在Struts2 中 怎样通过ActionInvocation对象 获得访问者的ip

在Struts2 中 怎样通过ActionInvocation对象 获得访问者的ip ；好像是在getInvocationContext（）里面 ， 各位帅哥美女 ！大哥大姐 ！ 小弟菜鸟一个！请求支援啊

Struts2中获得request及ip
//在struts2中获得request

HttpServletRequest request = ServletActionContext. getRequest();

//获得ip地址（防止代）

public String getIpAddr(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;
}

//http://hi.baidu.com/wxyhaiy/blog/item/67aeef3f9cac77c87d1e710d.html

[code="java"]ActionContext ctx = invocation.getInvocationContext();

HttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST); [/code]

有了request,剩下的不用我说了吧

request.getRemoteAddr()