Java dependency management system Maven

• Maven installation
  Download address: https://maven.apache.org/download.cgiUnzip
  
  to the working directory
  Configure environment variables: MAVEN_HOME, path
  verification: cmd–> mvn -v
  

• Maven project structure and creation method
  First-level directory src is the source code directory
  Second-level directory main / java is the main code directory of the project
  Second-level directory resource directory, yaml file
  Second-level directory test / java is the project test code directory, unit test, test code, etc.
  First-level directory:
  pom.xml file – the maven configuration file that depends on the configuration of the plug-in and other configurations; the project object description file, the properties and method configuration of the project object.
  Exercise for creating Maven project:
  GroupId: company domain name reverse
  Artifactid: project name

• Maven configuration file Settings.xml
  modify the location of the local warehouse: D: \ Program Files (x86) \ apache-maven-3.5.2-bin \ apache-maven-3.5.2 \ repository
  configuration warehouse:
  
  alimaven
  aliyun maven
  http: // maven.aliyun.com/nexus/content/groups/public/
  central
  
  Idea configuration maven: settings–> Maven–> Maven home directory, user settings file

• Analysis of project object file pom.xml

• Common commands

mvn clean  清理项目生产的临时文件，一般是模块下的target目录
mvn package 项目打包工具，会在模块下的target目录生成jar或war等文件
mvn test 测试命令，或执行src/test/java/下Junit的测试用例
mvn install 模块安装命令，将打包的jar/war文件复制到你的本地仓库中，供其他模块使用
mvn install -DskipTests 绕过单元测试直接打包。
mvn deploy 发布命令，丽江打包的文件发布到远程仓库，提供其他人员进行下载依赖，一般是发布到公司的私服。