centos jdk安装

rpm -qa | grep java

rpm -e --nodeps java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.252.b09-2.el7_8.x86_64
rpm -e --nodeps python-javapackages-3.4.1-11.el7.noarch
rpm -e --nodeps javapackages-tools-3.4.1-11.el7.noarch
rpm -e --nodeps tzdata-java-2019c-1.el7.noarch
rpm -e --nodeps java-1.8.0-openjdk-devel-1.8.0.252.b09-2.el7_8.x86_64

tar -zxvf jdk-8u181-linux-x64.tar.gz

创建文件夹
mkdir /usr/java
移动文件
mv ./jdk1.8.0_181/ /usr/java

vim /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_181
export JRE_HOME=/usr/java/jdk1.8.0_181/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

使配置生效
source /etc/profile