Can i minimize my function with this two post sends, i have problem with connecting with server

Question

            let location = $('input[name="searchBoxl"]').val();
            let type = document.getElementById("types").value;

#Opcioni problem

                $.post({
                    url: "rest/login?username=" + username + "&password=" + password,
                    contentType: "application/json",
                    success: function(odgovor) {}

#I ovde je post method

#Ovaj deo je DAO

private void writePromoCode(String putanja, PromoCode code) throws IOException {
    putanja += "\\data\\Codes.csv";
    Writer upis = new BufferedWriter(new FileWriter(putanja, true));
    upis.append(code.getId());
    upis.append(",");
    upis.append(code.getCode());
    upis.append(",");
    upis.append(code.getUses().toString());
    upis.append(",");
    upis.append(code.getExpiraton());
    upis.append(",");
    upis.append(code.getDiscount().toString());
    upis.append("\n");
    upis.flush();
    upis.close();
}

#Ovde se opet javlja greska

#I ovde