解决方案:在原有连接MySQL数据库的代码基础上添加:?useUnicode=true&characterEncoding=utf-8

原本:

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "123456");

修改之后:

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=utf-8", "root", "123456");

  

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