String result = "";
    String userid = request.getParameter("userid");
    String pswd = request.getParameter("pswd");
    String name = request.getParameter("name");

    request.setCharacterEncoding("UTF-8");
    String bloodgroup = request.getParameter("bloodgroup");
    String mob = request.getParameter("mob");
    String city = request.getParameter("city");
    String Availability = request.getParameter("Availability");
    try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/blood", "root", "root");

        String s = "insert into registration values(?,?,?,?,?,?,?)";
        PreparedStatement ps = con.prepareStatement(s);

        ps.setString(1, name);
        ps.setBytes(2, bloodgroup.getBytes("UTF-8"));
        ps.setString(3, mob);
        ps.setString(4, city);

        ps.setString(5, userid);
        ps.setString(6, pswd);
        ps.setString(7, Availability);
        int x = ps.executeUpdate();
        if (x > 0) {
            result = "Data Saved";
        }
    } catch (Exception e) {
        result = e.toString();
    }
    PrintWriter pw = response.getWriter();
    pw.write(result);

}