CentOS下安装jdk1.8

Linux下卸载openjdk，安装jdk
1.查看java版本
java -version
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-b10)
OpenJDK 64-Bit Server VM (build 25.171-b10, mixed mode)
　
2.查看java安装软件
rpm -qa|grep java
tzdata-java-2018e-3.el7.noarch
java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64
java-1.7.0-openjdk-headless-1.7.0.181-2.6.14.8.el7_5.x86_64
java-1.7.0-openjdk-1.7.0.181-2.6.14.8.el7_5.x86_64
javapackages-tools-3.4.1-11.el7.noarch
python-javapackages-3.4.1-11.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.171-8.b10.el7_5.x86_64

3.卸载openjdk
noarch可以不用删除
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.101-3.b13.el7_2.x86_64
　　

4.上传jdk包

官网下载jdk包，上传到服务器上

5.解压

tar -vzxf jdk-8u191-linux-x64.tar.gz

6.设置环境变量

vim /etc/profile
#java
export JAVA_HOME=/data/jdk1.8.0_221
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib

保存退出，执行

source /etc/profile

7.测试
java -version