DOCXMergeEngine.java 文件源码

private int getMaxRId(ByteArrayOutputStream xmlStream) throws ParserConfigurationException, SAXException, IOException, XPathExpressionException {

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.parse(new ByteArrayInputStream(xmlStream.toByteArray()));
        XPathFactory xPathfactory = XPathFactory.newInstance();
        XPath xpath = xPathfactory.newXPath();
        XPathExpression expr = xpath.compile("Relationships/*");
        NodeList nodeList = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
        for (int i = 0; i < nodeList.getLength(); i++) {
            String id = nodeList.item(i).getAttributes().getNamedItem("Id").getTextContent();
            int idNum = Integer.parseInt(id.substring("rId".length()));
            this.maxRId = idNum > this.maxRId ? idNum : this.maxRId;
        }
        return this.maxRId;
    }