一. 流程
1. 官网下载JDK
2. 解压缩,放到指定目录
3. 配置环境变量
4. 设置系统默认JDK
5. 测试jdk
二. 步骤
1. 官网下载JDK(下载jdk8为例)
https://www.oracle.com/technetwork/articles/javase/index-jsp-138363.html
2. 解压缩,放到指定目录
sudo mkdir /usr/lib/java
sudo tar -zxvf jdk-8u221-linux-x64.tar.gz
mv jdk1.8.0_221 /usr/lib/java
3. 配置环境变量
sudo vim ~/.bashrc
文件的末尾追加下面内容:
#set oracle jdk environment
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_221 ## 这里要注意目录要换成自己解压的jdk 目录 export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
使环境变量生效
source ~/.bashrc
4. 设置为默认的JDK
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8.0_221/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.8.0_221/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.8.0_221/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/jdk1.8.0_221/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk1.8.0_221/bin/javap 300
5. 测试JDK
java -version
root@root ~ # java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)
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