注意修改环境变量后需要重启后才能生效
提示:安装GCC时把编译Java的选项勾选掉
(否则它的优先级会高于自配的JDK,不安装GCC就不用管它了).修改配置后重启
过程如下:
1. 先从网上下载jdk(jdk-1_5_0_02-linux-i586.rpm),放在/home目录中
进入安装目录
#cd /home
#cp jdk-1_5_0_02-linux-i586.rpm /usr/local
#cd /usr/local
给所有用户添加可执行的权限
#chmod +x jdk-1_5_0_02-linux-i586.rpm.bin
#./jdk-1_5_0_02-linux-i586.rpm.bin
此时会生成文件jdk-1_5_0_02-linux-i586.rpm,同样给所有用户添加可执行的权限
#chmod +x jdk-1_5_0_02-linux-i586.rpm
安装程序
#rpm -ivh jdk-1_5_0_02-linux-i586.rpm
出现安装协议等,按接受即可。
2.设置环境变量。
#vi /etc/profile
在最后面加入
#set java environment
export JAVA_HOME=/usr/java/jdk-1_5_0_02
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
:$JAVA_HOME/lib/mysql-connector-java-3.2.0.jar:$JAVA_HOME/lib/classes12.jar
export PATH=$PATH:$JAVA_HOME/bin
export JRE_HOME=$JAVA_HOME/jre
保存退出。
# source /etc/profile 使环境变量生效
# set
要使JDK在所有的用户中使用,可以这样:
vi /etc/profile.d/java.sh
在新的java.sh中输入以下内容:
#set java environment
JAVA_HOME=/usr/java/jdk-1_5_0_02
CLASSPATH=.:$JAVA_HOME/lib/tools.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH
保存退出,然后给java.sh分配权限:chmod 755 /etc/profile.d/java.sh
3.在终端使用echo命令检查环境变量设置情况。
#echo $JAVA_HOME
#echo $CLASSPATH
#echo $PATH
4.检查JDK是否安装成功。
#java -version
jdk-6u31-linux-i586.bin
vi /etc/profile
JAVA_HOME=/root/jdk1.6.0_31
PATH=$PATH:$JAVA_HOME/BIN:$JAVA_HOME/jre/bin
CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH
export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC JAVA_HO
ME CLASSPATH
java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) Client VM (build 20.6-b01, mixed mode, sharing)
# /etc/profile
# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc
pathmunge () {
if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
if [ "$2" = "after" ] ; then
PATH=$PATH:$1
else
PATH=$1:$PATH
fi
fi
}
# Path manipulation
if [ `id -u` = 0 ]; then
pathmunge /sbin
pathmunge /usr/sbin
pathmunge /usr/local/sbin
fi
pathmunge /usr/X11R6/bin after
unset pathmunge
# No core files by default
ulimit -S -c 0 > /dev/null 2>&1
USER="`id -un`"
LOGNAME=$USER
MAIL="/var/spool/mail/$USER"
HOSTNAME=`/bin/hostname`
HISTSIZE=1000
if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ]; then
INPUTRC=/etc/inputrc
fi
JAVA_HOME=/root/jdk1.6.0_31
PATH=$PATH:$JAVA_HOME/BIN:$JAVA_HOME/jre/bin
CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH
export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC JAVA_HO
ME CLASSPATH
for i in /etc/profile.d/*.sh ; do
if [ -r "$i" ]; then . $iVA_HOME=/root/jdk1.6.0_31
PATH=$PATH:$JAVA_HOME/BIN:$JAVA_HOME/jre/bin
CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH
export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC JAVA_HO
ME CLASSPATH
fi
done
unset i