IDEA - Configure Maven & Create

1. IDEA configuration comes with the Maven plug-in

Idea also comes with a Maven plug-in, and we can also configure the built-in Maven plug-in, so we can use the built-in Maven or the Maven core program we installed

1.1 Configure the built-in Maven plugin

1. The Maven that comes with Idea is in the plugins directory of Idea's installation directory
   

2. After configuring the local warehouse in the built-in Maven, after opening Idea, you will find that the local warehouse automatically becomes the warehouse we set
   

3. Set up Maven to automatically guide the package
   

1.2 Configure our own Maven installation

1. Click Settings in the toolbar
   

2. Click OK to save

2. Create a Maven project in Idea

2.1 Create a Java project

1. Click File→New→Module…(If there is no Project before, select Project)→Maven
   

2. Click Next, configure the module to be inherited (if the item does not exist in the Project created directly), coordinates (GAV), and path. Different Idea versions may be different, I am using version 2019.3.3
   

3. Click Finish to create successfully

4. Configure Maven's core configuration file pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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.dqqqwd.maven</groupId>
 <artifactId>Hello</artifactId>
 <version>1.0-SNAPSHOT</version>
 <dependencies>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>4.12</version>
 <scope>test</scope>
 </dependency>
 </dependencies>
</project>

5. Write the main code
   Create a package in the src/main/java directory and create a Hello.java file

package com.dqqqwd.maven;

public class Hello {
    
    
	public String sayHello(String name){
    
    
 		return "Hello "+name+"!";
	} 
}

6. Write test code
   Create a package in the /src/test/java directory and create a HelloTest.java file

package com.dqqqwd.maven;

import org.junit.Test;
public class HelloTest {
    
    
	@Test
	public void testHello(){
    
    
		Hello hello = new Hello();
		String maven = hello.sayHello("Maven");
		System.out.println(maven);
	} 
}

7. Use Maven to run Maven projects
   

2.2 Create a Web project (understand)

1. Create a simple Maven project, the packaging method is war package

<groupId>com.dqqqwd.maven</groupId> 
<artifactId>MavenWeb</artifactId> 
<packaging>war</packaging> 
<version>1.0-SNAPSHOT</version>

2. Click Project Structure
   

3. Select the corresponding Module, set the Web directory
   

4. A prompt box will pop up, click OK after selecting the version
   

5. Generate web.xml file
   

6. Set the directory for storing web page files and click OK
   

7. Click OK

8. Found that there is an additional web directory in the project, and there is a blue dot on the directory
   

9. Create an index.jsp page in the web directory
   

10. Deploy to Tomcat and run

3. Import the Maven project in Idea

1. Click Project Structure
   

2. Click Modules→➕→Import Module
   

3. Find the location of the project
   

4. Select Import module from external model→Maven→Finish