centos7 安装jdk1.8 并配置环境变量

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我是把压缩包放在了 /usr/local/src 这个空文件夹下 可以自行选择
连接服务器
cd /usr/local/src
此时能看到我们存放的压缩包

解压安装

tar -zxvf  (压缩包名称)

解压后能看到

jdk1.8.0_161

此时解压已经完成

配置环境变量

vim / etc/profile 编辑文件

[root@VM_0_9_centos jdk1.8.0_161]# vim /etc/profile
[root@VM_0_9_centos jdk1.8.0_161]# vim /etc/profile

# /etc/profile

# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc

# It's NOT a good idea to change this file unless you know what you
# are doing. It's much better to create a custom.sh shell script in
# /etc/profile.d/ to make custom changes to your environment, as this
# will prevent the need for merging in future updates.

pathmunge () {
    case ":${PATH}:" in
        *:"$1":*)
            ;;
        *)
            if [ "$2" = "after" ] ; then
                PATH=$PATH:$1
            else
                PATH=$1:$PATH
            fi
    esac
}


if [ -x /usr/bin/id ]; then
    if [ -z "$EUID" ]; then
        # ksh workaround
        EUID=`/usr/bin/id -u`
        UID=`/usr/bin/id -ru`
    fi
    USER="`/usr/bin/id -un`"
    LOGNAME=$USER
    MAIL="/var/spool/mail/$USER"
fi

# Path manipulation
if [ "$EUID" = "0" ]; then
    pathmunge /usr/sbin
    pathmunge /usr/local/sbin
else
    pathmunge /usr/local/sbin after
    pathmunge /usr/sbin after
fi

HOSTNAME=`/usr/bin/hostname 2>/dev/null`
if [ "$HISTCONTROL" = "ignorespace" ] ; then
    export HISTCONTROL=ignoreboth
else
    export HISTCONTROL=ignoredups
fi

export JAVA_HOME=/usr/local/src/jdk1.8.0_161
export CLASSPATH=$JAVA_HOME/lib:$JAVA_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH
export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL

# By default, we want umask to get set. This sets it for login shell
# Current threshold for system reserved uid/gids is 200
# You could check uidgid reservation validity in
# /usr/share/doc/setup-*/uidgid file

按 i 键 进行编辑添加
路径修改成自己的安装路径

  export JAVA_HOME=/usr/local/src/jdk1.8.0_161
  export CLASSPATH=$JAVA_HOME/lib:$JAVA_HOME/lib
  export PATH=$JAVA_HOME/bin:$PATH

然后 esc 退出
shift+:
wq 保存退出

此时环境变量还未生效
生效命令:

source /etc/profile

然后在任意地方

[root@VM_0_9_centos /]# java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode

看到如下信息就配置成功了