Maven for project construction: 2. HelloWorld Project Construction Process

File structure description:

Project Build lifecycle:

Clear

Compile

Test

Package

Run

Deployment

Cleaning and compilation

Hello \ pom. xml

POM: Project Object Model, Project Object Model

Pom. xml is similar to ant build. xml.

<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/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.demo.hello</groupId><artifactId>hello-world</artifactId><version>1.0.0-SNAPSHOT</version><name>hello</name></project>

Note:

ModelVersion: Specifies the current POM model version. Maven2 and Maven3 can only be 4.0.0

GroupId: Project Team name

ArtifactId: the unique id of the current Maven project in the group

Version: version

Hello. java under Hello \ src \ main \ java

package com.demo ;public class Hello {public void sayHi(){System.out.println("hello world");}public static void main(String [] args){new Hello().sayHi();}}

Run the cleanup and compilation commands:

Enter the hello folder path and run

mvn clean compile

Running result

View the content of the target folder

View local repository

Test:

Hello \ pom. xml

<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/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.demo.hello</groupId><artifactId>hello-world</artifactId><version>1.0.0-SNAPSHOT</version><name>hello</name><properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies><dependency>  <groupId>junit</groupId>  <artifactId>junit</artifactId>  <version>4.10</version>  <scope>test</scope></dependency>  </dependencies></project>

Dependencies: indicates the dependent packages required by this project.

Hello \ src \ test \ java \ HelloTest. java

package com.demo;import org.junit.Test;public class HelloTest {@Testpublic void testHello(){new Hello().sayHi();}}

Run the test command

mvn clean test

View results

View local repository

Package

Run commands

mvn clean package

View results

Run

Rebuild pom. xml and add the plug-in

Pom. xml

<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/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.demo.hello</groupId><artifactId>hello-world</artifactId><version>1.0.0-SNAPSHOT</version><name>hello</name><properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies><dependency>  <groupId>junit</groupId>  <artifactId>junit</artifactId>  <version>4.10</version>  <scope>test</scope></dependency>  </dependencies>  <build>    <plugins>    <plugin>      <groupId>org.apache.maven.plugins</groupId>      <artifactId>maven-compiler-plugin</artifactId>      <configuration>        <source>1.5</source>        <target>1.5</target>      </configuration>    </plugin>    <plugin>      <groupId>org.apache.maven.plugins</groupId>      <artifactId>maven-shade-plugin</artifactId>      <version>1.2.1</version>      <executions>        <execution>          <phase>package</phase>          <goals>            <goal>shade</goal>          </goals>          <configuration>            <transformers>              <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">                <mainClass>com.demo.Hello</mainClass>              </transformer>            </transformers>          </configuration>        </execution>      </executions>    </plugin>    </plugins>  </build></project>

Run the packaging command again:

mvn clean package

After the execution is complete, go to hello/target and run the command

java -jar hello-world-1.0.0-SNAPSHOT.jar

View results:

Install it to the local repository for other projects to depend on

Run commands

mvn clean install

View local repository

Source code download