[LINUX]CentOS7配置jdk环境

[LINUX]CentOS7配置jdk环境

请支持原创，认准DannisTang（tangweixuan1995@foxmail.com）

如果本身linux下装有的java环境，但是没有在配置文件中指定java文件路径，那就会出现用echo找不到安装目录的情况，详情请见我的另一篇文章

使用vi命令编辑profile的文件，在最后一行中添加代码如下

[root@Redhat6 java]# vi /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 /sbin
    pathmunge /usr/sbin
    pathmunge /usr/local/sbin
else
    pathmunge /usr/local/sbin after
    pathmunge /usr/sbin after
    pathmunge /sbin after
fi

HOSTNAME=`/bin/hostname 2>/dev/null`
HISTSIZE=1000
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 2>&1
        fi
    fi
done

unset i
unset -f pathmunge

export MAVEN_HOME=/usr/local/apache-maven-3.5.4
export MAVEN_HOME
export PATH=$PATH:$MAVEN_HOME/bin

export JAVA_HOME=/usr/lib/jvm/java
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export JRE_HOME=$JAVA_HOME/jre
~
"/etc/profile" 88L, 2109C written
[root@Redhat6 java]# source /etc/profile

主要是添加后面的几行

export JAVA_HOME=/usr/lib/jvm/java
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export JRE_HOME=$JAVA_HOME/jre

文件目录一定要指定正确的位置，再用source命令进行执行。这样的话，再使用which就可以进行找到了java的安装路径和echo命令就能找到正确的安装路径了

[root@Redhat6 java]# which java
/usr/lib/jvm/java/bin/java
[root@Redhat6 java]# echo $JAVA_HOME
/usr/lib/jvm/java

请支持原创，认准DannisTang（tangweixuan1995@foxmail.com）