”，并將XML消息作為字符串發(fā)送。AjaxValidationRequestProcessor代碼上的流程函數(shù)如清單2所示。
清單2
public void process(HttpServletRequest req, HttpServletResponse resp)
throws IOException, ServletException
{
if ( request.getParameter(CONSTANT_VALIDATION_FRAMEWORK_ARG) != null )
{
...
this.processValidate(req, resp, form, mapping);
response.setContentType(CONSTANT_XML_CONTENT_TYPE);
response.getWriter().write(sbXMLMessage.toString());
response.flushBuffer();
}
}
else { super.process(req, resp); }
} |
processValidation方法將填充
動(dòng)作錯(cuò)誤，并基于面向客戶端的XML格式契約構(gòu)建消息。AjaxValidationRequestProcessor代碼上的processValidation函數(shù)如下所示：
...
ActionErrors errors = (ActionErrors) request.getAttribute(Globals.ERROR_KEY);
Locale locale = (Locale) request.getAttribute(Globals.LOCALE_KEY);
generateXMLMessage(errors, identity, locale, sbXMLMessage);
...
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