xml解析为实体类方法

public static List<SheetDetail> parse(String xml) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.parse(new InputSource(new StringReader(xml)));
            Node rootNode = null;
            for (Node node = doc.getFirstChild(); node != null; node = node.getNextSibling()) {
                if (node.getNodeType() == Node.ELEMENT_NODE && "opDetail".equals(node.getNodeName())) {
                    rootNode = node;
                    break;
                }
            }
            if (rootNode == null) {
                return null;
            }

            List<SheetDetail> list = new ArrayList<SheetDetail>();
            for (Node node = rootNode.getFirstChild(); node != null; node = node.getNextSibling()) {
                if (node.getNodeType() == Node.ELEMENT_NODE && "recordInfo".equals(node.getNodeName())) {
                    SheetDetail sheet = parseRecordNode(node);
                    list.add(sheet);
                }
            }

            return list;

        } catch (Exception e) {
            logger.error("", e);
            return null;
        }
    }

SheetDetail为实体类。