centos7源碼安裝java1.8
0）刪除之前rpm安裝的openjdk
rpm -qa | grep java
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
1）下載linux版jdk1.8的jar包
官網下載： https://www.oracle.com/java/technologies/javase-jdk8-downloads.html
csdn下載：https://download.csdn.net/download/inthat/12326661
2）配置安裝
tar -zxvf jdk-8u241-linux-x64.tar.gz
mv jdk1.8.0_241/ /opt/
vim /etc/profile
在文本的最後一行粘貼如下
#java environment
export JAVA_HOME=/opt/jdk1.8.0_241
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
生效配置 運行
source /etc/profile
java -version