xml的读取(sax)

读取xml：

    Document document = XmlUtil.getDocument( filePath );

    public static Document getDocument( String filePath ) throws ParserConfigurationException, SAXException,
            IOException {

        // 需要添加判断参数为空操作

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        builder = factory.newDocumentBuilder();

        return builder.parse( new File( filePath ) );
    }

   

读取单个节点：

    public static Node getSingleNode( Node contextNode, String xPath ) throws TransformerException,
            XPathExpressionException {

        // 需要添加判断参数为空操作

        XPathFactory factory = XPathFactory.newInstance();
        XPath path = factory.newXPath();

        NodeList nodeList = (NodeList) path.evaluate( xPath, contextNode, XPathConstants.NODESET );

        return nodeList.item( 0 );
    }

读取单个节点list：

NodeList groupingList = XmlUtil.getNodeList( document, "//xml根节点/page[@id='" + pageNo+ "']/grouping" );

每一层节点都可以用[@属性key='属性值']的形式传入属性参数来读取。

    public static NodeList getNodeList( Node contextNode, String xPath ) throws XPathExpressionException,
            ParserConfigurationException, SAXException, IOException, TransformerException {

        // 需要添加判断参数为空操作

        XPathFactory factory = XPathFactory.newInstance();
        XPath path = factory.newXPath();

        NodeList nodeList = (NodeList) path.evaluate( xPath, contextNode, XPathConstants.NODESET );

        return nodeList;
    }

从指定node取得属性：

    Node rowNode = nodeList.item( i );
    String rowNo = XmlUtil.getAttribute( rowNode, "row" );

    public static String getAttribute( Node contextNode, String attributeName ) {

        // 需要添加判断参数为空操作

        String target = attributeName.toUpperCase();

        NamedNodeMap attributes = contextNode.getAttributes();

        for ( int i = 0; i < attributes.getLength(); i++ ) {
            if ( target.equals( attributes.item( i ).getNodeName().toUpperCase() ) ) {
                return attributes.item( i ).getNodeValue();
            }
        }

        return null;
    }

从节点list取得标签内text内容：

    public static String getTextContentsByName( NodeList nodeList, String nodeName ) {

        // 需要添加判断参数为空操作

        String textContents = StringUtil.EMPTY;

        for ( int i = 0; i < nodeList.getLength(); i++ ) {
            Node node = nodeList.item( i );
            if ( node.getNodeName().equals( nodeName ) ) {
                textContents = node.getTextContent();
                break;
            }
        }

        return textContents;
    }