JAVA獲取訪問用戶的客戶端IP（適用於公網與局域網）

JAVA獲取訪問用戶的客戶端IP（適用於公網與局域網）

/**
 * 獲取訪問用戶的客戶端IP（適用於公網與局域網）.
 */
public static final String getIpAddr(final HttpServletRequest request)
        throws Exception {
    if (request == null) {
        throw (new Exception("getIpAddr method HttpServletRequest Object is null"));
    }
    String ipString = request.getHeader("x-forwarded-for");
    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {
        ipString = request.getHeader("Proxy-Client-IP");
    }
    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {
        ipString = request.getHeader("WL-Proxy-Client-IP");
    }
    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {
        ipString = request.getRemoteAddr();
    }

    // 多個路由時，取第一個非unknown的ip
    final String[] arr = ipString.split(",");
    for (final String str : arr) {
        if (!"unknown".equalsIgnoreCase(str)) {
            ipString = str;
            break;
        }
    }

    return ipString;
}