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JTextPane textPane = ...;
StyledDocument document = (StyledDocument) textPane.getDocument();
SimpleAttributeSet attribSet = new SimpleAttributeSet();
StyleConstants.setForeground(attribSet, Color.RED);
StyleConstants.setUnderline(attribSet,true);
// 某个错误的位置和长度
int begin = ...;
int offset = ...;
document.setCharacterAttributes(begin,offset,attribSet,false);