实例：安装oracle官⽅JDK 官⽅下载链接:
Oracle JDK 的 rpm安装
[root@centos8 ~]#ls -lh jdk-8u241-linux-x64.rpm
-rw-r--r-- 1 root root 171M Feb 8 18:29 jdk-8u241-linux-x64.rpm
#安装jdk，⽆相关依赖包
[root@centos8 ~]#dnf -y install jdk-8u241-linux-x64.rpm
[root@centos8 ~]#java -version
java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)
#初始化环境变量
[root@centos8 ~]#vim /etc/profile.d/jdk.sh
[root@centos8 ~]#cat /etc/profile.d/jdk.sh
export JAVA_HOME=/usr/java/default
export PATH=$JAVA_HOME/bin:$PATH
#以下两项⾮必须项
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib/:$JRE_HOME/lib/
[root@centos8 ~]#. /etc/profile.d/jdk.sh
#查看jdk信息
[root@centos8 ~]#which java
/usr/bin/java
[root@centos8 ~]#ll /usr/bin/java
lrwxrwxrwx 1 root root 22 Feb 8 18:35 /usr/bin/java -> /etc/alternatives/java
[root@centos8 ~]#ll /etc/alternatives/java
lrwxrwxrwx 1 root root 41 Feb 8 18:35 /etc/alternatives/java ->
/usr/java/jdk1.8.0_241-amd64/jre/bin/java
[root@centos8 ~]#rpm -q --scripts jdk-8u241-linux-x64.rpm
#查看到安装⽬录为/user/java下
[root@centos8 ~]#rpm -ql jdk-8u241-linux-x64.rpm |less
warning: jdk-8u241-linux-x64.rpm: Header V3 RSA/SHA256 Signature, key ID
ec551f03: NOKEY
/usr
/
usr/java
/usr/java/jdk1.8.0_241-amd64
/usr/java/jdk1.8.0_241-amd64/.java
/usr/java/jdk1.8.0_241-amd64/.java/.systemPrefs
/usr/java/jdk1.8.0_241-amd64/.java/.systemPrefs/.system.lock
/usr/java/jdk1.8.0_241-amd64/.java/.systemPrefs/.systemRootModFile
/usr/java/jdk1.8.0_241-amd64/.java/init.d
......
[root@centos8 ~]#ll /usr/java/
total 0
lrwxrwxrwx 1 root root 16 Feb 8 18:35 default -> /usr/java/latest
drwxr-xr-x 8 root root 258 Feb 8 18:35 jdk1.8.0_241-amd64
lrwxrwxrwx 1 root root 28 Feb 8 18:35 latest -> /usr/java/jdk1.8.0_241-amd64 Oracle JDK的⼆进制⽂件安装
[root@centos8 ~]#tar xvf -C /usr/local/
[root@centos8 ~]#cd /usr/local/
[root@centos8 ~]#ln -s jdk1.8.0_241/ jdk
#初始化环境变量
[root@centos8 ~]#vim /etc/profile.d/jdk.sh
[root@centos8 ~]#cat /etc/profile.d/jdk.sh
export JAVA_HOME=/usr/local/jdk
export PATH=$PATH:$JAVA_HOME/bin
#以下两项⾮必须项
jdk下载具体步骤
#export JRE_HOME=$JAVA_HOME/jre
#export CLASSPATH=$JAVA_HOME/lib/:$JRE_HOME/lib/
[root@centos8 ~]#. /etc/profile.d/jdk.sh
#注意:JAVA_HOME变量必须设置，否则tomcat启动时会出下⾯错误
[root@centos8 ~]#catalina.sh
Neither the JAVA_HOME nor the JRE_HOME environment variable is defined At least one of these environment variable is needed to run this program
[root@centos8 ~]#startup.sh
Neither the JAVA_HOME nor the JRE_HOME environment variable is defined At least one of these environment variable is needed to run this program
#验证安装
[root@centos8 ~]#java -version
java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)
[root@centos8 ~]#which java
/usr/local/jdk/bin/java
脚本⼀键安装⼆进制的JDK
DIR=pwd
JDK_FILE=""
JDK_DIR="/usr/local"
color () {
RES_COL=60
MOVE_TO_COL="echo -en \033[${RES_COL}G"
SETCOLOR_SUCCESS="echo -en \033[1;32m"
SETCOLOR_FAILURE="echo -en \033[1;31m"
SETCOLOR_WARNING="echo -en \033[1;33m"
SETCOLOR_NORMAL="echo -en \E[0m"
echo -n "$2" && $MOVE_TO_COL
echo -n "["
if [ $1 = "success" -o $1 = "0" ] ;then
${SETCOLOR_SUCCESS}
echo -n $" OK "
elif [ $1 = "failure" -o $1 = "1" ] ;then
${SETCOLOR_FAILURE}
echo -n $"FAILED"
else
${SETCOLOR_WARNING}
echo -n $"WARNING"
fi
${SETCOLOR_NORMAL}
echo -n "]"
echo
}
install_jdk(){
if ! [  -f "$DIR/$JDK_FILE" ];then
color 1  "$JDK_FILE ⽂件不存在"
exit;
elif [ -d $JDK_DIR/jdk ];then
color 1  "JDK 已经安装"
exit
else
[ -d "$JDK_DIR" ] || mkdir -pv $JDK_DIR
fi
tar xvf $DIR/$JDK_FILE  -C $JDK_DIR
cd  $JDK_DIR && ln -s jdk1.8.* jdk
cat > /etc/profile.d/jdk.sh <<EOF
export JAVA_HOME=$JDK_DIR/jdk
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib/:$JRE_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin
EOF
. /etc/profile.d/jdk.sh
java -version && color 0  "JDK 安装完成" || { color 1  "JDK 安装失败" ; exit; } }
install_jdk

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