所需软件包：
        jdk-14.0.2_linux-x64_bin.tar.gz
        hadoop-2.9.2.tar.gz
系统架构：CentOS 7 x64
安装步骤：
1.用WinSCP工具将软件包上传至CentOS7的/root目录下
2.ls查看：

[root@localhost ~]# ls
hadoop-2.9.2.tar.gz  jdk-14.0.2_linux-x64_bin.tar.gz

3.在/usr/local下创建java目录和hadoop目录

mkdir /usr/local/java /usr/local/hadoop

4.将两个软件包分别解压到对应的目录下：

[root@localhost ~]# tar -zxvf ~/jdk-14.0.2_linux-x64_bin.tar.gz -C /usr/local/java
[root@localhost ~]# tar -zxvf ~/hadoop-2.9.2.tar.gz -C /usr/local/hadoop

5.将两个软件的bin目录添加到环境变量中

[root@localhost ~]# vim /etc/profile
##在末尾追加
##JAVA_HOME
export JAVA_HOME=/usr/local/java/jdk-14.0.2
export PATH=$PATH:$JAVA_HOME/bin##HADOOP_HOME
export HADOOP_HOME=/usr/local/hadoop/hadoop-2.9.2
export PATH=$PATH:$HADOOP_HOME/bin

6.使配置生效

[root@localhost ~]# source /etc/profile

7.验证

[root@localhost ~]# java --version
[root@localhost ~]# hadoop version