Linux 安装 Java

一、解压缩并移动到指定目录

解压缩

tar -zxvf jdk-8u152-linux-x64.tar.gz1

创建目录

mkdir -p /usr/local/java1

移动安装包

mv jdk1.8.0_152/ /usr/local/java/

设置所有者

chown -R root:root /usr/local/java/

二、配置环境变量

配置系统环境变量

nano /etc/environment

添加如下语句

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
export JAVA_HOME=/usr/local/java/jdk1.8.0_152
export JRE_HOME=/usr/local/java/jdk1.8.0_152/jre
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib

配置用户环境变量

nano /etc/profile

添加如下语句

if [ "$PS1" ]; then
if [ "$BASH" ] && [ "$BASH" != "/bin/sh" ]; then
# The file bash.bashrc already sets the default PS1.
# PS1='\h:\w\$ '
if [ -f /etc/bash.bashrc ]; then
. /etc/bash.bashrc
fi
else
if [ "`id -u`" -eq 0 ]; then
PS1='# '
else
PS1='$ '
fi
fi
fi


export JAVA_HOME=/usr/local/java/jdk1.8.0_251
export JRE_HOME=/usr/local/java/jdk1.8.0_251/jre
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOME/bin

if [ -d /etc/profile.d ]; then
for i in /etc/profile.d/*.sh; do
if [ -r $i ]; then
. $i
fi
done
unset i
fi

使用户环境变量生效

source /etc/profile

测试是否安装成功