java servlet获得客户端相关信息的简单代码

java web很常用的功能代码，可以配合实现IP白名单控制，直接贴代码：

复制代码 代码如下:
import javax.servlet.http.HttpServletRequest;

public class ClientInfoUtil{

static public String getIP(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;
}

static public String getURL(HttpServletRequest request) {
    String url = request.getScheme()+"://";  
    url+=request.getHeader("host");  
    url+=request.getRequestURI();  
    if(request.getQueryString()!=null)  {
        url+="?"+request.getQueryString();  
    }
    return url;
}
}