所有安装的都是在c盘根目录
系统变量 CLASS_PATH .;%JAVA_HOME%lib;%JAVA_HOME%lib ools.jar
JAVA_HOME C:Program FilesJavajdk1.8.0_172
M2_HOME C:apache-maven-3.5.0
MYSQL_HOME C:mysql-5.7.21-winx64 C:mysql-5.6.40-winx64
Path ;%M2_HOME%in;%JAVA_HOME%in;%MYSQL_HOME%in