Java class sun.net.www.protocol.http.HttpURLConnection cannot be cast to class问题解决

问题描述：

java.lang.ClassCastException: class sun.net.www.protocol.http.HttpURLConnection cannot be cast to class javax.net.ssl.HttpsURLConnection (sun.net.www.protocol.http.HttpURLConnection and javax.net.ssl.HttpsURLConnection are in module java.base of loader 'bootstrap')

问题分析：

1、url的协议为http，但是HttpsURLConnection只能转化协议为https的url。

解决办法：协议为https的url用HttpsURLConnection接收，协议为http的url用HttpURLConnection接收。