java获取ip地址和验证ip是否合法。

java验证ip是否合法和获取HttpServletRequest的ip地址，代码如下。

public class IPUtils {
	  /**
     * ip校验
     * @param s
     * @return Boolean
     */
    public static Boolean isIpAddress(String s){
            String regex = "(((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))[.](((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))[.](((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))[.](((2[0-4]\\d)|(25[0-5]))|(1\\d{2})|([1-9]\\d)|(\\d))";
            Pattern p = Pattern.compile(regex);
            Matcher m = p.matcher(s);
            return m.matches();
    }

    /**
     * 获取客户端ip
     * @param request
     * @return String
     */
    public static String getClientAddress(HttpServletRequest request) {
        String address = request.getHeader("X-Forwarded-For");
        if (address != null &&isIpAddress(address)) {
            return address;
        }
        return request.getRemoteAddr();
    }
}