java获取客户端IP地址

public String getIpAddr() {

HttpServletRequest request= this.getRequest();

String ip = request.getHeader("x-forwarded-for");

if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))

{ ip = request.getHeader("Proxy-Client-IP"); }

if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))

{ ip = request.getHeader("WL-Proxy-Client-IP"); }

if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))

{ ip = request.getRemoteAddr(); } return ip; }