从流中包含包含 JSF 标签/组件的动态内容 [英] Include dynamic content containing JSF tags/components from stream

问题描述

我正在开发一个应用程序，我想在其中包含来自流的动态 XHTML 内容.为了解决这个问题，我编写了一个 taghandler 扩展，它将动态 XHTML 内容转储到输出组件

I am working on an application where I would like to include dynamic XHTML content from a stream. To handle this I wrote a taghandler extension which dumps the dynamic XHTML content to output component as

UIOutput htmlChild = (UIOutput) ctx.getFacesContext().getApplication().createComponent(UIOutput.COMPONENT_TYPE);
htmlChild.setValue(new String(outputStream.toByteArray(), "utf-8"));

这适用于没有 JSF 标签的 XHTML 内容.如果我的动态 XHTML 内容中有 JSF 标记，例如 <h:inputText value="#{bean.item}"/>，那么它们将打印为纯文本.我希望它们呈现为输入字段.我怎样才能做到这一点?

This works fine for XHTML content which has no JSF tags. If I have JSF tags in my dynamic XHTML content like <h:inputText value="#{bean.item}"/>, then they're printed as plain text. I want them to render as input fields. How can I achieve this?

推荐答案

本质上，您应该将 与自定义 ResourceHandler 能够返回资源URL 的风格.因此，当拥有 OutputStream 时，您真的应该将其写入(临时)文件，以便您可以从中获取 URL.

Essentially, you should be using an <ui:include> in combination with a custom ResourceHandler which is able to return the resource in flavor of an URL. So when having an OutputStream, you should really be writing it to a (temp) file so that you can get an URL out of it.

例如

<ui:include src="/dynamic.xhtml" />

与

public class DynamicResourceHandler extends ResourceHandlerWrapper {

    private ResourceHandler wrapped;

    public DynamicResourceHandler(ResourceHandler wrapped) {
        this.wrapped = wrapped;
    }

    @Override
    public ViewResource createViewResource(FacesContext context, String resourceName) {
        if (resourceName.equals("/dynamic.xhtml")) {
            try {
                File file = File.createTempFile("dynamic-", ".xhtml");

                try (Writer writer = new FileWriter(file)) {
                    writer
                        .append("<ui:composition")
                        .append(" xmlns:ui='http://java.sun.com/jsf/facelets'")
                        .append(" xmlns:h='http://java.sun.com/jsf/html'")
                        .append(">")
                        .append("<p>Hello from a dynamic include!</p>")
                        .append("<p>The below should render as a real input field:</p>")
                        .append("<p><h:inputText /></p>")
                        .append("</ui:composition>");
                }

                final URL url = file.toURI().toURL();
                return new ViewResource(){
                    @Override
                    public URL getURL() {
                        return url;
                    }
                };
            }
            catch (IOException e) {
                throw new FacesException(e);
            }
        }

        return super.createViewResource(context, resourceName);
    }

    @Override
    public ResourceHandler getWrapped() {
        return wrapped;
    }

}

(警告:基本启动示例！这会为每个请求创建一个新的临时文件，您应该自己发明一个重用/缓存系统)

在faces-config.xml中注册如下

<application>
    <resource-handler>com.example.DynamicResourceHandler</resource-handler>
</application>

<小时>

注意:以上所有内容均针对 JSF 2.2.对于偶然发现此答案的 JSF 2.0/2.1 用户，您应该使用 ResourceResolver 而不是此答案中提供的示例:从外部文件系统或数据库获取 Facelets 模板/文件.重要说明:ResourceResolver 在 JSF 2.2 中被弃用，以支持ResourceHandler#createViewResource().

---

Note: all of above is JSF 2.2 targeted. For JSF 2.0/2.1 users stumbling upon this answer, you should use ResourceResolver instead for which an example is available in this answer: Obtaining Facelets templates/files from an external filesystem or database. Important note: ResourceResolver is deprecated in JSF 2.2 in favor of ResourceHandler#createViewResource().

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