客户端不支持服务器请求的身份验证协议；请考虑升级MySQL客户端

Java在用JDBC连接Mysql时，执行到：

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/aa","root","jian8182");

时，报错：

Client does not support authentication protocol requested by server; consider upgrading MySQL client

解决步骤：

1.