centos安装jdk

1.查看是否存在jdk

rpm -qa |grep java和rpm -qa |grep jdk

2.卸载jdk

yum –y remove java java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64

3.上传jdk文件

先看是否有lrzsz工具，没有的话执行yum install lrzsz
使用rz命令上传dk-8u74-linux-x64.tar.gz到/usr/local/jdk目录

4.解压

tar -zxvf jdk-8u74-linux-x64.tar.gz

5.配置环境变量

export JAVA_HOME=/usr/local/jdk/jdk1.8.0_74
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

6.执行profile

source /etc/profile

centos安装jdk

原文：https://www.cnblogs.com/yinchh/p/12381082.html