慎用 Hibernate Validator @Email

用户注册表单用了 @ Email 来验证，顺手写了测试用例，结果发现跟预想的不一致。如 “ i @ Home ” 之类的邮箱也可以成功注册。看了源码发现是有坑啊，DOMAIN 正则并没有要求必须包含点(.)，没有校验域名后缀。最后用 EMAIL_DOMAIN_PATTERN 匹配邮箱域名。

	private static final String DOMAIN_CHARS_WITHOUT_DASH = "[a-z\u0080-\uFFFF0-9!#$%&'*+/=?^_`{|}~]";
	private static final String DOMAIN_LABEL = "(" + DOMAIN_CHARS_WITHOUT_DASH + "-*)*" + DOMAIN_CHARS_WITHOUT_DASH + "+";
	private static final String DOMAIN = DOMAIN_LABEL + "+(\\." + DOMAIN_LABEL + "+)*";

	private static final String IP_DOMAIN = "[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}";
	
	private static final String IP_V6_DOMAIN = "(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))";

	private static final Pattern EMAIL_DOMAIN_PATTERN = Pattern.compile(
			DOMAIN + "|\\[" + IP_DOMAIN + "\\]|" + "\\[IPv6:" + IP_V6_DOMAIN + "\\]", CASE_INSENSITIVE
	);