获取客户端真实IP——request.getHeader("x-forwarded-for")

/*
**获得客户端真实IP的方法
*/

/*
** 1st
*/
public String getRemortIP( HttpServletRequest request ) {
	if (request.getHeader( "x-forwarded-for" ) == null) {
		return request.getRemoteAddr();
	}
	return request.getHeader( "x-forwarded-for" );
}

/*
** 2nd
*/
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;
}