<java>save pdf in postgres and get sample

package homeWork;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;


public class savePdf {
	
	private static final String URL_STR="jdbc:postgresql://localhost:5432/prototype";
	private static final String DRIVER_STR="org.postgresql.Driver";
	
	
	public static void main(String[] args) throws FileNotFoundException, Exception, SQLException {
		
		//new file
		File file = new File("/Users/tk/input.pdf");
		FileInputStream fis = new FileInputStream(file);		
		savePdf sv = new savePdf();
		
		//save
		int retCode1 = sv.savePdf(file,fis);
		
		//get
		@SuppressWarnings("unused")
		int retCode2 = sv.getPdf(0);
				
	}
	
	/**
	 * PDF save
	 * @param file
	 * @param pdf
	 * @return
	 * @throws ClassNotFoundException
	 * @throws SQLException
	 * @throws Exception
	 */
	@SuppressWarnings("unused")
	private int savePdf(File file,FileInputStream pdf) throws ClassNotFoundException, SQLException, Exception {
		
		Connection conn = null;

        //conn string
        String url = URL_STR;
        String user = "tk";
        String password = "";
        Class.forName(DRIVER_STR);
         //connect PostgreSQL
         conn = DriverManager.getConnection(url, user, password);
         
         PreparedStatement ps = conn.prepareStatement("INSERT INTO storedPdf VALUES (?, ?, ?)");
         ps.setInt(1, 0);
         ps.setString(2, "samplefile");
         ps.setBinaryStream(3, pdf, (int)file.length());
         
         ps.executeUpdate();
         ps.close();
         pdf.close();
		
		return 0;
	}
	
	/**
	 * 
	 * @param key
	 * @return
	 * @throws Exception
	 */
	private int getPdf(int key) throws Exception {
		
		Connection conn = null;

        //conn string
        String url = URL_STR;
        String user = "tk";
        String password = "";
        Class.forName(DRIVER_STR);
         //conn PostgreSQL
         conn = DriverManager.getConnection(url, user, password);
         PreparedStatement ps = conn.prepareStatement("SELECT pdf FROM storedPdf WHERE id = ?");
         ps.setInt(1, 0);
         ResultSet rs = ps.executeQuery();
         FileOutputStream fos = new FileOutputStream("/Users/tk/output.pdf");

         while (rs.next())
         {
        	 byte[] imgBytes = rs.getBytes(1);

             fos.write(imgBytes, 0, imgBytes.length);
         }         
         rs.close();
         ps.close();

	return 0;
	}
	
}