安装JDK

yum install java-1.8.0-openjdk* -y

安装成功

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设置环境变量

centos 通过yum安装Java后，查看Java安装路径

ls -lrt /usr/bin/java 
ls -lrt /etc/alternatives/java

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vi /etc/profile

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在文件最下方粘贴以下内容后保存

注意：JAVA_HOME后面，是你实际的安装路径！

export JAVA_HOME=/usr/lib/jvm/jdk-xxxx/
export JRE_HOME=/usr/lib/jvm/jdk-xxxx/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$PATH

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生效命令：source /etc/profile 
测试命令：java -version

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