1.参考下载https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
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2.在/usr/目录下创建java

[root@docker ~]# cd /usr/
[root@docker usr]# mkdir java

3.使用xftp把下载的jdk-8u161-linux-x64.tar.gz上传到linux上的/usr/java;

 3.解压JDK安装包：

tar -zxvf  jdk-8u231-linux-x64.tar.gz

4.配置环境变量

root@docker java]# vim /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_231
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

5.使刚更改的环境变量生效

[root@docker java]# source /etc/profile

6.检查jdk8是否安装成功：

[root@docker java]# java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
[root@docker java]#