CentOS6.9安装jdk-8u241-linux-x64.rpm
一、查看是否有默认安装的 rpm -qa | grep jdk
二、如有删除 yum remove xxx
三、官网下载链接 https://www.oracle.com/java/technologies/javase-jdk8-downloads.html
三、上传包文件或使用wget下载 wget https://download.oracle.com/otn/java/jdk/8u241-b07/1f5b5a70bf22433b84d0e960903adac8/jdk-8u241-linux-x64.rpm?AuthParam=1584673542_643474cbde921642fcc2b6aadb27c1d0
四、解压 rpm -ivh jdk-8u241-linux-x64.rpm
五、配置环境变量
1、编辑 vim /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_241-amd64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$path
2、保存 :wq
3、配置生效 source /etc/profile
4、验证 java -version
注意：命令报错：-bash: ls: command not found
解决方法（临时）：
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
path后面追加解决（最终）：
export JAVA_HOME=/usr/java/jdk1.8.0_241-amd64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$path:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
