CentOS 7/8 安装JDK8

# 创建目录
mkdir /usr/local/java

# 下载JDK并上传到/usr/local/java

# https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

# 解压缩
cd /usr/local/java
tar -zxvf jdk-8u261-linux-x64.tar.gz


# 设置环境变量
vim /etc/profile

# 在文件最后添加以下内容
export JAVA_HOME=/usr/local/java/jdk1.8.0_261
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH

# 设置立即生效
source /etc/profile

# 验证
java -version