Java获取客户端信息以及IP地址

<dependency>
    <groupId>eu.bitwalker</groupId>
    <artifactId>UserAgentUtils</artifactId>
</dependency>

// 获取 http 请求类  
HttpServletRequest httpServletRequest = ServletUtils.getRequest();  
// 获取客户端信息  
String header = httpServletRequest.getHeader("User-Agent");  
// 解析客户端信息  
final UserAgent userAgent = UserAgent.parseUserAgentString(header);

// 获取客户端操作系统
String os = userAgent.getOperatingSystem().getName();
// 获取客户端浏览器
String browser = userAgent.getBrowser().getName();

/**
 * 获取客户端IP地址
 *
 * @param request HttpServletRequest对象
 * @return 客户端IP地址
 */
public static String getIpAddr(HttpServletRequest request) {
    if (request == null) return "unknown";
    // 从HTTP请求头中获取代理服务器传递的客户端IP地址
    String ip = request.getHeader("x-forwarded-for");
    // 若未获取到，尝试其他可能的头信息----用于比较两个字符串是否相等，而且不区分大小写
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("X-Forwarded-For");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("X-Real-IP");
    }
    // 若仍未获取到，使用远程地址
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
    }
    // 处理IPv6本地回环地址
    // EscapeUtil.clean(ip) 清除HTML标签，保留内容
    return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : EscapeUtil.clean(ip);
}

String ip = ServletUtil.getClientIP(request);

/**
 * 判断 ip 是否是内部 ip
 * @param ip ip
 * @return true 是内部，false 不是
 */
public static boolean internalIp(String ip) {
    byte[] addr = textToNumericFormatV4(ip);
    return internalIp(addr) || "127.0.0.1".equals(ip);
}

private static boolean internalIp(byte[] addr) {
    if (StringUtils.isNull(addr) || addr.length < 2) {
        return true;
    }
    final byte b0 = addr[0];
    final byte b1 = addr[1];
    // 10.x.x.x/8
    final byte SECTION_1 = 0x0A;
    // 172.16.x.x/12
    final byte SECTION_2 = (byte) 0xAC;
    final byte SECTION_3 = (byte) 0x10;
    final byte SECTION_4 = (byte) 0x1F;
    // 192.168.x.x/16
    final byte SECTION_5 = (byte) 0xC0;
    final byte SECTION_6 = (byte) 0xA8;
    switch (b0) {
        case SECTION_1:
            return true;
        case SECTION_2:
            if (b1 >= SECTION_3 && b1 <= SECTION_4) return true;
        case SECTION_5:
            if (b1 == SECTION_6) return true;
        default:
            return false;
    }
}

/**
 * 将IPv4地址转换成字节
 *
 * @param text IPv4地址
 * @return byte 字节
 */
public static byte[] textToNumericFormatV4(String text) {
    if (text.length() == 0) return null;

    byte[] bytes = new byte[4];
    String[] elements = text.split("\\.", -1);
    try {
        long l;
        int i;
        switch (elements.length) {
            case 1:
                l = Long.parseLong(elements[0]);
                if ((l < 0L) || (l > 4294967295L)) {
                    return null;
                }
                bytes[0] = (byte) (int) (l >> 24 & 0xFF);
                bytes[1] = (byte) (int) ((l & 0xFFFFFF) >> 16 & 0xFF);
                bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
                bytes[3] = (byte) (int) (l & 0xFF);
                break;
            case 2:
                l = Integer.parseInt(elements[0]);
                if ((l < 0L) || (l > 255L)) {
                    return null;
                }
                bytes[0] = (byte) (int) (l & 0xFF);
                l = Integer.parseInt(elements[1]);
                if ((l < 0L) || (l > 16777215L)) {
                    return null;
                }
                bytes[1] = (byte) (int) (l >> 16 & 0xFF);
                bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
                bytes[3] = (byte) (int) (l & 0xFF);
                break;
            case 3:
                for (i = 0; i < 2; ++i) {
                    l = Integer.parseInt(elements[i]);
                    if ((l < 0L) || (l > 255L)) {
                        return null;
                    }
                    bytes[i] = (byte) (int) (l & 0xFF);
                }
                l = Integer.parseInt(elements[2]);
                if ((l < 0L) || (l > 65535L)) {
                    return null;
                }
                bytes[2] = (byte) (int) (l >> 8 & 0xFF);
                bytes[3] = (byte) (int) (l & 0xFF);
                break;
            case 4:
                for (i = 0; i < 4; ++i) {
                    l = Integer.parseInt(elements[i]);
                    if ((l < 0L) || (l > 255L)) {
                        return null;
                    }
                    bytes[i] = (byte) (int) (l & 0xFF);
                }
                break;
            default:
                return null;
        }
    } catch (NumberFormatException e) {
        return null;
    }
    return bytes;
}

boolean innerIP = NetUtil.isInnerIP(ip);