ubuntu16.04安装java环境

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1.首先官网下载安装包，地址如下
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
2.解压

tar -zxvf jdk-8u191-linux-x64.tar.gz -C /usr/local/java/

3.配置系统环境

vim /etc/profile

在最后一行添加如下配置

export JAVA_HOME=/usr/local/java/jdk1.8.0_191
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

4.使环境生效

source /etc/profile

5.测试

echo $JAVA_HOME
javac -version