Question

我正在尝试从大型xml文件中删除节点。使用此代码，其他元素的标记也会被更改。我希望有人可以解释为什么或如何解决它。

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            Document document = dbf.newDocumentBuilder().parse(new File(filePath)); //filePath - source file
            /*while (document.getElementsByTagName("IMFile").getLength() != 0){
//Loop until all childs are removed
                    Element element = (Element) document.getElementsByTagName("IMFile").item(0);
                element.getParentNode().removeChild(element);
            }*/
            //Test for first appearance
            Element element = (Element) document.getElementsByTagName("IMFile").item(0);
            element.getParentNode().removeChild(element);

            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer t = tf.newTransformer();
            t.transform(new DOMSource(document), new StreamResult(new File(filePath+"_New"))); //destination

它改变了xml的位置，例如：

<Attribute id="7" value="1920" name="width"/>至<Attribute id="7" name="width" value="1920"/>

它也切断了一些开放或结束标签： <PowerPointFilename></PowerPointFilename＆GT;到<PowerPointFilename/>

Answer 1

您可以使用SAX转换器修改XML文档，同时保留属性顺序：

public static void main(String[] args) throws IOException, TransformerException, SAXException {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    TransformerFactory tf = TransformerFactory.newInstance();
    // Load the transformer definition from the file strip.xsl:
    Transformer t = tf.newTransformer(new SAXSource(reader, new InputSource(new FileInputStream("strip.xsl"))));
    // Transform the file test.xml to stdout:
    t.transform(new SAXSource(reader, new InputSource(new FileInputStream("test.xml"))), new StreamResult(System.out));
}

这是一个剥离IMFile元素的XSL转换：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

    <!-- Copy -->
    <xsl:template match="node()|@*">
        <xsl:copy>
            <xsl:apply-templates select="node()|@*"/>
        </xsl:copy>
    </xsl:template>

    <!-- Strip IMFile elements -->
    <xsl:template match="IMFile"/>
</xsl:stylesheet>

Java XML删除节点

1 个答案: