ErrorMessageHandler
该类处理XML消息生成器的功能。此Java类将构建基于identity和description属性的XML消息。调用方调用了buildXMLMessage之后，它将准备文档并设置XML消息的根元素。此类还具有一个addNextXMLMessage函数，以将更多验证消息添加到XML（参见清单1）。
清单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);
} |
此流程方法将响应的内容类型设置为“text/xml”，并将XML消息作为字符串发送。AjaxValidationRequestProcessor代码上的流程函数如清单2所示。
清单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方法将填充
动作错误，并基于面向客户端的XML格式契约构建消息。AjaxValidationRequestProcessor代码上的processValidation函数如下所示：
...
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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