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：

import javax.servlet.http.httpservletrequest;

public class clientinfoutil{

/**
* 获得客户端的ip地址
* @param request
* @return
*/
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;
}

/**
* 获得客户端访问服务器的url地址
* @param request
* @return
*/
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;
}
}