Java Swing - 如何使用pane.getDocument.insert()在JEditorPane中插入圖像

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import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.text.Element;
import javax.swing.text.StyleConstants;
import javax.swing.text.html.HTML;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
public class Main {
  public static void main(String[] args) throws Exception {
    JFrame frame = new JFrame();
    JEditorPane edPane = new JEditorPane();
    edPane.setContentType("text/html");
    HTMLEditorKit hek = new HTMLEditorKit();
    edPane.setEditorKit(hek);
    HTMLDocument doc = (HTMLDocument) edPane.getDocument();
    doc.insertString(0, "Test testing", null);
    Element[] roots = doc.getRootElements();
    Element body = null;
    for (int i = 0; i < roots[0].getElementCount(); i++) {
      Element element = roots[0].getElement(i);
      if (element.getAttributes().getAttribute(StyleConstants.NameAttribute) == HTML.Tag.BODY) {
        body = element;
        break;
      }
    }
    doc.insertAfterEnd(body,"<img src=" + ClassLoader.getSystemResource("thumbnail.png").toString()
 
 
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