一:基础示例
1.1 安装JDK和Maven
安装openjdk: yum -y install java-1.8.0-openjdk*
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el7_5.x86_64
export MAVEN_HOME =/usr/local/maven3
export PATH=$PATH:$JAVA_HOME/bin:$MAVEN_HOME/bin
source /etc/profile
$ java -version