Centos7 RPM方式安装JDK1.8教程

1. 将jdk的rpm包上传/拷贝到centos系统的某文件夹下（我是放到root目录下）。

[root@i-xevcwzhn java]# cd /root
[root@i-xevcwzhn ~]# ls
jdk-8u221-linux-x64.rpm

2. （在root目录下）rpm -ivh jdk-8u221-linux-x64.rpm 命令安装

[root@i-xevcwzhn ~]# rpm -ivh jdk-8u221-linux-x64.rpm 
warning: jdk-8u221-linux-x64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
Preparing...                                                            (100%)#                                 #### [100%]
Updating / installing...
   1:jdk1.8-2000:1.8.0_221-fcs                                          (  1%)#                                 ############ [100%]
Unpacking JAR files...
tools.jar...
plugin.jar...
javaws.jar...
deploy.jar...
rt.jar...
jsse.jar...
charsets.jar...
localedata.jar...

3. 配置java

打开文件

[root@i-xevcwzhn ~]#vim /etc/profile

在末尾添加

export JAVA_HOME=/usr/local/java/jdk1.8.0_171
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

使环境变量生效

[root@i-xevcwzhn ~]# source /etc/profile

添加软链接

[root@i-xevcwzhn ~]# ln -s /usr/local/java/jdk1.8.0_171/bin/java /usr/bin/java

检查

[root@i-xevcwzhn ~]# java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)