content: package com.ruoyi.common.utils;
  
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import javax.servlet.http.HttpServletRequest;
  
  /**
   * 获取IP方法
   * 
   * @author ruoyi
   */
  public class IpUtils
  {
      public final static String REGX_0_255 = "(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
      // 匹配 ip
      public final static String REGX_IP = "((" + REGX_0_255 + "\\.){3}" + REGX_0_255 + ")";
      public final static String REGX_IP_WILDCARD = "(((\\*\\.){3}\\*)|(" + REGX_0_255 + "(\\.\\*){3})|(" + REGX_0_255 + "\\." + REGX_0_255 + ")(\\.\\*){2}" + "|((" + REGX_0_255 + "\\.){3}\\*))";
      // 匹配网段
      public final static String REGX_IP_SEG = "(" + REGX_IP + "\\-" + REGX_IP + ")";
  
      /**
       * 获取客户端IP
       * 
       * @param request 请求对象
       * @return IP地址
       */
      public static String getIpAddr(HttpServletRequest request)
      {
          if (request == null)
          {
              return "unknown";
          }
          String ip = request.getHeader("x-forwarded-for");
          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");
          }
  
          if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))
          {
              ip = request.getRemoteAddr();
          }
  
          return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : getMultistageReverseProxyIp(ip);
      }
  
      /**
       * 检查是否为内部IP地址
       * 
       * @param ip IP地址
       * @return 结果
       */
      public static boolean internalIp(String ip)
      {
          byte[] addr = textToNumericFormatV4(ip);
          return internalIp(addr) || "127.0.0.1".equals(ip);
      }
  
      /**
       * 检查是否为内部IP地址
       * 
       * @param addr byte地址
       * @return 结果
       */
      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:
                  switch (b1)
                  {
                      case 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;
      }
  
      /**
       * 获取IP地址
       * 
       * @return 本地IP地址
       */
      public static String getHostIp()
      {
          try
          {
              return InetAddress.getLocalHost().getHostAddress();
          }
          catch (UnknownHostException e)
          {
          }
          return "127.0.0.1";
      }
  
      /**
       * 获取主机名
       * 
       * @return 本地主机名
       */
      public static String getHostName()
      {
          try
          {
              return InetAddress.getLocalHost().getHostName();
          }
          catch (UnknownHostException e)
          {
          }
          return "未知";
      }
  
      /**
       * 从多级反向代理中获得第一个非unknown IP地址
       *
       * @param ip 获得的IP地址
       * @return 第一个非unknown IP地址
       */
      public static String getMultistageReverseProxyIp(String ip)
      {
          // 多级反向代理检测
          if (ip != null && ip.indexOf(",") > 0)
          {
              final String[] ips = ip.trim().split(",");
              for (String subIp : ips)
              {
                  if (false == isUnknown(subIp))
                  {
                      ip = subIp;
                      break;
                  }
              }
          }
          return StringUtils.substring(ip, 0, 255);
      }
  
      /**
       * 检测给定字符串是否为未知，多用于检测HTTP请求相关
       *
       * @param checkString 被检测的字符串
       * @return 是否未知
       */
      public static boolean isUnknown(String checkString)
      {
          return StringUtils.isBlank(checkString) || "unknown".equalsIgnoreCase(checkString);
      }
  
      /**
       * 是否为IP
       */
      public static boolean isIP(String ip)
      {
          return StringUtils.isNotBlank(ip) && ip.matches(REGX_IP);
      }
  
      /**
       * 是否为IP，或 *为间隔的通配符地址
       */
      public static boolean isIpWildCard(String ip)
      {
          return StringUtils.isNotBlank(ip) && ip.matches(REGX_IP_WILDCARD);
      }
  
      /**
       * 检测参数是否在ip通配符里
       */
      public static boolean ipIsInWildCardNoCheck(String ipWildCard, String ip)
      {
          String[] s1 = ipWildCard.split("\\.");
          String[] s2 = ip.split("\\.");
          boolean isMatchedSeg = true;
          for (int i = 0; i < s1.length && !s1[i].equals("*"); i++)
          {
              if (!s1[i].equals(s2[i]))
              {
                  isMatchedSeg = false;
                  break;
              }
          }
          return isMatchedSeg;
      }
  
      /**
       * 是否为特定格式如:“10.10.10.1-10.10.10.99”的ip段字符串
       */
      public static boolean isIPSegment(String ipSeg)
      {
          return StringUtils.isNotBlank(ipSeg) && ipSeg.matches(REGX_IP_SEG);
      }
  
      /**
       * 判断ip是否在指定网段中
       */
      public static boolean ipIsInNetNoCheck(String iparea, String ip)
      {
          int idx = iparea.indexOf('-');
          String[] sips = iparea.substring(0, idx).split("\\.");
          String[] sipe = iparea.substring(idx + 1).split("\\.");
          String[] sipt = ip.split("\\.");
          long ips = 0L, ipe = 0L, ipt = 0L;
          for (int i = 0; i < 4; ++i)
          {
              ips = ips << 8 | Integer.parseInt(sips[i]);
              ipe = ipe << 8 | Integer.parseInt(sipe[i]);
              ipt = ipt << 8 | Integer.parseInt(sipt[i]);
          }
          if (ips > ipe)
          {
              long t = ips;
              ips = ipe;
              ipe = t;
          }
          return ips <= ipt && ipt <= ipe;
      }
  
      /**
       * 校验ip是否符合过滤串规则
       * 
       * @param filter 过滤IP列表,支持后缀'*'通配,支持网段如:`10.10.10.1-10.10.10.99`
       * @param ip 校验IP地址
       * @return boolean 结果
       */
      public static boolean isMatchedIp(String filter, String ip)
      {
          if (StringUtils.isEmpty(filter) || StringUtils.isEmpty(ip))
          {
              return false;
          }
          String[] ips = filter.split(";");
          for (String iStr : ips)
          {
              if (isIP(iStr) && iStr.equals(ip))
              {
                  return true;
              }
              else if (isIpWildCard(iStr) && ipIsInWildCardNoCheck(iStr, ip))
              {
                  return true;
              }
              else if (isIPSegment(iStr) && ipIsInNetNoCheck(iStr, ip))
              {
                  return true;
              }
          }
          return false;
      }
  }