获取访问IP工具类

package util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class CusAccessObjectUtil {  
  
    /** 
     * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
     * 参考文章： http://developer.51cto.com/art/201111/305181.htm 
     *  
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 
     * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
     *  
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
     * 192.168.1.100 
     *  
     * 用户真实IP为： 192.168.1.110 
     *  
     * @param request 
     * @return 
     */  
    public static String getIpAddress(HttpServletRequest request) {  
    	  String ipAddress = request.getHeader("x-forwarded-for");  
          if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
              ipAddress = request.getHeader("Proxy-Client-IP");  
          }  
          if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
              ipAddress = request.getHeader("WL-Proxy-Client-IP");  
          }  
          if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
              ipAddress = request.getRemoteAddr();  
              if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){  
                  //根据网卡取本机配置的IP  
                  InetAddress inet=null;  
                  try {  
                      inet = InetAddress.getLocalHost();  
                      ipAddress= inet.getHostAddress(); 
                  } catch (UnknownHostException e) {  
                      e.printStackTrace();  
                  }   
              }  
          }  
          //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按照','分割  
          if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15  
              if(ipAddress.indexOf(",")>0){  
                  ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));  
              }  
          }  
          return ipAddress;   
    }  
    
    
    public static String getLocalIP() throws UnknownHostException {  
    	  String localIP = "";  
    	  InetAddress addr = (InetAddress) InetAddress.getLocalHost();  
    	
    	  localIP = addr.getHostAddress().toString();  
    	  return localIP;  
    	  }  
    
      
}