Java 如何从xml中获取指定的根？

我有如下XML文件

拉贾
xyz
液压
abc
16
216

实现这一点的一种方法是使用JDK附带的DOM解析器。例如：

import org.w3c.dom.Document;
import org.xml.sax.InputSource;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.StringReader;

...

// Creates a new DOM parser instance.
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();

// Parses XML and creates a DOM document object.
// The XML variable is your XML document above stored as a string, but you could
// easily read the contents from a file or database too.
Document document = documentBuilder.parse(new InputSource(new StringReader(XML)));

// Get the text content of <theatername> using the DOM API and print it to stdout.
String theaterName = document.getElementsByTagName("theatername").item(0).getTextContent().trim();
System.out.println(theaterName);

---

简而言之，您不能这样做，因为您显示的输入不是有效的XML，并且不能由XML解析器（以任何语言）解析为XML。它无效，因为它有多个根元素。在将其解析为XML之前，您需要将其拆分为多个文件。请发布准确的预期结果（作为代码）。我们如何使用stax实现？

XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(new StringReader(XML));
String theaterName = null;
while (xmlStreamReader.hasNext()) {
    if (xmlStreamReader.next() == XMLStreamConstants.START_ELEMENT) {
        if ("theatername".equals(xmlStreamReader.getLocalName())) {
            theaterName = xmlStreamReader.getElementText().trim();
        }
    }
}
System.out.println(theaterName);