1、查看jdk是否安装
使用命令rpm -qa|grep jdk或java -version
2、下载到/usr/local目录
[root@192 local]# wget --no-check-certificate --no-cookie --header "Cookie: oraclelicense=accept-securebackup-cookie;" http://download.oracle.com/otn-pub/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/jdk-8u161-linux-x64.tar.gz
3、解压到当前文件
[root@192 local]# tar xvf jdk-8u161-linux-x64.tar.gz
4、导入环境变量,修改/etc/profile文件,文件末尾加入:
[root@192 local]# vim /etc/profile JAVA_HOME=/usr/local/jdk1.8.0_161/ PATH=$JAVA_HOME/bin:$PATH CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export JAVA_HOME export PATH export CLASSPATH [root@192 local]# source /etc/profile
5.查看版本
[root@192 ~]# vim /etc/my.cnf^C [root@192 ~]# service mysqld restart^C [root@192 ~]# java -version java version "1.8.0_161" Java(TM) SE Runtime Environment (build 1.8.0_161-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode) [root@120 ~]#