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Я показываю значение базы данных в JTable, я хотел получить каждое значение строки. Я попробовал addListSelectionListener, но я получаю исключение нулевого указателя ниже, это мой исходный код, где я ошибаюсь.Получение каждого значения строки из JTable
public class mainFrame extends javax.swing.JFrame {
static JTable table;
static Connection connection;
static Statement statement;
static JTable jTable1;
static int count;
static String r;
static DefaultTableModel model;
public mainFrame() {
super();
initComponents();
setLocation(500, 180);
try {
//----------database
final String queryCheck = "SELECT count(*) from test";
final PreparedStatement ps = connection.prepareStatement(queryCheck);
// ps.setString(1, name);
final ResultSet resultSet = ps.executeQuery();
if (resultSet.next()) {
count = resultSet.getInt(1);
System.out.println(count);
}
String read = "select * from test";
ResultSet rs = statement.executeQuery(read);
Object[][] data = new String[count][2];
int i = 0;
while (rs.next()) {
for (int c = 0; c < 2; c++) {
data[i][c] = rs.getString("namexcel");
}
i++;
}
String[] headers = {"Name"};
model = new DefaultTableModel(data, headers);
jTable2.setModel(model);
ListSelectionModel s = jTable2.getSelectionModel();
s.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
s.addListSelectionListener(new RowListener(this));
// pack();
} catch (Exception e) {
}
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() { //..
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try {
String link = jTextField1.getText();
System.out.println("" + link + "");
jTextField1.setText("");
File f = new File("" + link + "");
if (!f.exists()) {
JOptionPane.showMessageDialog(null, "File Doesnt Exist....!!");
mainFrame frame = new mainFrame();
frame.invalidate();
frame.validate();
// frame.revalidate();
} else {
FileInputStream file = new FileInputStream(f);
XSSFWorkbook workbook = new XSSFWorkbook(file);
String name = workbook.getSheetName(0);
System.out.println("----" + name);
final String queryCheck = "SELECT count(*) from test WHERE namexcel = ?";
final PreparedStatement ps = connection.prepareStatement(queryCheck);
ps.setString(1, name);
final ResultSet resultSet = ps.executeQuery();
if (resultSet.next()) {
final int count = resultSet.getInt(1);
if (count == 0) {
JOptionPane.showMessageDialog(null, "thank you");
statement.executeUpdate("insert into test (namexcel) values('" + name + "')");
DefaultTableModel model = (DefaultTableModel) jTable2.getModel();
Vector newRow = new Vector();
newRow.add(name);
Object[][] data1 = {{name},};
model.addRow(newRow);
} else {
JOptionPane.showMessageDialog(null, "Name Already exist please select diffrent name of excel");
}
}
}
} catch (Exception r) {
}
}
public static void main(String args[]) throws Exception {
Class.forName("org.sqlite.JDBC");
connection = null;
connection = DriverManager.getConnection("jdbc:sqlite:excel.db");
statement = connection.createStatement();
statement.executeUpdate("CREATE TABLE IF NOT EXISTS test (id INTEGER PRIMARY KEY , namexcel string)");
}
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
public static javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable2;
private javax.swing.JTextField jTextField1;
}
class RowListener implements ListSelectionListener {
mainFrame readRow;
JTable table;
public RowListener(mainFrame rar) {
readRow = rar;
table = readRow.table;
}
public void valueChanged(ListSelectionEvent e) {
if (!e.getValueIsAdjusting()) {
ListSelectionModel model = table.getSelectionModel();
int lead = model.getLeadSelectionIndex();
displayRowValues(lead);
}
}
private void displayRowValues(int rowIndex) {
int columns = table.getColumnCount();
String s = "";
for (int col = 0; col < columns; col++) {
Object o = table.getValueAt(rowIndex, col);
s += o.toString();
if (col < columns - 1) {
s += ", ";
}
}
System.out.println(s);
}
}