yum节省安装时间

yum install java-1.8.0-openjdk 安装jdk

yum install tomcat 安装tomcat

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum install mysql-server 安装mysql

重置密码
 
重置密码前，首先要登录
 
$ mysql -u root
登录时有可能报这样的错：ERROR  (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ ()，原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户：
 
$ sudo chown -R openscanner:openscanner /var/lib/mysql
然后，重启服务：
 
$ service mysqld restart
接下来登录重置密码：
 
$ mysql -u root
mysql > use mysql;mysql > update user set password=password(‘‘) where user=‘root‘;mysql > exit;

systemctl status tomcat.service 查看tomcat是否死亡状态，如果死亡状态进行下一步

systemctl start tomcat.service 跑tomcat

systemctl stop tomcat.service 停止

systemctl restart tomcat.service重启

systemctl enable tomcat 设置开机启动

systemctl stop firewalld.service 关闭防火墙

如果usr/share/tomcat/apps里面为空，输入yum install tomcat-webapps tomcat-admin-webapps

下载 mysql-connector-java
下载地址:https://mvnrepository.com/artifact/mysql/mysql-connector-java
以为例：mysql-connector-java-5.1.25.tar.gz为例：
将mysql-connector-java-5.1.25.tar.gz解压并放在/usr/local/下：
cd mysql-connector-java-5.1.25

cp mysql-connector-java-5.1.25-bin.jar /usr/local/tomcat/lib

重启tomcat
cd /usr/local/tomcat/bin
./shutdown.sh
./startup.sh