In the previous section, we talked about the installation and configuration of Maven, and in this section we'll learn to create a simple MAVEN project
1. Create a simple MAVEN project with the MAVEN command
Run the following command in CMD: C code mvn archetype:generate-dgroupid=com.mycompany.app-dartifactid=my-app-simple-dversion=1.0 -darchetypeartifactid=maven-archetype-quickstart
MVN archetype:generate
-dgroupid=com.mycompany.app
-dartifactid=my-app-simple
-dversion=1.0
- Darchetypeartifactid=maven-archetype-quickstart
You can create a simple MAVEN project in the current directory and, of course, create it by downloading the dependencies from the Maven library and patiently waiting.
The general structure of MAVEN is as follows: Java code my-app |-- pom.xml '-- src & Nbsp; |-- main | |-- java | | '-- com | | '-- mycompany | | '-- app | | '-- app.java | '-- resources | '-- Meta-inf | '--&Nbsp;application.properties '-- test '-- java '-- com '-- mycompany '-- app '-- apptest.java
My-app |
| pom.xml '--src |--
main
| | --java
| | '--com
| | '--mycompany
| | '--app
| | '--App.java
| '--Resources
| '--Meta-inf
| '--application.properties
'--Test
'--Java
'--com
'--mycompany
'--app
'-- Apptest.java
Src/main/java : Java source file storage location
Src/main/resource : Resource resources, such as configuration files, etc.
src/test/java : Test code source file storage location
2. Simple Pom.xml
Open Project to see Pom.xml XML code<projectxmlns= "http://maven.apache.org/POM/4.0.0" xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xsi: schemalocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><groupId>Com.mycompany.app</groupId><artifactId>My-app-simple</artifactId><packaging>Jar</packaging><version>1.0</version><name>My-app-simple</name><url>http://maven.apache.org</url><dependencies><dependency><groupId>Junit</groupId><artifactId>Junit</artifactId> <version>3.8.1</version><scope>Test</scope></dependency></dependencies></project>
<project xmlns= "http://maven.apache.org/POM/4.0.0" xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"
xsi:schemalocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd" >
< modelversion>4.0.0</modelversion>
<groupId>com.mycompany.app</groupId>
< artifactid>my-app-simple</artifactid>
<packaging>jar</packaging>
<version> 1.0</version>
<name>my-app-simple</name>
<url>http://maven.apache.org</url >
<dependencies>
<dependency>
<groupId>junit</groupId>
< artifactid>junit</artifactid>
<version>3.8.1</version>
<scope>test</ scope>
</dependency>
</dependencies>
</project>
The most important part of this code is the three lines that contain GroupID, Artifactid, and version. These three elements define the basic coordinates of a project
groupId defines which group the project belongs to, and this group is often associated with the organization or company where the project is located. For example, a project called MyApp was established on the Googlecode, then GroupID should be Com.googlecode.myapp
Artifactid defines the unique ID of the current MAVEN project in the organization, which can be understood as the module in the project, and the module is the smallest unit component in Maven
versions of version projects
3. Run the simple maven command
We've created the simplest MAVEN project, so let's do some simple build commands
compiling: Compile
In cmd, switch directories to my-app-simple and perform mvn clean compile
After build success, we'll see a new target directory under My-app-simple that holds the compiled files for the project, such as. class files
Cleaning: Clean
CMD directory my-app-simple execute command mvn clean
Deletes the target file, which is the cleanup project, which can be run with other commands
Testing: Test
CMD directory my-app-simple execute command MVN test
will perform the JUnit test code under Src/test/java
Of course, the compilation command is executed automatically before the test is executed, and the results are as follows:
Packing: Package
CMD directory my-app-simple execute command MVN package
The project is made into a jar package and placed in the target directory
Compile and test commands are executed before executing this command
Installation: Install
CMD directory my-app-simple execute command mvn install
The project jar package is installed in the local warehouse so that other projects can use
The compile, test, Package command is executed before executing this command