The first Maven program Hello

1. Directory structure
   Hello
   src
   ——main
   ————java
   ————resources
   ——test
   ————java
   ————resources
   pom.xml The
   main directory is used to store the main program.
   The test directory is used to store test programs.
   The java directory is used to store source code files.
   The resources directory is used to store configuration files and resource files.
2. Create Maven's core configuration file pom.xml

<?xml version="1.0" ?>
<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.mojie.maven</groupId>	
<artifactId>Hello</artifactId>	
<version>0.0.1-SNAPSHOT</version>	
<name>Hello</name>
<dependencies>	
<dependency>			<groupId>junit</groupId>		<artifactId>junit</artifactId>			<version>4.9</version>			<scope>test</scope>	
	</dependency>
	</dependencies>
	</project>

1. Write the main code
   Create a new file Hello.java in the src/main/java/com/mojie/maven directory

package com.mojie.maven;
public class Hello {
    
    	
public String sayHello(String name){
    
    
		return "Hello "+name+"!";
			}
		}

4. Write test code
   Create a new test file HelloTest.java in the /src/test/java/com/mojie/maven directory

package com.mojie.maven;	
import org.junit.Test;
import static junit.framework.Assert.*;
public class HelloTest {
    
    	
@Test	
public void testHello(){
    
    		
Hello hello = new Hello();		
String results =hello.sayHello("litingwei");		
assertEquals("Hello litingwei!",results);//断言	}
}

5. Run a few basic Maven commands
   . Open the cmd command line, enter the root directory of the Hello project (the directory where the pom.xml file is located), execute the mvn compile command, check the root directory change
   , continue to enter the mvn clean command in
   cmd , and then check the root directory change again , enter the mvn clean compile command in cmd, check
   Enter the mvn test-compile command in the root directory change cmd, view the target directory change
   cmd enter the mvn clean test command, view the target directory change
   cmd enter the mvn clean package command, view the target directory change
   cmd enter the mvn source:jar command, view Target directory changes
   Note: When running Maven commands, you must enter the directory where the pom.xml file is located!