Java : Parsing xml file using SAX/XPATH

Question

我有一个 xml 文件，如下所述:

<?xml version="1.0" encoding="UTF-8"?>
<Workbook>
    <ExcelWorkbook
    xmlns="urn:schemas-microsoft-com:office:excel"/>
        <Worksheet ss:Name="Table 1">
            <Table>
                <Row ss:Index="7" ss:AutoFitHeight="0" ss:Height="12">
                <Cell ss:Index="1" ss:StyleID="s05">
                    <ss:Data ss:Type="String"
                        xmlns="http://www.w3.org/TR/REC-html40">
                        <Font html:Size="9" html:Face="Times New Roman" x:Family="Roman" html:Color="#000000">
                        ABCD
                        </Font>
                    </ss:Data>
                </Cell>
            </Row>

如何使用 Java 中的 SAX 或 XPATH 提取数据(此处为“ABCD”)？

编辑1:

这是 XML-

<Table>
<Row ss:Index="74" ss:AutoFitHeight="0" ss:Height="14">
    <Cell ss:Index="1" ss:MergeAcross="3" ss:StyleID="s29">
        <ss:Data ss:Type="Number" xmlns="http://www.w3.org/TR/REC-html40">
        0.00
        </ss:Data>
    </Cell>
    <Cell ss:Index="15" ss:MergeAcross="5" ss:StyleID="s29">
        <ss:Data ss:Type="Number" xmlns="http://www.w3.org/TR/REC-html40">
        4.57
        </ss:Data>
    </Cell>
</Row>

Answer 1

该解决方案假设问题是如何根据行号和列号获取任何单元格的文本。

由于在输入文档中使用了命名空间，我花了一段时间才得到解决方案。显然，如果没有命名空间处理器和一个 hsa 来实现此目的的接口(interface)(没有默认值？)，xpath 就无法解析合格的元素和属性，所以我找到了一种基于映射的实现 here并使用了它。

因此，假设您从源树中的链接中获得了该类，则以下代码将起作用。为了清楚起见，我将搜索模式分解为几个变量

public static String getCellValue(String filename, int rowIdx, int colIdx) {
    // search for Table element anywhere in the source
    String tableElementPattern = "//*[name()='Table']";
    // search for Row element with given number
    String rowPattern = String.format("/*[name()='Row' and @ss:Index='%d']", rowIdx) ;
    // search for Cell element with given column number
    String cellPattern = String.format("/*[name()='Cell' and @ss:Index='%d']", colIdx) ;  
    // search for element that has ss:Type="String" attribute, search for element with text under it and get text name
    String cellStringContent = "/*[@ss:Type='String']/*[text()]/text()";  
    String completePattern = tableElementPattern + rowPattern + cellPattern + cellStringContent;

    try (FileReader reader = new FileReader(filename)) {
        XPath xPath = getXpathProcessor();
        Node n = (Node)xPath.compile(completePattern)
        .evaluate(new InputSource(reader), XPathConstants.NODE);
        if (n.getNodeType() == Node.TEXT_NODE) {
            return n.getNodeValue().trim();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

private static XPath getXpathProcessor() {
    // this is where the custom implementation of NamespaceContext is used
    NamespaceContext context = new NamespaceContextMap(
        "html", "http://www.w3.org/TR/REC-html40", 
        "xsl", "http://www.w3.org/1999/XSL/Transform",
        "o", "urn:schemas-microsoft-com:office:office",
        "x", "urn:schemas-microsoft-com:office:excel",
        "ss", "urn:schemas-microsoft-com:office:spreadsheet");
    XPath xpath =  XPathFactory.newInstance().newXPath();
    xpath.setNamespaceContext(context);
    return xpath;
}

调用:

System.out.println(getCellValue("C://Temp/xx.xml", 7, 1));

产生所需的输出