[root@localhost tmp]# tar -zxvf jdk-8u161-linux-x64.tar.gz -C /opt
[root@localhost tmp]# cd /opt
[root@localhost opt]# mv jdk1.8.0_161 jdk1.8

[root@localhost mysoft]# ps -aux|grep java
[root@localhost mysoft]# rpm -e --nodeps rpm -qa | grep java

[root@localhost /]# vim /etc/profile
# 文件末尾追加 下面内容 shit+g 跳到文件末尾
# JAVA_HOME
export JAVA_HOME=/usr/local/mysoft/jdk1.8
export PATH=$PATH:$JAVA_HOME/bin

[root@localhost /]# java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)

[root@localhost tmp]# tar -zxvf apache-tomcat-8.5.40.tar.gz -C /opt
[root@localhost opt]# mv apache-tomcat-8.5.40 tomcat8

[root@localhost bin]# pwd
/opt//tomcat8/bin
[root@localhost bin]# ./startup.sh

http://127.0.0.1:8080/