1.在/usr/local下面下载maven安装包：
wget http://apache.opencas.org/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
2.解压maven安装包
mkdir /usr/local/maven
tar -zxvf apache-maven-3.3.9-bin.tar.gz -C /usr/local/maven/
3.配置环境变量
vi /etc/profile
MAVEN_HOME=/usr/local/maven/apache-maven-3.3.9
export MAVEN_HOME
PATH=$MAVEN_HOME/bin:$PATH
export PATH
4.编译环境变量
source /etc/profile
5.验证是否成功
mvn -version