Why learn this technique?
2. How to make a thing automatically import and configure this jar package for us;
From this, Maven was born
Maven project architecture management tool
We currently use this tool to facilitate the import of jar packages.
Core idea: convention is greater than configuration
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Be constrained, don't violate
Maven will stipulate how to write our Java code, must follow this specification.
Maven installation
1. Download address: https://maven.apache.org/download.cgi#
Linux system selection.tar.gz;
Windows selection.zip;
2. After downloading, unzip and get the following file directory:
3. Create a file directory
sudo mkdir / opt / maven sudo etc. apache-maven- 3.6 . 3 / opt / stomach
4. Create a maven local repository
sudo mkdir maven-repo
5. Configure the path of the local warehouse
Go to the "/opt/maven/apache-maven-3.6.3/conf" path and enter at the command line:
sudo gedit settings.xml
ctrl + F Enter "localRepository", quickly locate the path of the local warehouse to set the label, modify the label content to your custom local warehouse path, and then copy it out of the comment label.
<localRepository>/opt/maven/apache-maven-3.6.3/maven-repo</localRepository>
6. Configure maven environment variables
Command line input:
sudo gedit /etc/profile
Then add:
MAVEN_HOME=/opt/maven/apache-maven-3.6.3 export MAVEN_HOME export PATH=${PATH}:{MAVEN_HOME}/bin
If the command line uses zsh, then you need to set the environment variables in the following way:
sudo gedit ~/.zshrc
Then add:
export MAVEN_HOME=/opt/maven/apache-maven-3.6.3 export M2=$MAVEN_HOME/bin export PATH=$M2:$PATH
Then save, close the terminal, reopen the terminal, enter the "mvn -v" command:
7. Configure maven in IDEA
Open IDEA and click File-> Settings-> Maven in the upper left corner
Configuration:
Maven home directory : Maven installation path for yourself
User settings file : the path to your settings.xml (need to check Override, otherwise it cannot be changed)
Local repository : will be automatically filled according to settings.xml
Note: I have encountered a problem here, that is to create the maven local repository in a separate place, and then when I created the maven project, it has been unable to successfully create, resulting in this exception:
Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to alimaven
After querying the information, I changed my local warehouse to the "apache-maven-3.6.3" folder, and then the maven project was built successfully, so be sure to remember this place and put the maven local warehouse in the root of maven Under the directory .
8. Configure Alibaba Cloud Mirror:
Go to the "/opt/maven/apache-maven-3.6.3/conf" folder, then edit the "settings.xml" file and add the following content to the <mirrors> tag:
< mirror > < id > nexus-aliyun </ id > < mirrorOf > * ,! jeecg,! jeecg-snapshots </ mirrorOf > < name > Nexus aliyun </ name > < url > http: // mavwill maven local The warehouse is placed in the root directory of maven en.aliyun.com/nexus/content/groups/public </ url > </ mirror >
9. The process of creating a maven project
Just follow the steps step by step, which may require you to choose your own maven version and other information.
Succeeded.
