import java.io.*;
import java.sql.*;
class InsertFileDataAsBLOB 
{
    public static void main(String[] args) 
    {
      try{
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
        File f = new File("C:/hello.txt");
        PreparedStatement psmnt = connection.prepareStatement("insert into file(file_data) values(?)");
        FileInputStream fis = new FileInputStream(f);
        psmnt.setBinaryStream(1, (InputStream)fis, (int)(f.length()));
        int s = psmnt.executeUpdate();
        if(s>0){
        System.out.println("Inserted successfully !");
        }
        else{
        System.out.println("Error!");
        }
      }
      catch(Exception e){
          e.printStackTrace();
    }
  }
}

Thanks!!!