用 jformdesigner 画出来的 RsyntaxTextArea 无法正确显示行数

我用 jformdesigner 设计了一个界面，并且开启了显示行数，当前 ui 也有行数显示，如下 但是在我运行起来之后就没有行数显示了 刚开始以为是 Flat 皮肤和 Mig 布局问题 但是我使用官方 demo 进行测试时候发现是可以显示行数的。

所以我不知道怎么解决这个问题了。找遍全网也没有类似的问题，

测试代码:

 import java.awt.*; import java.awt.event.*; import javax.swing.*; import net.miginfocom.swing.*; import org.fife.ui.rsyntaxtextarea.*; import org.fife.ui.rtextarea.*; /** * @author unknown */ public class Database extends JFrame { public Database() { initComponents(); } private void createUIComponents() { // TODO: add custom component creation code here } private void commonSql(ActionEvent e) { if(leftSplitPane.getDividerLocation() == 0){ leftSplitPane.setDividerLocation(180); }else { leftSplitPane.setDividerLocation(0); } } private void initComponents() { // JFormDesigner - Component initialization - DO NOT MODIFY //GEN-BEGIN:initComponents leftSplitPane = new JSplitPane(); scrollPane1 = new JScrollPane(); commOnSQLStatementslLst= new JList(); splitPane2 = new JSplitPane(); panel1 = new JPanel(); rTextScrollPane1 = new RTextScrollPane(); sqlTextArea = new RSyntaxTextArea(); label1 = new JLabel(); encodeComboBox = new JComboBox<>(); runSqlButton = new JButton(); commOnSqlButton= new JButton(); scrollPane2 = new JScrollPane(); sqlResutlTable = new JTable(); //======== this ======== Container cOntentPane= getContentPane(); contentPane.setLayout(new CardLayout()); //======== leftSplitPane ======== { leftSplitPane.setDividerLocation(0); //======== scrollPane1 ======== { scrollPane1.setViewportView(commonSQLStatementslLst); } leftSplitPane.setLeftComponent(scrollPane1); //======== splitPane2 ======== { splitPane2.setOrientation(JSplitPane.VERTICAL_SPLIT); splitPane2.setDividerLocation(160); //======== panel1 ======== { panel1.setLayout(new MigLayout( "insets 0,hidemode 3", // columns "[fill]" + "[fill]" + "fill]" + "[fill]" + "[grow,fill]", // rows "[grow,fill]" + "[]")); //======== rTextScrollPane1 ======== { rTextScrollPane1.setLineNumbersEnabled(true); //---- sqlTextArea ---- sqlTextArea.setParserDelay(0); sqlTextArea.setSyntaxEditingStyle("text/sql"); rTextScrollPane1.setViewportView(sqlTextArea); } panel1.add(rTextScrollPane1, "cell 0 0 5 1"); //---- label1 ---- label1.setText("\u7f16\u7801:"); panel1.add(label1, "cell 0 1"); //---- encodeComboBox ---- encodeComboBox.setModel(new DefaultComboBoxModel<>(new String[] { "UTF-8", "GBK", "" })); panel1.add(encodeComboBox, "cell 1 1"); //---- runSqlButton ---- runSqlButton.setText("\u8fd0\u884c"); panel1.add(runSqlButton, "cell 2 1"); //---- commonSqlButton ---- commonSqlButton.setText("\u5e38\u7528SQL\u8bed\u53e5"); commonSqlButton.addActionListener(e -> commonSql(e)); panel1.add(commonSqlButton, "cell 3 1"); } splitPane2.setTopComponent(panel1); //======== scrollPane2 ======== { scrollPane2.setViewportView(sqlResutlTable); } splitPane2.setBottomComponent(scrollPane2); } leftSplitPane.setRightComponent(splitPane2); } contentPane.add(leftSplitPane, "card1"); pack(); setLocationRelativeTo(getOwner()); // JFormDesigner - End of component initialization //GEN-END:initComponents } // JFormDesigner - Variables declaration - DO NOT MODIFY //GEN-BEGIN:variables private JSplitPane leftSplitPane; private JScrollPane scrollPane1; private JList commonSQLStatementslLst; private JSplitPane splitPane2; private JPanel panel1; private RTextScrollPane rTextScrollPane1; private RSyntaxTextArea sqlTextArea; private JLabel label1; private JComboBox<String> encodeComboBox; private JButton runSqlButton; private JButton commonSqlButton; private JScrollPane scrollPane2; private JTable sqlResutlTable; // JFormDesigner - End of variables declaration //GEN-END:variables public static void main(String[] args) { new Database().setVisible(true); } } 

希望各位大佬能够帮忙看看是怎么回事。这事困扰我好久了