tomcat忘记密码的时候，可以通过进入安全模式，再修改密码

1.过程1

mysqld_safe --skip-grant-tables &

mysql -uroot -p (回车进入)

mysql>use mysql;

mysql> update user set password=PASSWORD("root") where user="root";

mysql> flush privileges;

mysql> quit;

2.过程2

mysql -uroot -proot

grant all privileges on *.* to root@'%' identified by 'root' with grant option;

//grant all privileges on *.* to 'root'@'localhost' identified by 'root' with grant option;

flush privileges;

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'root' WITH GRANT OPTION;

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'password' WITH GRANT OPTION;