One, Maven installation and configuration
Two, configure the Maven environment in IEDA and create a Maven project
I won’t talk about maven or java development first, let’s talk about cooking
For example, you might like to make a braised pork ribs (HongshaoxiaopaiApp), the materials you need are:
- Spare ribs (paigu.jar), to be a little pig (version=little pig).
- Soy sauce (jiangyou.jar), soy sauce for 82 years (version=1982)
- 盐(yan.jar)
- Sugar (tang.jar), sugar must be made in Guangdong (version=guangdong)
- Ginger (shengjiang.jar)
- Fennel (huixiang.jar)
So, you have to go to the vegetable farm to buy spare ribs, go to the grocery store at the door to buy soy sauce, buy salt... Maybe the grocery store at your door does not have the soy sauce of 1982, you have to go to the farmer’s market 3 kilometers away to buy... you buy raw materials The process is estimated to be painful, and the materials that may be purchased are not 1982, which will affect the taste.
Before you formally start making ribs, you will be half busy with the ingredients.
Now there is a boxed version of semi-finished braised pork ribs in a supermarket. The raw spare ribs, 1982 soy sauce, salt, sugar from Guangdong and other ingredients are packed into a box. You just need to follow the instructions to get the braised pork ribs. The ribs are made without considering the source of the material.
Maven is the supermarket. Braised pork ribs is the software you want to develop. Soy sauce and salt are the jar packages you need to develop software. We know that it is normal to develop a java system and download a bunch of jar package dependencies. With maven, you don't need to download various versions of jar packages from various websites, and you don't need to consider the dependencies of these jar packages.
Maven will do it for you, that is, the side dish master at the supermarket will help you match the ingredients for the braised pork ribs.
Now everyone should understand what Maven does.
Maven is a project management tool that can build and depend on Java projects.
1. JDK (Maven requires jdk1.7 or above)
1.1 Install jdk (download from official website)
Download link: https://www.oracle.com/java/technologies/javase-downloads.html
1.2 Configure the environment variable JAVA-HOME
The variable value is the path of the installed jdk
例：C:\Program Files\Environment\Java\jdk-15.0.1
1.3 Configure environment variable path
The variable value is the path of the bin under the installed jdk
例：C:\Program Files\Environment\Java\jdk-15.0.1\bin
1.4 Check version
Open the DOS interface, check the version "win+R" and enter "cmd", enter "java -version" in the interface
2. Download Maven and configure its environment variables
2.1 Download address: https://maven.apache.org/
2.2 Configure Maven environment variables
After decompression, configure the root directory of Maven to the system environment variable MAVEN-HOME, and configure the bin directory to the path variable.
2.3 Check if Maven is installed successfully
Open the DOS interface, "win+R" and then enter "cmd", enter "mvn -version" in the interface
3. Configure Maven's setting file
Open the maven directory -> conf ->setting.xml
3.1 Local warehouse location modification
<localRepository> The address of the local repository you created
<localRepository>
3.2 Replace Ali's mirror to speed up dependency download
Also open the setting.xml file, find the <mirrors> tag node, and add Alibaba Cloud private server to this tag
< mirror >
< id >alimaven</ id >
< mirrorOf >central</ mirrorOf >
< name >aliyun maven</ name >
http://maven.aliyun.com/nexus/content/repositories/central/
</ mirror >
或者
< mirror>
< id>nexus-aliyun< /id>
< mirrorOf>central< /mirrorOf>
< name>Nexus aliyun</ name>
< url>http://maven.aliyun.com/nexus/content/groups/public< /url>
< /mirror>
4. IDEA editor integrated with Maven environment
Open IDEA and select "File" -> "Other Settings" -> "Settings for New Projects..." to 
configure related content
To
5. Create a Maven project
1. Select "File" "New" "Project"
2. Select "Maven", set the JDK version, and select the template of the maven project
3. Set the project name and work location
4. Check the Maven environment
5. Wait for the project to be created and download the resources
6. After creation, the directory structure is as follows
