linux 安装 jdk

 1 #官网下载jdk需要登录，用wget不好下
 2 #这个使用window下载jdk的tar，然后用ftp工具传送到linux上
 3 #我将 tar 传送到 /usr/local/java 下
 4 #解压
 5 [root@k8s-master java]# tar -zxvf jdk-8u241-linux-x64.tar.gz
 6 [root@k8s-master java]# ls
 7 jdk1.8.0_241  jdk-8u241-linux-x64.tar.gz
 8 
 9 #配置环境变量
10 
11 
12 [root@k8s-master java]# vi  ~/.bash_profile
13 
14 #添加配置内容
15 export JAVA_HOME=/usr/local/java/jdk1.8.0_241
16 export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
17 
18 export PATH=$PATH:$JAVA_HOME/bin
19 #查看配置文件
20 [root@k8s-master java]# cat ~/.bash_profile
21 # .bash_profile
22 
23 # Get the aliases and functions
24 if [ -f ~/.bashrc ]; then
25     . ~/.bashrc
26 fi
27 
28 # User specific environment and startup programs
29 
30 PATH=$PATH:$HOME/bin
31 
32 
33 export JAVA_HOME=/usr/lib/java/jdk1.8.0_241
34 export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
35 
36 export PATH=$PATH:$JAVA_HOME/bin
37 export PATH
38 
39 #使配置文件生效
40 [root@k8s-master java]# source ~/.bash_profile
41 
42 #查看版本
43 [root@k8s-master java]# java -version
44 java version "1.8.0_241"
45 Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
46 Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)
如果要删除linux自带openjdk: https://blog.csdn.net/cyl1226541/article/details/78849499