Maven Learning (i)--installing MAVEN and configuring Maven in eclipse

Installing and configuring MAVEN environment variables

• Requires a Java environment already in the computer
• In the console, enter: echo %JAVA_HOME% See if you can display the path information of Java home;
• In the control bar input: java -version See if Java version information is displayed;
• Download official website: http://maven.apache.org/download.cgi
• Download the compiled version apache-maven-3.3.9-bin.zip and unzip it toC:\Park_Software\apache-maven-3.3.9
• To configure environment variables:
• New environment variable: M2_HOME = C:\Park_Software\apache-maven-3.3.9 Note that you cannot add a semicolon after the home variable;
• Add the PATH variable:;%M2_HOME%\bin;
• Check whether the configuration is successful in the console:
• CMD input:echo %M2_HOME%
• CMD input:mvn -v
• If the display is normal, the configuration succeeds.
• To modify the Maven warehouse path location:
• For example, if I want the warehouse location to be located on D, then create a new folder on the D drive:D:\m2\repository
• Configuration C:\Park_Software\apache-maven-3.3.9\conf files under the Config folder setting.xml :
• Locate the localrepository tag and modify it to: <localRepository>D:/m2/repository</localRepository> ;

• setting.xmlCopy the file to the D:\m2 folder.

  MAVEN Installation directory Analysis

  M2_home points to the MAVEN installation directory and enters the directory and finds the following files:

• Bin directory
• The directory contains mvn scripts that are running, which are used to configure Java commands;
• Boot directory
• Contains only one file: plexus-classworlds-2.5.2.jar is a classloader framework, equivalent to the default loader for Java classes.
• Conf Directory
• Contains settings.xml , an important configuration file that can globally customize the behavior of Maven.
• Lib Directory
• This directory contains all the Java class libraries required by the MAVEN runtime.
• LICENSE.txt
• NOTICE.txt
• Third-party software included with Maven is documented.

• README.txt

Set HTTP Proxy

(prior to installing the Maven plugin in eclipse failed many times, I do not know if the reason for not setting up the HTTP proxy before, so it is better to configure it)
First in the cmd input: ping repo1.maven.org , if you can not ping the same, you must first set up the agent, set up the way:
Enter the directory ~/.m2/ directory, locate the settings.xml file (if not, %M2_HOME%/conf/settings.xml copy it directly to the directory), and <proxies> add the following information to the tag:

<Proxies><Proxy><Id>my-proxy</Id><Active>true</Active><Protocol>http</protocol> < host>114.212.80.250</host> Span class= "Hljs-tag" ><port>80</ port> <username>park</username> < Password>****</password> << Span class= "Hljs-name" >nonproxyhosts>www.park.com|*.host.com</ nonproxyhosts></PROXY>   

Where the label is changed to its own IP address, host name and password.

Configuring Maven in Eclipse

• Open Eclipse, tap the Help tab, tap Install new software , and select Add options:
• NameEnter in field: m2e ;
• LocationEnter in field: http://download.eclipse.org/technology/m2e/releases ;
• Select the Maven plugin from search, then click Next.
• Installing the plug-in may take a while to restart Eclipse.

Create a MAVEN project in eclipse

In Eclipse, click File -> New -> Others -> Maven Project Create your own MAVEN project.
Enter your own name at Groupid,artifactid, as shown in:

• Group Id: Defines which group the project belongs to, which is often associated with the organization or company where the project is located. For example, Apache has created a project named Mymaven, then GroupID is: com.apache.myMaven;
• Artifact ID: Defines the unique ID of the current MAVEN project in the group. For example, the project Com.apache.myMaven has the following artifactid:mymaven-util, Mymaven-domain, Mymaven-web and so on;

Eclipse automatically generates MAVEN projects, directory structure:

Directory Analysis:

• src/main/java: This directory mainly places Java source code;
• src/test/java: This directory is mainly used to store test code;
• Maven Dependencies: This is where Maven managed jar files are mainly placed;
• target: Used to store maven compiled bytecode files;
• pom.xml: All called Project Object Model , the Project object model, which defines the basic information of the project, describes how the project is built, declares the project dependencies, and so on.
• src: Used to store resources such as other files that are used in main and test.

In the App.java in the src/main/java directory, there is already a HelloWorld.java simple applet that can be tested and run.

Packaged

You can pom.xml specify the type to package in, and the default is if unspecified .jar .
The packaging process is: Under the project root directory, execute the command mvn clean package , and then you can ./target/ find the package that you just packaged in the directory jar .

This completes the MAVEN installation, how to create a new MAVEN project in Eclipse, and how to package the project, followed by a practical project to further understand Maven.

Maven Learning (i)--installing MAVEN and configuring Maven in eclipse