CentOS 安装Java

检查是否安装

yum list installed | grep java

卸载自带Java

yum -y remove java-1.8.0-openjdk*
yum -y remove tzdata-java*

查看库里的Java

yum -y list java*

安装Java

yum -y install java-1.8.0-openjdk*

查找Java安装路径

which java
ls -lrt /usr/bin/java
ls -lrt /etc/alternatives/java
cd /usr/lib/jvm

配置环境变量

vim /etc/profile
export JAVA_HOME=/usr/lib/jvm/java-1.8.0
export JRE_HOME=$JAVA_HOME/jre  
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib