关于linux:LINUX安装JDK

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1. 跳转到指定目录（/usr/local/src）

2. 上传 linux 版本的 jdk 到当前目录（/usr/local/src）

3. 解压文件
tar -zxvf jdk-8u51-linux-x64.tar.gz

4. 批改名称为 jdk1.8

5. 配置环境变量

`vim /etc/profile`

 # /etc/profile
  2
  3 # System wide environment and startup programs, for login setup
  4 # Functions and aliases go in /etc/bashrc
  5
  6 # It's NOT a good idea to change this file unless you know what you
  7 # are doing. It's much better to create a custom.sh shell script in
  8 # /etc/profile.d/ to make custom changes to your environment, as this
  9 # will prevent the need for merging in future updates.
 10
 11 pathmunge () {12     case ":${PATH}:" in
 13         *:"$1":*)
 14             ;;
 15         *)
 16             if ["$2" = "after"] ; then
 17                 PATH=$PATH:$1
 18             else
 19                 PATH=$1:$PATH
 20             fi
 21     esac
 22 }
 23
 24
 25 if [-x /usr/bin/id]; then
 26     if [-z "$EUID"]; then
 27         # ksh workaround
 28         EUID=`/usr/bin/id -u`
 29         UID=`/usr/bin/id -ru`
 30     fi
 31     USER="`/usr/bin/id -un`"
 32     LOGNAME=$USER
 33     MAIL="/var/spool/mail/$USER"
 34 fi
 35
 36 # Path manipulation
 37 if ["$EUID" = "0"]; then
 38     pathmunge /usr/sbin
 39     pathmunge /usr/local/sbin
 40 else
 41     pathmunge /usr/local/sbin after
 42     pathmunge /usr/sbin after
 43 fi
 44
 45 HOSTNAME=`/usr/bin/hostname 2>/dev/null`
 46 HISTSIZE=1000
 47 if ["$HISTCONTROL" = "ignorespace"] ; then
 48     export HISTCONTROL=ignoreboth
 49 else
 50     export HISTCONTROL=ignoredups
 51 fi
 52
 53 export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL
 54
 55 # By default, we want umask to get set. This sets it for login shell
 56 # Current threshold for system reserved uid/gids is 200
 57 # You could check uidgid reservation validity in
 58 # /usr/share/doc/setup-*/uidgid file
 59 if [$UID -gt 199] && ["`/usr/bin/id -gn`" = "`/usr/bin/id -un`"]; then
 60     umask 002
 61 else
 62     umask 022
 63 fi
 64
 65 for i in /etc/profile.d/*.sh /etc/profile.d/sh.local ; do
 66     if [-r "$i"]; then
 67         if ["${-#*i}" != "$-" ]; then
 68             . "$i"
 69         else
 70             . "$i" >/dev/null
 71         fi
 72     fi
 73 done
 74
 75 unset i
 76 unset -f pathmunge
 77
 78 #设定 jdk 环境 
 79 export JAVA_HOME=/usr/local/src/jdk1.8
 80 export PATH=$JAVA_HOME/bin:$PATH
 81 export CLASSPATH=.:$JAVA_HOME/lib

若要更改，只需更改 79 行 jdk 的地位即可。（/usr/local/src/jdk1.8）
6. 让环境变量失效
source /etc/profile
7. 验证 jdk 是否装置胜利
java -version

正文完