Getting Primary key and Foreign Key Relations from a Database Java

This code is used to Retrieve primary key and foreign key relations between all tables in a Database, code tested with SQL Server, output will be stored in MetaData.dat 
Format of the O/P file will be

PrimaryKeyTable.ColumnName~ForignKeyTable.ColumnName~~ForignKeyTable.ColumnName

import java.io.BufferedWriter;

import java.io.FileWriter;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DatabaseMetaData;

import java.sql.ResultSet;

import java.sql.SQLException;

public class clsKeys {

       public static void main(String args[]) {

              subGetKeys();

       }

       public static void subGetKeys() {

             

              String strRow;

              try {

                     jdbc objJDBC = new jdbc();

                     Connection con = objJDBC.getConnection();

                    

              /*     jdbc is a class that i have created for my database connections

                     u can alternately use

                      String url = "jdbc:mysql://localhost:3306/";

                      String dbName = "jdbctutorial";

                      String driver = "com.mysql.jdbc.Driver";

                      String userName = "root";

                      String password = "root";

                      

                      Class.forName(driver).newInstance();

                      conn = DriverManager.getConnection(url+dbName,userName,password);*/

                     ResultSet rsKeys;

                     DatabaseMetaData meta = con.getMetaData();

                     String[] TABLE_TYPES = { "TABLE" };

                     ResultSet tables = meta.getTables(null, null, null, TABLE_TYPES);

                     FileWriter fstream = new FileWriter("MetaData.dat");

                     BufferedWriter out = new BufferedWriter(fstream);

                    

                     while (tables.next()) {

                         

                           rsKeys = meta.getExportedKeys(con.getCatalog(), null, tables

                                         .getString("TABLE_NAME"));

                           strRow = subGenerateRow(rsKeys);

                           System.out.println(strRow);

                         

                             if(strRow.length()>0)

                            {

                                   out.write(strRow);

                                   out.newLine();

                            }

                     }

                     out.close();

              } catch (SQLException e) {

                   

                     e.printStackTrace();

              } catch (IOException e) {

                   

                     e.printStackTrace();

              }

       }

       public static String subGenerateRow(ResultSet rs) throws SQLException {

              String strRow = "";

              int intCounter = 0;

              while (rs.next()) {

                     if (intCounter == 0) {

                           strRow += rs.getString("PKTABLE_NAME");

                           strRow += ".";

                           strRow += rs.getString("PKCOLUMN_NAME");

                           strRow += "~";

                     }

                     strRow += rs.getString("FKTABLE_NAME");

                     strRow += ".";

                     strRow += rs.getString("FKCOLUMN_NAME");

                     strRow += "~";

                     intCounter++;

              }

              if (strRow.length() > 1) {

                     strRow=strRow.substring(0, strRow.length() - 1);

              }

              return strRow;

       }

}