今天尝试数据库，代码确实没问题就是给了给这个东西

java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199)
	at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
	at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
	at db.Prepare.main(Prepare.java:22)

后来在大佬们的帮助下得知
数据库时区设置错误。

解决方法：分两种，但原理都是时区设置为当前系统时区

1、在连接数据库语句中的url变量中修改

Connection conn =DriverManager.getConnection("jdbc:mysql://localhost:3306/t_user","root","root");//修改前
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/t_user?serverTimezone=GMT%2B8","root","root");//修改后

2、使用root用户登录mysql，执行以下语句

set global time_zone=’+8:00’;
提示Query OK…即为成功。