Java - JList値の変更時にDBからテキストファイルへのインポート

Question

JListボックス内の特定の値をクリックすると、データベースからjTextFileldsに値をインポートしようとしています.Jlistから選択した値を取得して使用します。選択ステートメントを使用してデータベースから値を取得する。 実際に働いているのは、私の割り当てのアドレス帳です。 Plz help me out !!問題は、あなたが新しいDefaultListModelを作成して、そこから何かを取得しようとしているということです

おかげで、事前に

private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt)          
      // String lfn = evt.toString(); 
    DefaultListModel listModel = new DefaultListModel(); 
    jList1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); 
    String sel = listModel.get(jList1.getSelectedIndex()).toString(); 
    try { 
     Connection con = DriverManager.getConnection("jdbc:oracle:thin:@//localhost:1521/XE ", "system", "sruthi"); 
     Statement stmt = con.createStatement(); 
     ResultSet rs = null; 
     //String sql = "select FNAME,LNAME,EMAIL,CITY,STATE,PNUM from PERSON where FNAME=lfn"; 
     jList1.setSelectedIndex(0); 

     rs = stmt.executeQuery("select FNAME,LNAME,EMAIL,CITY,STATE,PNUM from PERSON where FNAME='%"+sel+ "%'"); 

     String fn = rs.getString("FNAME"); 
     String ln = rs.getString("LNAME"); 
     String em = rs.getString("EMAIL"); 
     String ct = rs.getString("CITY"); 
     String st = rs.getString("STATE"); 
     int no =Integer.parseInt(rs.getString("PNUM")); 

     jTextField1.setText(fn); 
     jTextField2.setText(em); 
     jTextField3.setText(String.valueOf(no)); 
     jTextField4.setText(ct); 
     jTextField5.setText(st); 
     jTextField7.setText(ln); 


    } catch (SQLException ex) { 
     Logger.getLogger(addbook.class.getName()).log(Level.SEVERE, null, ex); 
} 

エラー:::

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0 
    at java.util.Vector.elementAt(Vector.java:427) 
    at javax.swing.DefaultListModel.get(DefaultListModel.java:428) 
    at project2.addbook.jList1ValueChanged(addbook.java:356) 
    at project2.addbook.access$000(addbook.java:18) 
    at project2.addbook$1.valueChanged(addbook.java:108) 
    at javax.swing.JList.fireSelectionValueChanged(JList.java:1765) 
    at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1779) 
    at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167) 
    at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147) 
    at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194) 
    at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388) 
    at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398) 
    at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:442) 
    at javax.swing.JList.setSelectionInterval(JList.java:2035) 
    at javax.swing.plaf.basic.BasicListUI$Handler.adjustSelection(BasicListUI.java:2727) 
    at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(BasicListUI.java:2683) 
    at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263) 
    at java.awt.Component.processMouseEvent(Component.java:6264) 
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) 
    at java.awt.Component.processEvent(Component.java:6032) 
    at java.awt.Container.processEvent(Container.java:2041) 
    at java.awt.Component.dispatchEventImpl(Component.java:4630) 
    at java.awt.Container.dispatchEventImpl(Container.java:2099) 
    at java.awt.Component.dispatchEvent(Component.java:4460) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) 
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4235) 
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) 
    at java.awt.Container.dispatchEventImpl(Container.java:2085) 
    at java.awt.Window.dispatchEventImpl(Window.java:2478) 
    at java.awt.Component.dispatchEvent(Component.java:4460) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) 
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0 
    at java.util.Vector.elementAt(Vector.java:427) 
    at javax.swing.DefaultListModel.get(DefaultListModel.java:428) 
    at project2.addbook.jList1ValueChanged(addbook.java:356) 
    at project2.addbook.access$000(addbook.java:18) 
    at project2.addbook$1.valueChanged(addbook.java:108) 
    at javax.swing.JList.fireSelectionValueChanged(JList.java:1765) 
    at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1779) 
    at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167) 
    at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:137) 
    at javax.swing.DefaultListSelectionModel.setValueIsAdjusting(DefaultListSelectionModel.java:668) 
    at javax.swing.JList.setValueIsAdjusting(JList.java:2110) 
    at javax.swing.plaf.basic.BasicListUI$Handler.mouseReleased(BasicListUI.java:2784) 
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273) 
    at java.awt.Component.processMouseEvent(Component.java:6267) 
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) 
    at java.awt.Component.processEvent(Component.java:6032) 
    at java.awt.Container.processEvent(Container.java:2041) 
    at java.awt.Component.dispatchEventImpl(Component.java:4630) 
    at java.awt.Container.dispatchEventImpl(Container.java:2099) 
    at java.awt.Component.dispatchEvent(Component.java:4460) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) 
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) 
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) 
    at java.awt.Container.dispatchEventImpl(Container.java:2085) 
    at java.awt.Window.dispatchEventImpl(Window.java:2478) 
    at java.awt.Component.dispatchEvent(Component.java:4460) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) 

Answer 1

（作成されたばかりなので、何も表示されません）。代わりに、jlist1.getSelectedValue()に電話するだけです。