1)Fetch data from the row of jtable and save it into database:

import javax.swing.*;
import javax.swing.table.*;
import java.sql.*;
import java.awt.*;
import java.awt.event.*;

public class InsertJTableDatabase{
JTable table;
JButton button;
public static void main(String[] args) {
new InsertJTableDatabase();
}

public InsertJTableDatabase(){
JFrame frame = new JFrame("Getting Cell Values in JTable");
JPanel panel = new JPanel();
String data[][] = {{"Angelina","Mumbai"},{"Martina","Delhi"}};

String col[] = {"Name","Address"};
DefaultTableModel model = new DefaultTableModel(data, col);
table = new JTable(model);
JScrollPane pane = new JScrollPane(table);
button=new JButton("Submit");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){
PreparedStatement pstm=null;
ResultSet rs;
int index=1;
int count=table.getRowCount();
try{
 Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");  
for(int i=0;i<count;i++){
Object obj1 = GetData(table, i, 0);
Object obj2 = GetData(table, i, 1);
String value1=obj1.toString();
String value2=obj2.toString();
System.out.println(value1);
System.out.println(value2);

pstm=con.prepareStatement("insert into data values(?,?)");
pstm.setString(1,value1);
pstm.setString(2,value2);

index++;
}
pstm.executeUpdate();
}
catch(Exception e){}
}
});
panel.add(pane);
panel.add(button);
frame.add(panel);
frame.setSize(500,250);
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public Object GetData(JTable table, int row_index, int col_index){
return table.getModel().getValueAt(row_index, col_index);
}
}

2)Fetch data from database table and set the values in a JTable rows:

import java.io.*;
import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;

class JTableDatabase extends JFrame{
    ResultSet rs;
    JTableDatabase(){
    final Vector columnNames = new Vector();
    final Vector data = new Vector();
    JPanel panel=new JPanel();
    try{
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
    Statement st = con.createStatement();
    ResultSet rs= st.executeQuery("Select * from employee");
    ResultSetMetaData md = rs.getMetaData();
    int columns = md.getColumnCount();
    for(int i = 1; i <= columns; i++){
    columnNames.addElement(md.getColumnName(i));
    }
    while(rs.next()){
    Vector row = new Vector(columns);
    for (int i = 1; i <= columns; i++){
    row.addElement(rs.getObject(i));
    }
    data.addElement(row);
    }
   }
catch(Exception e){}
JTable table = new JTable(data, columnNames);
JScrollPane scrollPane = new JScrollPane(table);
panel.add(scrollPane);
add(panel);
}
 public static void main(String arg[])
  {
    try
    {
    JTableDatabase frame=new JTableDatabase();
    frame.setSize(550,200);
    frame.setVisible(true);
    }
  catch(Exception e)
    {}
  }
}

For more information, visit the following link:

Swing Tutorials