CentOS7卸载OpenJDK，并安装Oracle官方JDK
一、准备工具
- yum源挂载已就绪；CentOS7本地yum源挂载。
- jdk-8u201-linux-x64.tar.gz,JDK安装包；
- 注意：在Linux配置JDK版本要求_jdk1.8+;
二、卸载CentOS7自带的OpenJDK
- 进入root用户下；
![L}6O{{PP]IHT2IF@B]]VS@P](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022754756-1736165417.png "L}6O{{PP]IHT2IF@B]]VS@P")
- 卸载OpenJDK,Complete;
- 删除OpenJDK安装目录；
![L}6O{{PP]IHT2IF@B]]VS@P](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022754204-1901511723.png "L}6O{{PP]IHT2IF@B]]VS@P")
三、安装OracleJDK;
- 使用Xshell等工具将压缩包上传到Linux，并解压JDK源码包；
- 将解压后的文件移动到本地安装目录；
![AC@_6]65]7IWGM`4(Z`T1FK](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022759855-1167505849.png "AC@_6]65]7IWGM`4(Z`T1FK")
- 添加环境变量，并使生效；
![G5@Z)PE5})(L]JRN4V%]QTT](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022801067-1225610035.png "G5@Z)PE5})(L]JRN4V%]QTT")
- 验证JDK安装是否成功，切换到普通用户下，刷新环境变量；
![C2A1V~$P2KLJV_D4K]@(A`X](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022802781-1716267020.png "C2A1V~$P2KLJV_D4K]@(A`X")
- 查看Java版本能得出如上图所示的结果，表明OracleJDK安装成功；
![AC@_6]65]7IWGM`4(Z`T1FK](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022759209-849365373.png "AC@_6]65]7IWGM`4(Z`T1FK")
![G5@Z)PE5})(L]JRN4V%]QTT](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022800309-52357508.png "G5@Z)PE5})(L]JRN4V%]QTT")
export JAVA_HOME=/usr/local/jdk
export PATH=$PATH:$JAVA_HOME/bin![C2A1V~$P2KLJV_D4K]@(A`X](https://img2018.cnblogs.com/blog/1469176/201903/1469176-20190326022802098-1594329268.png "C2A1V~$P2KLJV_D4K]@(A`X")
