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