获取客户端ip地址

	public String getIpadd() {
		try {
			FacesContext fc = FacesContext.getCurrentInstance();
			HttpServletRequest request = (HttpServletRequest) fc
					.getExternalContext().getRequest();
//			ipadd = request.getRemoteAddr();
			ipadd = request.getHeader("x-forwarded-for");
			if(ipadd == null || ipadd.length() == 0 || "unknown".equalsIgnoreCase(ipadd)) { 
		        ipadd = request.getHeader("Proxy-Client-IP"); 
		    } 
		    if(ipadd == null || ipadd.length() == 0 || "unknown".equalsIgnoreCase(ipadd)) { 
		        ipadd = request.getHeader("WL-Proxy-Client-IP"); 
		    } 
		    if(ipadd == null || ipadd.length() == 0 || "unknown".equalsIgnoreCase(ipadd)) { 
		        ipadd = request.getRemoteAddr(); 
		    } 

			return ipadd;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return "";
	}