项目连接mysql时报caching_sha2_password错误

错误信息如下：

java.sql.SQLException: Unable to load authentication plugin 'caching_sha2_password'.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:545)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:489)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:78)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1606)
	at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:633)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:347)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:219)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1560)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1623)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2468)
Caused by: com.mysql.cj.core.exceptions.WrongArgumentException: Unable to load authentication plugin 'caching_sha2_password'.
	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.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
	at com.mysql.cj.mysqla.authentication.MysqlaAuthenticationProvider.proceedHandshakeWithPluggableAuthentication(MysqlaAuthenticationProvider.java:564)
	at com.mysql.cj.mysqla.authentication.MysqlaAuthenticationProvider.connect(MysqlaAuthenticationProvider.java:204)
	at com.mysql.cj.mysqla.io.MysqlaProtocol.connect(MysqlaProtocol.java:1414)
	at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:132)
	at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1726)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1596)
	... 9 more

重点看caching_sha2_password这个，由于我安装的mysql是8.0的版本，

mysql8.0和5.x其中一个改动就是加密认证方式发生改变，

caching_sha2_password是8.0
mysql_native_password是5.x

解决方案有两个：

1，更改mysql的加密认证方式，更改方法请参考：https://blog.csdn.net/h996666/article/details/80921913

2，更改mysql的jdbc版本，直接在xx.pom修改版本号即可。

mysql jdbc的maven链接：http://mvnrepository.com/artifact/mysql/mysql-connector-java

8.0.x之后的应该都是可以的

我选择了第2个方案，第一个方案没试过。