centos安装java环境

rpm -ivh jdk-8u221-linux-x64.rpm

rpm -qa|grep jdk :查看java环境信息

rpm -e --nodeps jdk_：删除Java环境

配置环境变量：
cd /etc/profile
JAVA_HOME=/.../jdk1.8.0_221-amd64
CLASSPATH=%JAVA_HOME%lib;%JAVA_HOME%/jre/lib
PATH=JAVA_HOME/jre/bin
export PATH CLASSPATH JAVA_HOME

使配置生效：source /etc/profile
开启防火墙端口：firewall-cmd --zone=public --add-port=9000/tcp --permanent
重启防火墙：systemctl restart firewalld.service
查看防火墙开放端口：firewall-cmd --list-ports

tomcat启动：./startup.sh
tomcat停止：./shutdown.sh