java 后台获取访问客户端ip地址

1. protected String getClientIpAddress(HttpServletRequest request) {  
2.         String clientIp = request.getHeader("x-forwarded-for");  
3.         if(clientIp == null || clientIp.length() == 0 || "unknown".equalsIgnoreCase(clientIp)) {  
4.             clientIp = request.getHeader("Proxy-Client-IP");  
5.         }  
6.         if(clientIp == null || clientIp.length() == 0 || "unknown".equalsIgnoreCase(clientIp)) {  
7.             clientIp = request.getHeader("WL-Proxy-Client-IP");  
8.         }  
9.         if(clientIp == null || clientIp.length() == 0 || "unknown".equalsIgnoreCase(clientIp)) {  
10.             clientIp = request.getRemoteAddr();  
11.         }  
12.         return clientIp;  
13.     }