IPUtil

package com.msxf.eyas.common.util;  import org.slf4j.Logger; import org.slf4j.LoggerFactory;  import javax.servlet.http.HttpServletRequest; import java.net.*; import java.util.Enumeration; import java.util.HashMap; import java.util.List; import java.util.Map;  public final class IPUtil {
   private IPUtil(){}
   private static final Logger log = LoggerFactory.getLogger(IPUtil.class);  private static final Map, String> subnetMaskMap = new HashMap, String>();  static{
      subnetMaskMap.put("8", "255.0.0.0");  subnetMaskMap.put("16", "255.255.0.0");  subnetMaskMap.put("24", "255.255.255.0");  subnetMaskMap.put("128", "(::1/128");  subnetMaskMap.put("10", "fe80::203:baff:fe27:1243/10");  }

   /**  * 获取客户端IP  * @see --------------------------------------------------------------------------------------------------  * @see 1.JSP中获取客户端IP地址的方法是request.getRemoteAddr(),这种方法在大部分情况下都是有效的  * @see 但是在通过了Apache,Squid等反向代理软件后,获取到的就不是客户端的真实IP地址了  * @see 2.经过代理后,由于在客户端和服务端之前增加了中间层,因此服务器无法直接拿到客户端IP  * @see 但在转发请求的HTTP头中增加了X-FORWARDED-FOR,用以跟踪原有的客户端IP地址和原来客户端请求的服务器地址  * @see 3.经过多级反向代理后,X-FORWARDED-FOR的值就会不止一个,而是一串IP值,那么有效IP便是第一个非unknown的字符串  * @see 更多详细介绍见http://dpn525.iteye.com/blog/1132318  * @see --------------------------------------------------------------------------------------------------  */  public static String getClientIP(HttpServletRequest request){
      String IP = request.getHeader("x-forwarded-for");  if(null==IP || 0==IP.length() || "unknown".equalsIgnoreCase(IP)){
         IP = request.getHeader("Proxy-Client-IP");  }
      if(null==IP || 0==IP.length() || "unknown".equalsIgnoreCase(IP)){
         IP = request.getHeader("WL-Proxy-Client-IP");  }
      if(null==IP || 0==IP.length() || "unknown".equalsIgnoreCase(IP)){
         IP = request.getRemoteAddr();  }
      //对于通过多个代理的情况,第一个IP为客户端真实IP  //多个IP会按照','分割('***.***.***.***'.length()=15)  if(null!=IP && IP.length()>15){
         if(IP.indexOf(",") > 0){
            IP = IP.substring(0, IP.indexOf(","));  }
      }
      return IP;  }


   /**  * 获取客户端IP的另一种写法  * @see 暂不推荐使用,因为已经有{@link IPUtil#getClientIP(HttpServletRequest)}方法了  */  @Deprecated  public static String getClientIP_(HttpServletRequest request){
      String IP = null;  Enumeration enu = request.getHeaderNames();  while(enu.hasMoreElements()){
         String name = enu.nextElement();  if(name.equalsIgnoreCase("X-Forwarded-For")){
            IP = request.getHeader(name);  }else if(name.equalsIgnoreCase("Proxy-Client-IP")){
            IP = request.getHeader(name);  }else if(name.equalsIgnoreCase("WL-Proxy-Client-IP")){
            IP = request.getHeader(name);  }
         if(null!=IP && 0!=IP.length()){
            break;  }
      }
      if(null==IP || 0==IP.length()){
         IP = request.getRemoteAddr();  }
      return IP;  }


   /**  * 获取服务器IP的另一种写法  * @see 暂不推荐使用,因为已经有{@link IPUtil#getServerIP()}方法了  * @see 另外,对于该方法,单网卡时返回"/192.168.2.173",多网卡时返回"/192.168.2.173/192.168.56.1"  */  @Deprecated  public static String getServerIP_(){
      String serverIP = "";  try{
         Enumeration nets = NetworkInterface.getNetworkInterfaces();  while(nets.hasMoreElements()){
            NetworkInterface net = nets.nextElement();  Enumeration addresses = net.getInetAddresses();  while(addresses.hasMoreElements()){
               InetAddress IP = addresses.nextElement();  if(null!=IP && IP instanceof Inet4Address && !IP.getHostAddress().equals("127.0.0.1")){
                  serverIP += IP.toString();  }
            }
         }
      }catch(SocketException e){
         log.error("服务器IP地址获取失败,堆栈轨迹如下", e);  serverIP = "服务器IP地址获取失败";  }
      return serverIP;  }


   /**  * 获取服务器IP  * @see 1.InetAddress.getLocalHost()在Windows下能获取到服务器IP,但Linux下获取到的就是127.0.0.1  * @see 2.java.net.InterfaceAddress是JDK6.0新增的  * @see 3.单网卡时会返回其IP,多网卡时会返回第一块网卡的IP  * @create Aug 28, 2015 5:37:24 PM  * @author 玄玉<http://blog.csdn.net/jadyer>
    */  public static String getServerIP(){
      String serverIP = "";  try{
         Enumeration nets = NetworkInterface.getNetworkInterfaces();  tag:while(nets.hasMoreElements()){
            NetworkInterface net = nets.nextElement();  if(null != net.getHardwareAddress()){
               List addressList = net.getInterfaceAddresses();  for(InterfaceAddress obj : addressList){
                  InetAddress IP = obj.getAddress();  if(null!=IP && IP instanceof Inet4Address && !IP.getHostAddress().equals("127.0.0.1")){
                     System.out.println("IP=[" + IP.getHostAddress() +"]的子网掩码为=[" + subnetMaskMap.get(String.valueOf(obj.getNetworkPrefixLength())) + "]");  serverIP = IP.getHostAddress();  break tag;  }
               }
            }
         }
      }catch(SocketException e){
         log.error("服务器IP地址获取失败,堆栈轨迹如下", e);  serverIP = "服务器IP地址获取失败";  }
      return serverIP;  }
}