如何将JSP请求的XML数据格式化为表 [英] How to format XML data that is requested from a JSP into a table

问题描述

我有一个.jsp，它确定用户可以访问哪些特定内容.它创建一个XML文件，该文件将被先前的jsp读入流中.如何将读取到char数组流中的XML数据填充到表中?

I have a .jsp which determines what specific things a user has access to. It creates an XML file which is read into a stream by the previous jsp. How would I populate a table with the XML data which is read into a char array stream?

推荐答案

有很多方法可以从XML文件中获取HTML表.一种最干净的方法是将XML解析为传递给JSP的可重复使用的 javabeans 的集合，以便您可以在呈现HTML表时使用 JSTL <c:forEach>对其进行迭代.这样，每一层都保持自己的明确责任. JAXB 提供的Java SE在此方面非常有帮助.

There are a lot of ways to get a HTML table out of the XML file. One of the most clean ways is to parse that XML into a collection of reuseable javabeans which you pass to the JSP, so that you can use JSTL <c:forEach> to iterate over it while rendering a HTML table. This way every layer keeps its own clear responsibility. The Java SE provided JAXB is very helpful in this.

想象一下您的XML看起来像这样:

Imagine that your XML look like this:

<data>
    <entry>
        <key>foo1</key>
        <value>bar1</value>
    </entry>
    <entry>
        <key>foo2</key>
        <value>bar2</value>
    </entry>
    <entry>
        <key>foo3</key>
        <value>bar3</value>
    </entry>
</data>

然后，您可以按以下方式创建JAXB javabean:

Then you can create a JAXB javabean as follows:

@XmlRootElement
public class Data {

    @XmlElement(name="entry")
    private List<Entry> entries;

    public List<Entry> getEntries() {
        return entries;
    }

    public static class Entry {

        @XmlElement
        private String key;

        @XmlElement
        private String value;

        public String getKey() {
            return key;
        }

        public String getValue() {
            return value;
        }

    }

}

然后您可以将其转换为List<Entry>，如下所示:

Then you can transform it into a List<Entry> as follows:

List<Entry> entries = JAXBContext.newInstance(Data.class).createUnmarshaller().unmarshal(inputStream).getEntries();

然后，您可以在转发请求之前，将 servlet (或JSP?:/)存储在请求范围中到JSP:

Then you can let your servlet (or JSP? :/ ) store it in the request scope before forwarding the request to the JSP:

request.setAttribute("entries", entries);

最后，您可以在JSP中对其进行迭代，并将其显示为HTML表:

Finally you can in JSP iterate over it and present it as a HTML table:

<table>
    <c:forEach items="${entries}" var="entry">
        <tr>
            <td><c:out value="${entry.key}" /></td>
            <td><c:out value="${entry.value}" /></td>
        </tr>
    </c:forEach>
</table>

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