ubuntu20.04安装jdk
⼀ jdk
1.1 下载jdk
~# wget acle/java/17/latest/jdk-17_linux-x64_
1.2 安装jdk
~# tar xf jdk-17_linux-x64_ -C /usr/local/
~# ln -sv /usr/local/jdk-17.0.1/ /usr/local/jdk
'/usr/local/jdk' -> '/usr/local/jdk-17.0.1/'
1.3 设置环境变量
~# cat /etc/profile
export JAVA_HOME=/usr/local/jdk
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=.$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar
1.4 验证版本信息
~# java --version
java 17.0.1 2021-10-19 LTS
Java(TM) SE Runtime Environment (build 17.0.1+12-LTS-39)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.1+12-LTS-39, mixed mode, sharing)
⼆ openjdk
2.1 下载openjdk
~# wget download.java/java/GA/jdk17.0.1/2a2082e5a09d4267845be086888add4f/12/GPL/openjdk-17.0.1_linux-x64_ 2.2 安装openjdk
~# tar xf openjdk-17_linux-x64_ -C /usr/local/
~# ln -sv /usr/local/jdk-17.0.1/ /usr/local/jdk
'/usr/local/jdk' -> '/usr/local/jdk-17.0.1/'
虚拟机linux安装jdk2.3 设置环境变量
~# cat /etc/profile
export JAVA_HOME=/usr/local/jdk
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=.$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar
2.4 验证版本信息
~# java -version
openjdk version "17.0.1" 2021-10-19
OpenJDK Runtime Environment (build 17.0.1+12-39)
OpenJDK 64-Bit Server VM (build 17.0.1+12-39, mixed mode, sharing)

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