人生有限，学海无涯jdk安装（rpm安装）1.rpm下载地址为http://www.oracle.com/technet...2.如果你已安装openjdk，卸载[root@jiangwang/]#java-versionjavaversion"1.8.0_121"Java(TM)SERuntimeEnvironment(build1.8.0_121-b13)JavaHotSpot(TM)64-BitServerVM(build25.121-b13,混合模式)#勾选[root@jiangwang/]#rpm-qa|grepjdkjdk1.8.0_121-1.8.0_121-fcs.x86_64#uninstall-e--nodepsforcedelete[root@jiangwang/]#rpm-e--nodepsjdk1.8.0_121-1.8.0_121-fcs。x86_64[root@jiangwang/]#java-version-bash:/usr/bin/java:Nosuchfileordirectory#OK3,安装JDK#installjavarpm[root@jiangwangjiangwang]#rpm-ivhjdk-8u221-linux-x64.rpm警告：jdk-8u221-linux-x64.rpm:HeaderV3RSA/SHA256Signature,keyIDec551f03:NOKEYPreparing...##################################[100%]正在更新/安装...1:jdk1.8-2000:1.8.0_221-fcs##################################[100%]解压JAR文件...tools.jar...plugin.jar...javaws.jar...部署。罐...RT。罐子...jsse.jar...charsets.jar...localedata.jar...[root@jiangwangjiangwang]##安装后配置环境变量文件：/etc/profileJAVA_HOME=/usr/java/jdk1.8.0_221-amd64CLASSPATH=%JAVA_HOME%/lib:%JAVA_HOME%/jre/libPATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/binexportPATHCLASSPATHJAVA_HOME#保存退出#让新的环境变量生效！source/etc/profile#Testjava-version[root@jiangwangjava]#java-versionjavaversion"1.8.0_221"Java(TM)SERuntimeEnvironment(build1.8.0_221-b11)JavaHotSpot(TM)64-BitServerVM（build25.221-b11，混合模式）Tomcat安装（解压安装）1.安装好Java环境后，我们就可以测试Tomcat了！准备Tomcat安装包！（去官网下载）然后将下载的压缩包上传到linux服务器，（这里我是用Xftp上传的）如下图：2.将文件移动到/usr/tomcat/下，解压！[root@jiangwangjiangwang]#mvapache-tomcat-9.0.43.tar.gz/usr/tomcat/[root@jiangwangjiangwang]#cd/[root@jiangwang/]#cdusr/tomcat/[root@jiangwangtomcat]#lsapache-tomcat-9.0.43.tar.gz[root@jiangwangtomcat]#tar-zxvfapache-tomcat-9.0.43.tar.gz#解压3.运行Tomcat，进入bin目录，我们用在Windows下都是一样的#执行：startup.sh-->starttomcat#执行：shutdown.sh-->closetomcat./startup.sh./shutdown.sh[root@jiangwangbin]#./startup.shUsingCATALINA_BASE:/usr/tomcat/apache-tomcat-9.0.43UsingCATALINA_HOME:/usr/tomcat/apache-tomcat-9.0.43使用CATALINA_TMPDIR:/usr/tomcat/apache-tomcat-9.0.43/temp使用JRE_HOME:/usr/java/jdk1.8.0_221-amd64使用CLASSPATH:/usr/tomcat/apache-tomcat-9.0.43/bin/bootstrap.jar:/usr/tomcat/apache-tomcat-9.0.43/bin/tomcat-juli.jarUsingCATALINA_OPTS:Tomcat启动。访问你的浏览器：你的公网ip：80804。确保Linux防火墙端口是开放的。如果是阿里云，需要保证阿里云的安全组策略是开放的！#查看防火墙服务状态systemctlstatusfirewalld#开启、重启、关闭firewalld.serviceservice#开启服务firewalldstart#重启服务firewalldrestart#关闭服务firewalldstop#查看防火墙规则firewall-cmd--list-all#查看所有信息firewall-cmd--list-ports#只看端口信息#打开端口打开端口命令：firewall-cmd--zone=public--add-port=80/tcp--permanent重启防火墙：systemctlrestartfirewalld.service命令含义：--zone#Scope--add-port=80/tcp#添加端口，格式为：端口/通信协议--permanent#永久有效，无此参数重启后失败
