安装jdk步骤rpm_Centos7-卸载自带的jdk，安装jdk8

向右看齐 2023-01-06 15:51 257阅读 0赞

# **一、卸载JDK** #

Centos7一般都会带有自己的openjdk,我们一般都回用oracle的jdk,所以要卸载

步骤一：查询系统是否以安装jdk

> \[root@cmp4 jdk1.8.0\_171\]\# yum list installed |grep java

![7b20a3afa3d17f6263d09b90372e00ca.png][]

或者：

> \#rpm -qa|grep java
> 
> \#rpm -qa|grep jdk
> 
> \#rpm -qa|grep gcj

步骤二：依次卸载上图中已安装的jdk：

> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.6.0-openjdk.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.6.0-openjdk-devel.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.7.0-openjdk.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.7.0-openjdk-devel.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.7.0-openjdk-headless.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.8.0-openjdk.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.8.0-openjdk-devel.x86\_64
> 
> \[root@cmp4 jdk1.8.0\_171\]\# rpm -e --nodeps java-1.8.0-openjdk-headless.x86\_64

步骤三：验证一下是还有jdk

> \#rpm -qa|grep java
> 
> \#rpm -qa|grep jdk
> 
> \#rpm -qa|grep gcj

![d4eb9b126637d5ee37eeb67532c6ab3b.png][]

# **二、安装JDK8**  #

步骤一：到官网下载jdk并上传到/opt 目录下，并解压：

> \[root@cmp4 opt\]\# unzip jdk8u202x64.zip
> 
> \[root@cmp4 opt\]\# unzip jdk-8u211-linux-x64.tar.gz.zip
> 
> \[root@cmp4 opt\]\# tar -xvf jdk-8u211-linux-x64.tar.gz

![10257e93bfa81b2a4c0833bbbd19a4f2.png][]

步骤二：配置profile

> \[root@cmp4 usr\]\# vim /etc/profile

增加如下内容：

> export JAVA\_HOME=/opt/jdk1.8.0\_211
> 
> export CLASSPATH=.:$JAVA\_HOME/lib/dt.jar:$JAVA\_HOME/lib/tools.jar
> 
> export PATH=$JAVA\_HOME/bin:$PATH

步骤三：刷新profile

> \[root@cmp4 usr\]\# source /etc/profile

步骤四：检查java是否完成

> \[root@cmp4 usr\]\# java -version

![ae0c7f2f3c731c8ece0fbe593271a1c6.png][]

【完】

[7b20a3afa3d17f6263d09b90372e00ca.png]: /images/20221119/b573a68f9bb942f79bebb2e670d5a314.png
[d4eb9b126637d5ee37eeb67532c6ab3b.png]: https://img-blog.csdnimg.cn/img_convert/d4eb9b126637d5ee37eeb67532c6ab3b.png
[10257e93bfa81b2a4c0833bbbd19a4f2.png]: https://img-blog.csdnimg.cn/img_convert/10257e93bfa81b2a4c0833bbbd19a4f2.png
[ae0c7f2f3c731c8ece0fbe593271a1c6.png]: https://img-blog.csdnimg.cn/img_convert/ae0c7f2f3c731c8ece0fbe593271a1c6.png