JAVA实用总结(代码)

         1、获取外网地址

 private 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;
 }