Linux(一) Linux 系统安装jdk

需要工具xshell6 和Xftp6

一、下载jdk

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
进入页面后下载64位的包

二、用Xshell6 点击图片中的Xftp6

三、建立一个文件夹software（代表软件）把刚刚下载好的jdk压缩包上传到这个文件夹下

四、解压缩并移动到指定目录

#解压缩

tar -zxvf jdk-8u221-linux-x64.tar.gz

创建目录

mkdir -p /usr/local/java

移动安装包

mv jdk1.8.0_221/ /usr/local/java/

设置所有者

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

配置环境变量

#配置系统环境变量

vi /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

 vi  /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_152
export JRE_HOME=/usr/local/java/jdk1.8.0_152/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

root@UbuntuBase:/usr/local/java# java -version
java version "1.8.0_152"
Java(TM) SE Runtime Environment (build 1.8.0_152-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)

#为其他用户更新用户环境变量

su lusifer
source /etc/profile