linux环境下安装JDK

1.下载jdk

可以从ORACLE官网中找到 JDK下载地址(需要登录)

wget -O jdk-8u271-linux-x64.tar.gz https://download.oracle.com/otn/java/jdk/8u271-b09/61ae65e088624f5aaa0b1d2d801acb16/jdk-8u271-linux-x64.tar.gz?AuthParam=1609127582_5bb9de5dd9c79c8413dcead9899e456b

2.解压缩

tar -zxvf jdk-8u271-linux-x64.tar.gz    (x表示解压  z表示gz包，v显示解压过程，f表示解压名称)

3.修改profile

vi /etc/profile

添加内容

export JAVA_HOME=/opt/myprogram/jdk1.8.0_271
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib

4.使profile生效

source /etc/profile

5.测试java -version

[root@VM-0-7-centos soft]# java -version
java version "1.8.0_271"
Java(TM) SE Runtime Environment (build 1.8.0_271-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.271-b09, mixed mode)