xml到jtree在java中的解析

Question

我有一个以下 xml，具有多个级别（级别 1、级别 2、级别 3）。 所有级别 1 都将进入如图所示的选项卡。

<?xml version="1.0" encoding="UTF-8"?>
<treeNode label="projectTags" level="0">
    <reference/>
    <treeNode label="category" level="1">
        <reference>
            <dataField name="category_id" value="2"/>
            <dataField name="labelFieldValue" value="IRIS"/>
            <dataField name="category" value="IRIS"/>
            <dataField name="labelFieldName" value="Category"/>
            <dataField name="idFieldName" value="category_id"/>
            <dataField name="idFieldValue" value="2"/>
        </reference>
        <treeNode label="project" level="2">
            <reference>
                <dataField name="category_id" value="2"/>
                <dataField name="projectvisible" value="1"/>
                <dataField name="project" value="Acenaphthene"/>
                <dataField name="labelFieldValue" value="Acenaphthene"/>
                <dataField name="labelFieldName" value="Project"/>
                <dataField name="projectactive" value="1"/>
                <dataField name="idFieldName" value="Project_id"/>
                <dataField name="idFieldValue" value="1436"/>
                <dataField name="project_id" value="1436"/>
                <dataField name="casrn" value="83-32-9"/>
            </reference>
        </treeNode>
        <treeNode label="project" level="2">
            <reference>
                <dataField name="category_id" value="2"/>
                <dataField name="projectvisible" value="1"/>
                <dataField name="project" value="Acetaldehyde"/>
                <dataField name="labelFieldValue" value="Acetaldehyde"/>
                <dataField name="labelFieldName" value="Project"/>
                <dataField name="projectactive" value="1"/>
                <dataField name="idFieldName" value="Project_id"/>
                <dataField name="idFieldValue" value="37"/>
                <dataField name="project_id" value="37"/>
                <dataField name="casrn" value="75-07-0"/>
            </reference>
            <treeNode label="usage" level="3">
                <reference>
                    <dataField name="usageVisible" value="1"/>
                    <dataField name="labelFieldValue" value="1991 IRIS"/>
                    <dataField name="usage_id" value="1158"/>
                    <dataField name="usageActive" value="1"/>
                    <dataField name="parent_usage" value=""/>
                    <dataField name="projectActive" value="1"/>
                    <dataField name="parent_usage_id" value=""/>
                    <dataField name="idFieldName" value="usage_id"/>
                    <dataField name="projectVisible" value="1"/>
                    <dataField name="isdefault" value="0"/>
                    <dataField name="usage" value="1991 IRIS"/>
                    <dataField name="description" value=""/>
                    <dataField name="labelFieldName" value="usage"/>
                    <dataField name="idFieldValue" value="1158"/>
                    <dataField name="project_id" value="37"/>
                </reference>
            </treeNode>
        </treeNode>
    </treeNode>
    <treeNode label="category" level="1">
            <reference>
                <dataField name="category_id" value="1"/>
                <dataField name="labelFieldValue" value="NAAQS"/>
                <dataField name="category" value="NAAQS"/>
                <dataField name="labelFieldName" value="Category"/>
                <dataField name="idFieldName" value="category_id"/>
                <dataField name="idFieldValue" value="1"/>
            </reference>
            <treeNode label="project" level="2">
                <reference>
                    <dataField name="category_id" value="1"/>
                    <dataField name="projectvisible" value="1"/>
                    <dataField name="project" value="Aquatic Acidification"/>
                    <dataField name="labelFieldValue" value="Aquatic Acidification"/>
                    <dataField name="labelFieldName" value="Project"/>
                    <dataField name="projectactive" value="1"/>
                    <dataField name="idFieldName" value="Project_id"/>
                    <dataField name="idFieldValue" value="1576"/>
                    <dataField name="project_id" value="1576"/>
                    <dataField name="casrn" value=""/>
                </reference>
                <treeNode label="usage" level="3">
                    <reference>
                        <dataField name="usageVisible" value="1"/>
                        <dataField name="labelFieldValue" value="All refs"/>
                        <dataField name="usage_id" value="651"/>
                        <dataField name="usageActive" value="1"/>
                        <dataField name="parent_usage" value=""/>
                        <dataField name="projectActive" value="1"/>
                        <dataField name="parent_usage_id" value=""/>
                        <dataField name="idFieldName" value="usage_id"/>
                        <dataField name="projectVisible" value="1"/>
                        <dataField name="isdefault" value="0"/>
                        <dataField name="usage" value="All refs"/>
                        <dataField name="description" value=""/>
                        <dataField name="labelFieldName" value="usage"/>
                        <dataField name="idFieldValue" value="651"/>
                        <dataField name="project_id" value="1576"/>
                    </reference>
                    <treeNode label="usage" level="4">
                        <reference>
                            <dataField name="usageVisible" value="1"/>
                            <dataField name="labelFieldValue" value="Hydrology"/>
                            <dataField name="usage_id" value="652"/>
                            <dataField name="usageActive" value="1"/>
                            <dataField name="parent_usage" value="All refs"/>
                            <dataField name="projectActive" value="1"/>
                            <dataField name="parent_usage_id" value="651"/>
                            <dataField name="idFieldName" value="usage_id"/>
                            <dataField name="projectVisible" value="1"/>
                            <dataField name="isdefault" value="0"/>
                            <dataField name="usage" value="Hydrology"/>
                            <dataField name="description" value=""/>
                            <dataField name="labelFieldName" value="usage"/>
                            <dataField name="idFieldValue" value="652"/>
                            <dataField name="project_id" value="1576"/>
                        </reference>
                    </treeNode>
                </treeNode>
            </treeNode>
        </treeNode>
    </treeNode>

我需要把它解析成 JTree，让它看起来像

我正在使用以下代码，

private DefaultMutableTreeNode buildTreeNode(Node rootNode)
        {
            DefaultMutableTreeNode treeNode = new DefaultMutableTreeNode(rootNode.getNodeName());

            System.out.println("root\t" + rootNode.getNodeName() + "\t" + rootNode.getNodeValue());
            if (rootNode.hasAttributes())
            {
                NamedNodeMap attributes = rootNode.getAttributes();

            if (attributes.item(0).toString().contains("labelFieldValue"))
            {
                System.out.println(attributes.item(0).toString() + "\t" + attributes.item(1).toString());
                String attr = attributes.item(1).toString();
                treeNode.add(new DefaultMutableTreeNode("@" + attr));
            }
        }

        if (rootNode.hasChildNodes())

        {
            NodeList children = rootNode.getChildNodes();

            for (int i = 0; i < children.getLength(); i++)
            {
                Node node = children.item(i);
                short nodeType = node.getNodeType();

                if (nodeType == Node.ELEMENT_NODE)
                {
                    treeNode.add(buildTreeNode(node));
                }
                else if (nodeType == Node.TEXT_NODE)
                {
                    String text = node.getTextContent().trim();
                    if (!text.equals(""))
                        treeNode.add(new DefaultMutableTreeNode(text));

                }
            }
        }
        return treeNode;
    }

但我得到了关注

我该如何解决？ 我只需要显示“labelFieldValue”下的值，而不是所有的值。

Answer 1

public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    File f = new File("Elements2.xml");
    Document d = builder.parse(f);
    Node node = d.getDocumentElement();
    DefaultMutableTreeNode parent = new DefaultMutableTreeNode();
    parent = buildTreeNode(parent, node);
    final DefaultMutableTreeNode finalnode = parent;

    javax.swing.SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            createAndShowGUI(finalnode);
        }
    });

}

private static void createAndShowGUI(DefaultMutableTreeNode parent) {
    final JFrame frame = new JFrame("Split Pane Example");
    // Display the window.
    frame.setSize(500, 300);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // set grid layout for the frame
    frame.getContentPane().setLayout(new GridLayout(1, 1));

    JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
    tabbedPane.addTab("IRIS", makePanel("IRIS", parent, 0));
    tabbedPane.addTab("NAAQS", makePanel("NAAQS", parent, 1));
    frame.getContentPane().add(tabbedPane);
}

private static JPanel makePanel(String text, DefaultMutableTreeNode parent, int i) {
    JPanel p = new JPanel();
    //p.add(new Label(text));
    p.setLayout(new GridLayout(1, 1));
    JTree jtree = new JTree(parent.getChildAt(i));
    JScrollPane sp = new JScrollPane(jtree);
    p.add(sp);
    return p;
}

private static boolean specialCase = false;
private static DefaultMutableTreeNode buildTreeNode(DefaultMutableTreeNode parent, Node parentNode) {
    DefaultMutableTreeNode currentLevel = null;
    if (parentNode.getNodeName().equals("treeNode")) {
        NodeList children = parentNode.getChildNodes();
        for (int i = 0; i < children.getLength(); i++) {
            Node node = children.item(i);
            if (node.getNodeName().equals("reference") && !node.hasChildNodes()) {
                currentLevel = new DefaultMutableTreeNode("root");
                specialCase = true;

            } else if (node.getNodeName().equals("reference") && node.hasChildNodes()) {
                NodeList dataFields = node.getChildNodes();
                for (int j = 0; j < dataFields.getLength(); j++) {
                    Node dataField = dataFields.item(j);
                    NamedNodeMap attributes = dataField.getAttributes();
                    if (attributes != null && attributes.item(0).toString().contains("labelFieldValue")) {
                        String attr = attributes.item(1).toString();
                        currentLevel = new DefaultMutableTreeNode("@"+attr);
                        parent.add(currentLevel);
                        break;
                    }                   
                }
            } else if (node.getNodeName().equals("treeNode") && node.hasChildNodes() && specialCase) {
                specialCase = false;
                parent = buildTreeNode(currentLevel, node);
            } else if (node.getNodeName().equals("treeNode") && node.hasChildNodes() && !specialCase) {
                currentLevel = buildTreeNode(currentLevel, node);
            }
        }
    }
    return parent;
}