1截取链接地址
String URL = request.getRequestURL().toString();
if(!URL.startsWith("https:"))
{
System.out.println("HTTPS");
}
2JS获取协议
if("https:" == document.location.protocol)
alert("HTTPS");
3Java获取协议
if("http".equals(request.getScheme()))
System.out.println("HTTP");
if("https".equals(request.getScheme()))
System.out.println("HTTPS");