在portlet获取客户端IP地址(转)

<p>方案一 通过反射直接获取HttpServletRequest
//Liferay 屏蔽了获取remoteHost 方法，但request对象是保留在私有域
java.lang.reflect.Field f =
request.getClass().getDeclaredField(&quot;_request &quot;);
f.setAccessible(true) ;//设置该变量可视
HttpServletRequest httpServletRequest = (HttpServletRequest)
f.get(request); //拿到Request
/*  以下处理用代理时的情况 */
String ip = httpServletRequest.getHeader(&quot;x-forwarded-for&quot;);
if(ip == null || ip.length() == 0 || &quot;unknown&quot;.equalsIgnoreCase(ip)) {
   ip = httpServletRequest.getHeader(&quot;Proxy-Client-IP&quot;);
}
if(ip == null || ip.length() == 0 || &quot;unknown&quot;.equalsIgnoreCase(ip)) {
   ip = httpServletRequest.getHeader(&quot;WL-Proxy-Client-IP&quot;);
}
if(ip == null || ip.length() == 0 || &quot;unknown&quot;.equalsIgnoreCase(ip)) {
   ip = httpServletRequest.getRemoteAddr();
}
System.out.println(&quot;ip:=&quot;+ip);
方案二 通过Liferay提供的工具
HttpServletRequest httpServletRequest =
com.liferay.portal.util.PortalUtil.getHttpServletRequest(renderRequest);
String ip = httpServletRequest.getHeader(&quot;x-forwarded-for&quot;);
if(ip == null || ip.length() == 0 || &quot;unknown&quot;.equalsIgnoreCase(ip)) {
   ip = httpServletRequest.getHeader(&quot;Proxy-Client-IP&quot;);
}
if(ip == null || ip.length() == 0 || &quot;unknown&quot;.equalsIgnoreCase(ip)) {
   ip = httpServletRequest.getHeader(&quot;WL-Proxy-Client-IP&quot;);
}
if(ip == null || ip.length() == 0 || &quot;unknown&quot;.equalsIgnoreCase(ip)) {
   ip = httpServletRequest.getRemoteAddr();
}
System.out.println(&quot;ip:=&quot;+ip);</p>