String code2SessionUrl = "https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code";
String appid = "appid";
String appsecret = "appsecret";
String code = "code";
String url = MessageFormat.format(code2SessionUrl, appid, appsecret, code);
System.out.println(url);
