在Wicket 1.5中将页面渲染为字符串

Question

我正在努力将现有的Wicket webapp升级到1.5,并且在我们用于呈现HTML电子邮件的renderPage函数中遇到了麻烦.

以前我们使用此StackOverflow问题中引用/列出的代码和此(当前已损坏但稍后可能已修复)链接,但该代码不再有效,因为1.5中不存在很多这些类.

我也发现了这个电子邮件主题,但它对细节很清楚,我不知道如何从我的pageClass和参数创建WebPage. http://apache-wicket.1842946.n4.nabble.com/Render-WebPage-to-String-in-Wicket-1-5-td3622130.html

这是我的代码:

// Renders a page under a temporary request cycle in order to get the rendered markup
public static String renderPage(Class<? extends Page> pageClass, PageParameters pageParameters)
{
    //get the servlet context
    WebApplication application = (WebApplication) WebApplication.get();

    ServletContext context = application.getServletContext();

    //fake a request/response cycle
    MockHttpSession servletSession = new MockHttpSession(context);
    servletSession.setTemporary(true);

    MockHttpServletRequest servletRequest = new MockHttpServletRequest(application, servletSession, context);

    MockHttpServletResponse servletResponse = new MockHttpServletResponse(servletRequest);

    //initialize request and response
    servletRequest.initialize();
    servletResponse.initialize();

    WebRequest webRequest = new ServletWebRequest(servletRequest);

    BufferedWebResponse webResponse = new BufferedWebResponse(servletResponse);
    webResponse.setAjax(true);

    WebRequestCycle requestCycle = new WebRequestCycle(application, webRequest, webResponse);
    requestCycle.setRequestTarget(new BookmarkablePageRequestTarget(pageClass, pageParameters));

    try
    {
        requestCycle.getProcessor().respond(requestCycle);

        if (requestCycle.wasHandled() == false)
        {
            requestCycle.setRequestTarget(new WebErrorCodeResponseTarget(HttpServletResponse.SC_NOT_FOUND));
        }
    }
    finally
    {
        requestCycle.detach();
        requestCycle.getResponse().close();
    }

    return webResponse.toString();
}

具体来说,代码中断,因为WebRequestCycle和BookmarkablePageRequestTarget类不再存在.我觉得我应该能够使用这个StringResponse类,但我错过了可以帮助我触发该响应的渲染的链接.

任何帮助,将不胜感激.谢谢.

我的最终解决方案

使用我在下面的答案中指示的示例,我最终得到以下代码.我也在这里粘贴它,以便如果该链接消失或者使用未来版本的Wicket进行更改,那么未来的人们仍然可以获得他们需要的答案.

我最终传入了一个PageProvider因为在某些情况下我需要传递一个实例化的,Page而在其他情况下传递一个pageClass +参数.

public static String renderPage(final PageProvider pageProvider)
{
    final RenderPageRequestHandler handler = new RenderPageRequestHandler(pageProvider, RedirectPolicy.NEVER_REDIRECT);

    final PageRenderer pageRenderer = Application.get().getPageRendererProvider().get(handler);

    RequestCycle requestCycle = RequestCycle.get();

    final Response oldResponse = requestCycle.getResponse();
    BufferedWebResponse tempResponse = new BufferedWebResponse(null);

    try
    {
        requestCycle.setResponse(tempResponse);
        pageRenderer.respond(requestCycle);
    }
    finally
    {
        requestCycle.setResponse(oldResponse);
    }

    return tempResponse.getText().toString();
}

Answer 1

检查http://www.wicket-library.com/wicket-examples/mailtemplate/示例的源代码。