Question

我想把JEditorPane放在JTable单元格中。我写了这个：

jTabel1.setDefaultRenderer(String.class, new StringEditorPane());
.........
class StringEditorPane extends JEditorPane
    implements TableCellRenderer {

public StringEditorPane() {
    setContentType("text/html");
}



 public Component getTableCellRendererComponent(
            JTable table, Object styledString,
            boolean isSelected, boolean hasFocus,
            int row, int column) {
        if (isSelected) {
            String styledText = (String) styledString;
            setText(styledText);
            setBackground(getSelectionColor());
            return this;
        } else {
            String styledText = (String) styledString;
            setText(styledText);
            setBackground(Color.white);
            return this;
        }
    }
}

我可以编译它并显示JEditorPane，但它也会抛出异常，我不知道为什么。

例外：

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at javax.swing.text.DefaultStyledDocument.getParagraphElement(DefaultStyledDocument.java:445)
    at javax.swing.text.StyledEditorKit$AttributeTracker.updateInputAttributes(StyledEditorKit.java:223)
    at javax.swing.text.StyledEditorKit$AttributeTracker.caretUpdate(StyledEditorKit.java:258)
    at javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:391)
    at javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent.java:4387)
    at javax.swing.text.JTextComponent$MutableCaretEvent.stateChanged(JTextComponent.java:4409)
    at javax.swing.text.DefaultCaret.fireStateChanged(DefaultCaret.java:782)
    at javax.swing.text.DefaultCaret.changeCaretPosition(DefaultCaret.java:1257)
    at javax.swing.text.DefaultCaret.handleSetDot(DefaultCaret.java:1153)
    at javax.swing.text.DefaultCaret.setDot(DefaultCaret.java:1134)
    at javax.swing.text.DefaultCaret$Handler.removeUpdate(DefaultCaret.java:1777)
    at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:243)
    at javax.swing.text.AbstractDocument.handleRemove(AbstractDocument.java:608)
    at javax.swing.text.AbstractDocument.remove(AbstractDocument.java:576)
    at javax.swing.JEditorPane.setText(JEditorPane.java:1493)
    at myProject.StringEditorPane.getTableCellRendererComponent(MainWindow.java:136)
    at javax.swing.JTable.prepareRenderer(JTable.java:5720)
........

来自MainWindow.java的136行：

setText(styledText);

来自getTableCellRendererComponent函数的

。

Answer 1

似乎从删除旧内容中抛出了崩溃。尝试使用新实例替换文档。在setText（）调用之前

setDocument(getEditorKit().createDefaultDocument());

Answer 2

您似乎需要为null变量处理styledText值。

Answer 3

不确定为什么需要自定义渲染器。 String类的默认渲染器是JLabel，JLabel支持HTML。

如何将JEditorPane插入JTable单元格？

3 个答案: