code: public static String connectOauth2Authorize(String appid,String redirect_uri,boolean snsapi_userinfo,String state){
  		return connectOauth2Authorize(appid, redirect_uri, snsapi_userinfo, state, null);
  	}
docs: 生成网页授权 URL
  @param appid appid
  @param redirect_uri 自动URLEncoder
  @param snsapi_userinfo snsapi_userinfo
  @param state 可以为空
  @return url