Centos7安装配置jdk1.8

1、获取jdk1.8安装包，上传到服务器，后续放置在/usr/local/java目录下
[root@localhost ~]# mkdir /usr/local/java
[root@localhost ~]# cd /usr/local/java

2、解压
[root@localhost java]# tar -zxvf jdk-8u341-linux-x64.tar.gz

3、配置环境变量
[root@localhost java]# vi /etc/profile

#JAVA环境变量
export JAVA_HOME=/usr/local/java/jdk1.8.0_341
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

4、生效
[root@localhost java]# source /etc/profile

5、查验
[root@localhost java]# java -version

报错：

which: no java in (/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/geoscene/.local/bin:/home/geoscene/bin)

ERROR: Could not locate Java in path.

把JAVA_HOME下的bin/java，软连接到/usr/bin/java（本次还授予了/home/geoscene/jdk1.8.0_341，，777权限）

[root@geoenterprise geoscene]# ln -s /home/geoscene/jdk1.8.0_341/bin/java /usr/bin/java