在JSP视图中使RDF模型可访问的最佳方法是什么？

Question

I am writing an Java web application that fetches RDF data from URIs and stores them in a Jena Model object. 我正在编写一个Java Web应用程序，该应用程序从URI获取RDF数据并将其存储在Jena Model对象中。 Currently the models contain ordinary triples, some Blank Nodes, no inference. 当前，模型包含普通三元组，一些空白节点，没有推断。 (That is described here already 1 ). （这里已经描述过1 ）。 Using Sesame would be an option, too. 也可以选择使用芝麻。

After data collection, the application displays some of the collected information in a specified order. 数据收集之后，应用程序将以指定的顺序显示一些收集的信息。 It would be necessary to build filters on the model using predicates only and filters specifiying subject & predicate (as we will collect data from several sources); 有必要仅使用谓词在模型上构建过滤器，并指定主题和谓词的过滤器（因为我们将从多个来源收集数据）； in each case, the object-literal or URI would be displayed. 在每种情况下，都会显示对象文字或URI。

What would be the best way to generically access the model's contents from a JSP-View (without writing custom tags for each function)? 从JSP-View通用访问模型内容的最佳方法是什么（不为每个函数编写自定义标签）？

The JSP-View would look like this: JSP视图将如下所示：

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
    <head></head>
    <body>
        <img src="${modelBean.model.depictionPred}"/>
        Name: <c:out value="${modelBean.model.namePred}"/><br/>
        Life dates: <c:out value="${modelBean.model.birthPred}"/>-<c:out value="${modelBean.model.deathPred}"/><br/>
        Links: <a href="${modelBean.model.linkPred}">Linktext</a><br/>
        ...
    </body>
</html>

Jena-Servlet to collect data: Jena-Servlet收集数据：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            ModelBean modelBean = new ModelBean();
            Model model = ModelFactory.createDefaultModel();
            model.read("http://dbpedia.org/resource/Ludwig_van_Beethoven");
            modelBean.setModel(model);
            request.setAttribute("modelBean", modelBean);
            RequestDispatcher rd = request.getRequestDispatcher("/view.jsp");
            rd.forward(request, response);
        }

Sesame-Variant of the Servlet: Servlet的Sesame-Variant：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        ModelBean modelBean = new ModelBean();

        URL url = new URL("http://dbpedia.org/resource/Ludwig_van_Beethoven");
        URLConnection conn = url.openConnection();
        conn.addRequestProperty("Accept", RDFFormat.TURTLE.getDefaultMIMEType());
        InputStream is = conn.getInputStream();
        try {
           Model model = Rio.parse(is, url.toString(), RDFFormat.forMIMEType(conn.getContentType()));
        } catch (RDFParseException ex) {
           Logger.getLogger(ModelViewTester.class.getName()).log(Level.SEVERE, null, ex);
        } 
        finally {
           is.close(); 
        }
        modelBean.setModel(model);
        request.setAttribute("modelBean", modelBean);
        RequestDispatcher rd = request.getRequestDispatcher("/view.jsp");
        rd.forward(request, response);
    }

Answer 1

Apart from the fact that something may be possible by providing parameters to calls on bean methods (see How to call parameterized method from JSP using JSTL/EL ) I'm afraid you'll have to either create custom tags, or you need to rethink your access strategy. 除了可以通过为bean方法的调用提供参数来实现某些事情（请参阅如何使用JSTL / EL从JSP调用参数化方法）之外，我担心您还必须创建自定义标签，或者需要重新考虑您的访问策略。

For example, rather than putting the entire RDF Model into your response, you could do the extraction of relevant data at the servlet-side, and just put the relevant properties that you want to display in your view response, as separate bean properties. 例如，您可以在servlet端提取相关数据，而不是将整个RDF Model放入响应中，而只是将要显示在视图响应中的相关属性作为单独的bean属性。

在JSP视图中使RDF模型可访问的最佳方法是什么？

问题描述

1 个解决方案

解决方案1
0 已采纳 2014-02-16 20:55:48

在JSP视图中使RDF模型可访问的最佳方法是什么？

问题描述

1 个解决方案

解决方案1 0 已采纳 2014-02-16 20:55:48

解决方案1
0 已采纳 2014-02-16 20:55:48