centos7 安装jdk8 笔记

1. 下载JDK8

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

 

2. 解压到指定目录

tar -zxvf jdk-8u271-linux-x64.tar.gz -C /usr/local/java

 

3. 配置环境变量

vim /etc/profile

#在文件末尾添加以下信息

export JAVA_HOME=/usr/local/java/jdk1.8.0_271
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH　　

(建议$JAVA_HOME/bin写在前面，避免加载的是系统自带的openjdk)

#刷新配置文件

source /etc/profile

 

4. 检查是否安装成功

# 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)