Java tutorial
/* * Copyright [2015] [wisemapping] * * Licensed under WiseMapping Public License, Version 1.0 (the "License"). * It is basically the Apache License, Version 2.0 (the "License") plus the * "powered by wisemapping" text requirement on every single page; * you may not use this file except in compliance with the License. * You may obtain a copy of the license at * * http://www.wisemapping.org/license * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.wisemapping.validator; import org.jetbrains.annotations.Nullable; import org.springframework.validation.Errors; import org.springframework.validation.ValidationUtils; import java.util.regex.Pattern; import java.util.regex.Matcher; final public class Utils { //Set the email emailPattern string static private Pattern emailPattern = Pattern.compile(".+@.+\\.[a-z]+"); private Utils() { } static void validateEmailAddress(final String email, final Errors errors) { if (email == null || email.trim().length() == 0) { ValidationUtils.rejectIfEmptyOrWhitespace(errors, "email", Messages.FIELD_REQUIRED); } else { boolean isValid = Utils.isValidateEmailAddress(email); if (!isValid) { errors.rejectValue("email", Messages.NO_VALID_EMAIL_ADDRESS); } } } static boolean isValidateEmailAddress(@Nullable final String email) { boolean result = false; if (email != null) { //Match the given string with the emailPattern final Matcher m = emailPattern.matcher(email); //check whether match is found result = m.matches(); } return result; } }