Validador de email java.

EmailValidator.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

/**
 * Validador de e-mail.
 * @author thania
 */
public class EmailValidator {

    private Pattern pattern = null;
	private Matcher matcher = null;

	public static final String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

	public EmailValidator() {
		pattern = Pattern.compile(EMAIL_PATTERN);
	}

	/**
	 * Valida o e-mail.
	 * @param email texto com o email. 
	 * @return <code>true</code> se válido, <code>false</code> caso contrário.
	 */
	public boolean isValid(final String email) {
		if (StringUtils.isBlank(email)) return false;
		
		matcher = pattern.matcher(email);
		return matcher.matches();
	}
}