遇到的错误：
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:3976)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2221)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2016)
at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:776)
at com.mysql.jdbc.JDBC4Connection.(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:386)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at com.baomidou.mybatisplus.generator.config.DataSourceConfig.getConn(DataSourceConfig.java:191)
at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.handlerDataSource(ConfigBuilder.java:269)
at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.(ConfigBuilder.java:132)
at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:92)
at com.nums.industry5.MyGenerator.main(MyGenerator.java:135)
Exception in thread “main” java.lang.NullPointerException
at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.getTablesInfo(ConfigBuilder.java:457)
at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.handlerStrategy(ConfigBuilder.java:281)
at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.(ConfigBuilder.java:142)
at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:92)
at com.nums.industry5.MyGenerator.main(MyGenerator.java:135
解决方法：
打开安装mysql数据库的地方，然后在my.ini这个文件中最后一行配置上下面这句话
skip-grant-tables
然后通过我的电脑—>管理—>服务—>找到mysql，将mysql这个服务进行重新启动，最后再重新进行登录就可以了.