Java中xml文件的解析

        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>jaxen</groupId>
            <artifactId>jaxen</artifactId>
            <version>1.1.6</version>
        </dependency>

   /**
     * 将输入流解析成Document
     * @param inputStream
     * @return
     * @throws DocumentException
     */
    public static Document parse(InputStream inputStream) {
        Document document = null;
        try {
            SAXReader saxReader = new SAXReader();
            document = saxReader.read(inputStream);
        } catch (DocumentException e) {
            throw new BusinessException("parse file exception:",e);
        }
        return document;
    }

    /**
     * 根据xpath表达式获取Document中所有的节点元素
     * @param document
     * @param xpathExp
     * @return
     */
    public static List<Element> getNodes(Document document, String xpathExp) {
        return document.selectNodes(xpathExp);
    }

    /**
     * 根据xpath表达式获取Document中所有对应节点的值
     *
     * @param document
     * @param xpathExp
     * @return
     * @throws DocumentException
     */
    public static List<String> getNodeValues(Document document, String xpathExp) {
        List<Element> elements = document.selectNodes(xpathExp);
        List<String> nodeValues = new ArrayList<>(elements.size());
        for (Element element : elements) {
            nodeValues.add(element.getText());
        }
        return nodeValues;
    }

    /**
     * 根据xpath表达式获取Document中对应节点的值
     *
     * @param document
     * @param xpathExp
     * @return
     * @throws DocumentException
     */
    public static String getNodeValue(Document document, String xpathExp) {
        List<Element> elements = document.selectNodes(xpathExp);
        if(CollectionUtils.isEmpty(elements)){
            return null;
        }
        return elements.get(0).getText();
    }