CentOs安装jdk

 教程备注

 

cd /data/java

 

cp jdk-8u161-linux-x64.tar.gz /usr/local/src/

 

 

修改文件权限

chmod 755 jdk-8u161-linux-x64.tar.gz

 

ls -al

 

解压文件

tar -zxvf jdk-8u161-linux-x64.tar.gz

 

删除jdk压缩包

rm -f jdk-8u161-linux-x64.tar.gz

 

配置环境变量

vim /etc/profile

 

文件：

============================================================

# /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 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

if [ $UID -gt 199 ] && [ "`/usr/bin/id -gn`" = "`/usr/bin/id -un`" ]; then

umask 002

else

umask 022

fi

 

for i in /etc/profile.d/*.sh ; do

if [ -r "$i" ]; then

if [ "${-#*i}" != "$-" ]; then

. "$i"

else

. "$i" >/dev/null

fi

fi

done

 

unset i

unset -f pathmunge

============================================================

【注】：CentOS6上面的是JAVAHOME，CentOS7是{JAVA_HOME}

 

#java environment

export JAVA_HOME=/home/java/jdk1.8.0_161/

export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar

export PATH=$PATH:${JAVA_HOME}/bin

 

 

键盘：

 

ESC

 

shift+q / x

 

①让刚刚设置的环境变量生效

 

键入：

 

source /etc/profile

source /etc/profile或 . /etc/profile

 

②检查是否配置成功

 

键入：

 

java -version