java image store in database

Connection class
public class DBConnection {
public Connection conn=null;
     void getConnection()
    {
         try {
             Class.forName("com.mysql.jdbc.Driver");
             }
         catch (ClassNotFoundException ex)
         {

         }
         try {

              conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/ImageProcessing", "root","root");
             } catch (Exception ex)
             {

             }
    }
}

public class DataBase {
	 static String strDB;
	
	public DataBase(String str) throws SQLException
	
	{
		DBConnection obj = new DBConnection();
		obj.getConnection();
		String str1=str;
		
		PreparedStatement pstmt = obj.conn
				.prepareStatement("insert into imagestore (ImagePath,row) values(?,?)");
		int i=1;
		pstmt.setString(1, str1);
		pstmt.setInt(2,i );
		pstmt.executeUpdate();
		
		Statement stmt = obj.conn.createStatement();
	      String query = "SELECT ImagePath FROM ImageStore where row=1";
	      ResultSet rs =  stmt.executeQuery(query);
	  
	      while(rs.next())
	      {
	    	  strDB=rs.getString(1);
	      }
	      Statement stmt1 = obj.conn.createStatement();
	      String query1 = "delete from ImageStore where row=1";
	  stmt1.executeUpdate(query1);
	      

	}

}

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;




public class FirstImage extends HttpServlet{
	  static  String filePath ;

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		   File file ;
		   int maxFileSize = 5000 * 1024;
		   int maxMemSize = 5000 * 1024;
		   String fileName = null;
		   DBConnection obj = new DBConnection();
			obj.getConnection();
		   ServletContext context = getServletContext();
		   filePath =  getServletContext().getRealPath("/images");
		   System.out.println(filePath);
		   response.setContentType("text/html");
		  
		   // Verify the content type
		   String contentType = request.getContentType();
		   if ((contentType.indexOf("multipart/form-data") >= 0)) {

		      DiskFileItemFactory factory = new DiskFileItemFactory();
		      // maximum size that will be stored in memory
		      factory.setSizeThreshold(maxMemSize);
		      // Location to save data that is larger than maxMemSize.
		      factory.setRepository(new File("C:\temp"));

		      // Create a new file upload handler
		      ServletFileUpload upload = new ServletFileUpload(factory);
		      // maximum file size to be uploaded.
		      upload.setSizeMax( maxFileSize );
		      try{ 
		         // Parse the request to get file items.
		         List fileItems = upload.parseRequest(request);
		         // Process the uploaded file items
		         Iterator i = fileItems.iterator();
		         
		        
		        
		         while ( i.hasNext () ) 
		         {
		            FileItem fi = (FileItem)i.next();
		            if ( !fi.isFormField () )	
		            {
		            // Get the uploaded file parameters
		            String fieldName = fi.getFieldName();
		             fileName = fi.getName();
		            boolean isInMemory = fi.isInMemory();
		            long sizeInBytes = fi.getSize();
		            // Write the file
		            if( fileName.lastIndexOf("\\") >= 0 ){
		            file = new File( filePath +"/"+ 
		            fileName.substring( fileName.lastIndexOf("\\"))) ;
		            }else{
		            file = new File( filePath +"/"+ 
		            fileName.substring(fileName.lastIndexOf("\\")+1)) ;
		            }
		            fi.write( file ) ;
		            
		            }
		         }
		         }catch(Exception ex) {
		         System.out.println(ex);
		      }
		      
		   }else{
		     System.out.println("no file uploaded");
		   }
		   try {
			new DataBase(fileName);

          }

}