What are the types of maven warehouses?

Maven warehouse types: 1. Local warehouse; 2. Remote warehouse; 3. Central warehouse; 4. Private server warehouse; 5. Other public remote warehouses. Detailed introduction: 1. The local warehouse is a warehouse stored on the local disk, which is the default warehouse type; 2. The remote warehouse is a warehouse stored on the network, which can be a central warehouse, a private server warehouse, and other public remote warehouses. Composition; 3. The central warehouse is a remote warehouse maintained by the Maven team, which contains components of most popular open source projects in the world; 4. Private server warehouses, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The Maven warehouse is a centralized repository for storing artifacts built by Maven. Artifacts are the products of the build process, including compiled code, documentation, test reports, etc. Maven warehouses can be divided into the following types:

1. Local warehouse: The local warehouse is a warehouse stored on the local disk, and it is the default warehouse type. When Maven performs a build, it looks for required dependencies and plugins in the local repository. If a required dependency or plugin does not exist in the local repository, Maven downloads it from the remote repository and stores it in the local repository. The location of the local warehouse can be configured in the Maven configuration file (settings.xml).

2. Remote warehouse: Remote warehouse is a warehouse stored on the network, which can be composed of a central warehouse, a private server warehouse and other public remote warehouses. When Maven cannot find a required dependency or plugin in the local repository, it downloads it from the remote repository. The location of the remote warehouse needs to be configured in the Maven configuration file.

3. Central warehouse: The central warehouse is a remote warehouse maintained by the Maven team. It contains components of most popular open source projects in the world. The central repository contains a large number of commonly used dependencies and plugins, so it is one of the most commonly used remote repositories.

4. Private server warehouse: The private server warehouse is a special remote warehouse that is usually maintained internally by the company. The private server warehouse can be used as a shared repository for the company's internal components, or as an image cache for public class libraries, reducing the frequency of external access and downloads. Private server warehouses can reduce access to the central warehouse, improve construction efficiency, and ensure component consistency for internal projects within the company.

5. Other public remote warehouses: In addition to the central warehouse and private server warehouse, there are also some other public remote warehouses, such as JFrog, Nexus, etc. These repositories provide a richer selection of components, including some non-open source commercial components.

The functions of each warehouse are as follows:

1. Local warehouse: is used to store jar packages downloaded from remote warehouses and central warehouses. For use in local projects. The jar package used by the project is first obtained from the local warehouse.

2. Remote warehouse: When the local warehouse does not have the required jar package, Maven will go to the remote warehouse to download it. Remote warehouses are usually maintained by companies, also known as private servers, which provide resources for local warehouses.

3. Central warehouse: This is a warehouse maintained by the Maven team. It stores a large number of jar packages and serves the entire Internet. The jar packages in the central warehouse are all open and cannot store copyrighted resources.

4. Private server: This is a warehouse used within the company. Its function is to save copyrighted resources, including purchased or self-developed jar packages. Private servers are only open to internal users, not to the outside world. The private server can be used as a shared repository for the company's internal components, or as a mirror cache for public class libraries, reducing the frequency of external access and downloads, improving construction efficiency, and ensuring the component consistency of the company's internal projects.

In short, the Maven warehouse is a centralized repository used to store and manage build artifacts. It can be divided into several types: local warehouse, remote warehouse, central warehouse, private server warehouse and other public remote warehouses. When configuring the Maven environment, you need to select the appropriate warehouse type and configure it accordingly to ensure that Maven can correctly download and manage dependencies and plug-ins.

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