private  String getIpAddr(final HttpServletRequest request)   {  
	    String ipString = request.getHeader("X-Forwarded-For");  
	    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
	    	ipString = request.getHeader("X-Real-IP");  
	    }  
	    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
	        ipString = request.getHeader("Proxy-Client-IP");  
	    }  
	    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
	        ipString = request.getHeader("WL-Proxy-Client-IP");  
	    }  
	    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
	        ipString = request.getRemoteAddr();  
	    }  
	      
	    // 多个路由时，取第一个非unknown的ip  
	    final String[] arr = ipString.split(",");  
	    for (final String str : arr) {  
	        if (!"unknown".equalsIgnoreCase(str)) {  
	            ipString = str;  
	            break;  
	        }  
	    }  
	      
	    return ipString;  
	}