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下载Tomcat9Apache Tomcat Download将下载后的压缩包复制到/usr/local/src/作为备份命令：apache-tomcat-9.0.37.tar.gz /usr/local/src/解压Tomcat9将src下备份的JDK压缩包拷贝一份到/usr/java路径下cd /usr/localmkdir tomcatcd /usr/local/srccp jdk-8u261-linux-x64.tar.gz /usr/local/tomcat在tomcat目

从MySQL官网找到yum源MySQL官网yum源：mysql80-community-release-el7-3.noarch.rpm下载yum源命令：wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm/get/后面为找到的yum源安装yum源命令：yum localinstall mysql80-community-release-el7-3.noarch.rpm安装完成后如..