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This article mainly explains "what are the basics of Maven". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Let the editor take you to learn "what are the basics of Maven"?

What is Maven

Maven is a project management and integrated tool. Maven provides developers to build a complete lifecycle framework. The development team can automate the basic tooling of the project, and Maven uses a standard directory structure and default build lifecycle. [automated build tools: compile-package-deploy-test-> automatic build of raw materials (java, js, css, html....)-> products (releasable projects)]

In multiple development team environments, Maven can be set to complete the configuration in a very short time according to the standard. Because most projects are simple to set up and reusable, Maven makes it easier for developers to create reports, review, build, and test automation settings.

In a nutshell, Maven simplifies and standardizes the project construction process. Handle seamless connections for compilation, allocation, documentation, teamwork, and other tasks. Maven increases reusability and is responsible for establishing related tasks.

II. The role of Maven

(1) manage jar packages

Add third-party jar packages (no need to download jar packages yourself)

Manage dependencies between jar packages (maven automatically associates downloads of all dependent jar packages)

(2) split the project into several modules

With Maven, you can split a project into multiple projects (like this).

(3) what Maven can do is as follows:

1. Clean up: delete the compiled results in preparation for recompilation.

two。 Compile: java- > class

3. Testing: test the key points in the project, or use the test code in the project to test the development code

4. Reports: displaying test results

5. Packaging: compress multiple files contained in the project into a single file for installation or deployment (java project into a jar package, web project into a war package, parent project-pom)

6. Installation: put the packaged package in the local warehouse for use by other projects.

7. Deployment: put the packed package on the server, ready to run.

To run a project in Eclipse in Tomcat, you need to deploy:

8. Deploy through the add and remove button in eclipse

9. Package the Web project into a war package, and then copy the war package to Tomcat/webapps.

Usually download a jar package, first download it in the local warehouse, and then connect to the central repository (image) to download it if it does not exist in the local warehouse.

III. Core concepts

The reason why Maven can automate the construction is closely related to its design. Our study of Maven revolves around its nine core concepts:

1.POM

two。 Agreed directory structure

3. Coordinate

4. Dependency management

5. Warehouse management

6. Life cycle

7. Plug-ins and goals

8. Inherit

9. Polymerization

IV. The concept and process of Maven construction

(1) Building is not creating, and creating a project is not equal to building a project, so we understand the build from the following three aspects.

1. Pure Java code

Java is a compiled language, and source files with .java extensions need to be compiled into bytecode files with .class extensions to execute. So writing any Java code that you want to execute must be compiled to the corresponding .class file.

2.Web project

When we need to access the Java program through the browser, we must "get" the compiled results of the Web project containing the Java program to the specified directory on the server and start the server. The process of "taking" is called deployment.

We can understand that the WEB project for compilation is rice, while the compiled WEB project is rice, and this compilation process is cooked rice.

3. Actual project

In the actual project to integrate the third-party framework, the Web project not only includes Java programs and JSP pages, pictures and other static resources, but also includes the jar package of the third-party framework and a variety of configuration files. All of these resources must be deployed to the server according to the correct directory structure before the project can run.

Therefore, building is the process of using static resources such as Java code, framework configuration files, internationalization and other resource files, JSP pages and images as "raw materials" to "produce" a project that can be run.

(2) Construction link

1. Clean up: delete the previous compilation results and prepare for recompilation.

two。 Compile: compile the Java source program into a bytecode file.

3. Testing: test the key points in the project to ensure the correctness of the key points in the iterative development process.

4. Report: record and display test results in a standard format after each test.

5. Packaging: encapsulate a project that contains many files into a compressed file for installation or deployment. Java project corresponds to jar package, and Web project corresponds to war package.

6. Installation: in the Maven environment, it specifically refers to installing the packaged result-- jar package or war package-- to the local repository.

7. Deployment: deploy the packaged results to a remote repository or deploy the war package to the server to run.

At this point, I believe you have a deeper understanding of "what are the basics of Maven?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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