jdk安装

jdk官网下载地址

jdk历史版本下载地址

1.解压缩包

tar xf jdk-8u211-linux-x64.tar.gz -C /usr/local

2.导出环境变量

cat >>/etc/profil <<'EOF'
export JAVA_HOME=/usr/local/jdk1.8.0_211
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre:$JAVA_HOME/lib:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME PATH CLASSPATH
EOF

3.使配置生效

source /etc/profile

4.查看版本

$ java -version
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)