How to get IP address from HttpServletRequest

The following Java code can be utilized to get the IP address / remote IP address from HttpServletRequest in Java.The following Java code can be utilized to get the IP address / remote IP address from HttpServletRequest in Java.

package com.errorConsole.utils;

import java.io.Serializable;

import javax.servlet.http.HttpServletRequest;

public class HttpRequestUtil implements Serializable{

	public static String getIpAddress(HttpServletRequest request) { 
	    String ip = request.getHeader("x-forwarded-for"); 
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("Proxy-Client-IP");  
	    }  
	    
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("x-real-ip");  
	    }

	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("x-forwarded-server");  
	    }
	    
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("x-forwarded-host");  
	    }
	    
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("cf-connecting-ip");  
	    }
	    
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("WL-Proxy-Client-IP");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_X_FORWARDED");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_X_CLUSTER_CLIENT_IP");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_CLIENT_IP");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_FORWARDED_FOR");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_FORWARDED");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("HTTP_VIA");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getHeader("REMOTE_ADDR");  
	    }  
	    if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {  
	        ip = request.getRemoteAddr();  
	    }  
	    return ip; 
	  } 
}