Java获取客户端真实IP地址

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