Java插入中文到数据库中文变成问号???解决办法

在url后面添加参数：url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8

DriverManager.getConnection("jdbc:mysql://localhost:3306/students?useUnicode=true&characterEncoding=utf-8", "root", "");

DriverManager.getConnection("jdbc:mysql://localhost:3306/students", "root", "");