我正在尝试解析以下XML文件并基于它创建一个JTree。
<OBJECTS>
<WINDOW NAME = "WINDOW 01" URL = "URL 01">
<PAGE NAME = "PAGE 01" URL = "PAGE URL 01">
</PAGE>
</WINDOW>
</OBJECTS>
“WINDOW 01”将添加到根节点“Object List”,但“PAGE 01”节点未显示在“WINDOW 01”节点下。使用的源代码如下。请帮助!!!
public class DataNode extends DefaultMutableTreeNode {
private static final long serialVersionUID = 1L;
public String ObjectType, ObjectName, URL, ElementType;
public DefaultMutableTreeNode node;
public DataNode(DefaultMutableTreeNode node, Element element) {
this.node = node;
this.ObjectType = element.getTagName();
this.ObjectName = element.getAttribute("NAME");
this.URL = element.getAttribute("URL");
this.ElementType = element.getAttribute("TYPE");
}
public DataNode(Element element) {
this.node = new DefaultMutableTreeNode("OBJECT");
this.ObjectType = element.getTagName();
this.ObjectName = "Object List";
this.URL = "";
this.ElementType = "";
}
@Override
public String toString() {
return this.ObjectName;
}
}
这是主要课程。编译时不会显示错误或警告。
public class MyOwn {
private JFrame contentsFrame;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MyOwn window = new MyOwn();
window.contentsFrame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public MyOwn() {
contentsFrame = new JFrame();
contentsFrame.setTitle("My JTree");
contentsFrame.setBounds(100, 100, 549, 738);
contentsFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTree objectListTree = new JTree(convertXMLtoTree("G:/Collection.xml"));
objectListTree.setAlignmentY(Component.TOP_ALIGNMENT);
objectListTree.setAlignmentX(Component.LEFT_ALIGNMENT);
contentsFrame.getContentPane().add(new JScrollPane(objectListTree));
}
private DefaultMutableTreeNode convertXMLtoTree(String Path) {
NodeList nWindow, nPage;
DefaultMutableTreeNode dRoot, dWindow, dPage;
DataNode xRoot, xWindow, xPage;
try {
File fXmlFile = new File(Path);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
xRoot = new DataNode(doc.getDocumentElement());
dRoot = new DefaultMutableTreeNode(xRoot);
nWindow = doc.getDocumentElement().getElementsByTagName("WINDOW");
for (int i = 0; i < nWindow.getLength(); i++) {
dWindow = new DefaultMutableTreeNode(((Element)(nWindow.item(i))).getAttribute("NAME"));
xWindow = new DataNode(dWindow, (Element)(nWindow.item(i)));
dRoot.add(xWindow);
nPage = ((Element)(nWindow.item(i))).getElementsByTagName("PAGE");
for (int j = 0; j < nPage.getLength(); j++) {
dPage = new DefaultMutableTreeNode(((Element)(nPage.item(j))).getAttribute("NAME"));
xPage = new DataNode(dPage, (Element)(nPage.item(j)));
dWindow.add(xPage);
}
}
return dRoot;
} catch (Exception e) {
return null;
}
}
}
答案 0 :(得分:1)
将自定义DefaultMutableTreeNode
DataNode 添加到WINDOW 01
的子节点,而不是dWindow
永远不会添加到JTree
的{{1}}。取代
dWindow.add(xPage);
带
xWindow.add(xPage);