Convert .xls into .txt

The following java program is intended to convert .xls file into .txt file. This is simple java program which uses only java API.

import java.sql.*;
import java.util.*;
import java.io.*;

public class DataConversion
{
public static void main(String[] ak)
{
FileOutputStream fos;
PrintStream p;
try{
//String query="Select * from CCAPS_APP_REJECT_REASONS where rownum<='100'";
String query="SELECT * FROM [Sheet1$]";
//Class.forName("oracle.jdbc.driver.OracleDriver");
//Connection con = DriverManager.getConnection("jdbc:oracle:thin:@10.94.191.142:1521:testdata", "user", "password");

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:XLDSN","","");
Statement st=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet rst=st.executeQuery(query);

fos= new FileOutputStream("myfile.txt");
p=new PrintStream(fos);

ResultSetMetaData rsmd = rst.getMetaData();
int Columns = rsmd.getColumnCount();

while(rst.next())
{

for(int i=1;i<=Columns;i++)
{

if((rst.getString(i))==null)
{
p.print("\"\",");
/*if(i==15)
{
for(int j=1;j<16;j++)
{
p.print(",\"\"");
}
}
else if(i==16)
{

for(int j=1;j<4;j++)
{
p.print(",\"\"");
}
}*/

}

else
{
p.print("\""+rst.getString(i)+"\""+",");


}
}
p.println("\n");
}




//p.println("No. of column="+Columns);
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
}

To run this program simply copy and paste on any location, create DSN by name 'XLDSN', create an excel file with some entry, compile the java file and run.