Linux Windows系统下安装jdk

1.在Oracle官网下载jdk

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

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2.上传到Linux，/usr/java 目录下

解压：tar -zxvf jdk-8u181-linux-x64.tar.gz
查看是否有默认的jdk：java -version 
openjdk version "1.8.0_102"
OpenJDK Runtime Environment (build 1.8.0_102-b14)
OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)

如果有默认的jdk，建议卸载掉
输入 [root@localhost jvm]# yum remove *openjdk*

修改配置环境 vim /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_181
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export  PATH=${JAVA_HOME}/bin:$PATH

刷新配置文件：source /etc/profile
java -version

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Windows下配置jdk

jdk环境配置：

CLASSPATH=%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar
JAVA_HOME=D:\Java\jdk1.8.0_144
Path=%JAVA_HOME%\bin

mysql5.7安装配置

https://www.cnblogs.com/reyinever/p/8551977.html