获取客户端IP

1.

public String getRemoteIp(HttpServletRequest request){
    
    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;

  }