回転-jdbc oracle insert get primary key

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;

public class OracleTest {

    public static void main(String[] args) {
        Connection con = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            con = OracleConnectionFactory.getConnection();
            DatabaseMetaData dmd = con.getMetaData();
            
            System.out.println("database product name: " + dmd.getDatabaseProductName());
            System.out.println("database product version: " + dmd.getDatabaseProductVersion());
            System.out.println("supports generate keys? " + dmd.supportsGetGeneratedKeys());
            
            String sql = "INSERT INTO t_mt_stat (id, mt_time, stat, stat_time) " +
                    "VALUES (s_mt_stat.nextval, ?, ?, ?)";
            
            ps = con.prepareStatement(sql, new String[]{"ID"});  //               
            
            ps.setTimestamp(1, new Timestamp(System.currentTimeMillis()));
            ps.setString(2, "Y");
            ps.setTimestamp(3, new Timestamp(System.currentTimeMillis()));
            ps.executeUpdate();
            
            if(dmd.supportsGetGeneratedKeys()) {
                rs = ps.getGeneratedKeys();
                while(rs.next()) {
                    //      rs.getInt("ID")    ，    Oracle JDBC   ！
                    System.out.println("ID: " + rs.getInt(1));
                }
            }
            
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JdbcUtil.close(rs, ps, con);
        }
    }
}