Exception in thread "main" java.sql.SQLException: The server time zone value '??
?ú±ê×??±??' is unrecognized or represents more than one time zone. You must c
onfigure 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:207)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at ConnMySql.main(ConnMySql.java:7)
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The serv
er time zone value '???ú±ê×??±??' is unrecognized or represents more than one
 time zone. You must configure either the server or JDBC driver (via the serverT
imezone configuration property) to use a more specifc time zone value if you wan
t to utilize time zone support.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:85)
        at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:132)
        at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2234)
        at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2258)
        at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1319)
        at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:966)
        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825)
        ... 6 more

Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test?serverTimezone=GMT","test","test");