j2ee实现提取数字证书信息

　　　　　　　　　if(request.isSecure())     //判断是否采用SSL
		{
			final String attname= "javax.servlet.request.X509Certificate";
			X509Certificate[] chain= (X509Certificate[])request.getAttribute(attname);//客户证书链
			if(chain == null)
			{
				resultBasicVO.setMessage("没有客户端证书链");
				return resultBasicVO;
			}
			X509Certificate userCert= chain[0];     //客户证书
			String dname = userCert.getSubjectDN().getName();
			String field = "CN=";
			String udata = dname.substring(dname.indexOf(field) + field.length());
			String[] dataArr = udata.split(",");
			String nameAndId = dataArr[0];
			String idcard = nameAndId.split(" ")[1];
			resultBasicVO.setMessage(idcard);
			resultBasicVO.setResult(true);
			return resultBasicVO;
		}