解决错误Establishing SSL connection without server‘s identity verification is not recommended.

在学习黑马程序员的javaweb时连接数据库出现报错

Tue Jul 05 13:49:34 CST 2022 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Exception in thread "main" java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3933)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3869)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:864)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1707)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1217)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2189)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2220)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2015)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:768)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)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.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:385)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:323)at java.sql.DriverManager.getConnection(DriverManager.java:664)at java.sql.DriverManager.getConnection(DriverManager.java:247)at com.itheima.jdbc.JDBCDemo.main(JDBCDemo.java:19)Process finished with exit code 1

简单的来说，就是需要设置一下useSSL，你可以设置为false来禁用SSL，或者设置为true来使用SSL，报这个警告的原因主要是JDBC的版本与MySQL的版本不兼容，而MySQL在高版本需要指明是否进行SSL连接。

在配置文件中的连接数据库的URL后面添加

?useSSL=false

问题解决
参考：https://blog.51cto.com/u_12564104/2896742

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