java - 从java中的XML文件中删除节点及其元素

Question

我有以下 xml:

<table1>
    <row0>
        <column1>String</column1>
        <column2>int</column2>
    </row0>

    <row1>
        <column1>aa</column1>
        <column2>65432</column2>
    </row1>

    <row2>
        <column1>ww</column1>
        <column2>1111</column2>
    </row2>

    <row3>
        <column1>fff</column1>
        <column2>333</column2>
    </row3>

    <row4>
        <column1>jj</column1>
        <column2>2</column2>
    </row4>
</table1>

我想删除节点 row3 及其元素。我正在用 java 编写该 XML 文件。该怎么做？我在另一篇文章中看到这段代码，但无法理解

public static void main(String[] args) throws Exception {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    Document document = dbf.newDocumentBuilder().parse(new File("input.xml"));

    XPathFactory xpf = XPathFactory.newInstance();
    XPath xpath = xpf.newXPath();
    XPathExpression expression = xpath.compile("//A/B[C/E/text()=13]");

    Node b13Node = (Node) expression.evaluate(document, XPathConstants.NODE);
    b13Node.getParentNode().removeChild(b13Node);

    TransformerFactory tf = TransformerFactory.newInstance();
    Transformer t = tf.newTransformer();
    t.transform(new DOMSource(document), new StreamResult(System.out));
}

Answer 1

这个代码片段应该做你想做的事。如果您只想从树中删除 row3 元素，则不必使用(和理解)过于强大的 XPATH!

// -------------- building the document out of the file  -----------------
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document document = dbf.newDocumentBuilder().parse(new File("input.xml"));
//------------------------------------------------------------------------

// -------------- finding the right node and removing it -----------------
Element table = document.getDocumentElement();
Node row3 = table.getElementsByTagName("row3").item(0);
table.removeChild(row3);
//------------------------------------------------------------------------

// -------------- printing the resulting tree to the console -------------
TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();
t.transform(new DOMSource(document), new StreamResult(System.out));
//------------------------------------------------------------------------