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  • Linux 设置 Java 环境变量

    Linux 设置 Java 环境变量


    1、编辑 /etc/profile

    命令如下:

    vi /etc/profile

    在文件最后添加如下内容:

    # /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`
    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
            fi
        fi
    done
    
    unset i
    unset -f pathmunge
    
    export JAVA_HOME=/usr/local/jdk1.8.0_191
    export JRE_HOME=$JAVA_HOME
    export PATH=$JAVA_HOME/bin:$PATH
    export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar

    (备注:红色字体是新增的部分,jdk的路径根据实际情况进行修改)

    效果如下:

    2、使 /etc/profile 生效

    命令如下:

    source /etc/profile

    3、验证

    1)查看JDK版本

    命令如下:

    java -version

    2)验证 javac 命令

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  • 原文地址:https://www.cnblogs.com/miracle-luna/p/13887871.html
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