private static final String EMAIL_REGEX = "^\\s*?(.+)@(.+?)\\s*$";

private static final Pattern EMAIL_PATTERN = Pattern.compile(EMAIL_REGEX);

public boolean isValid(String email) {

       Matcher emailMatcher = EMAIL_PATTERN.matcher(email);

       if (!emailMatcher.matches()) {

                 return false;

       }

}

<dependency>

    <groupId>commons-validator</groupId>

    <artifactId>commons-validator</artifactId>

    <version>1.6</version>

</dependency>

public boolean validateEmail(String email) {

     return EmailValidator.getInstance().isValid(email);

}