依赖关系和存储库？ [英] Dependencies and Repositories?

问题描述

我是Maven的新手，我之前看到了另一个问题，但我仍然感到困惑。

I am new to Maven and I previously saw another question regarding the similar thing but I am still confused.

依赖关系和存储库与库之间有何区别？

我知道依赖项包含可以引用该项目的库。但是，它与外部依赖关系又有什么关系呢？

What is the difference between dependencies and repository in relation to libraries?
I am aware that dependencies contain libraries that the project can be referred to. But how would it relate to external dependencies?

推荐答案

使用maven时会产生一连串的问题。每个存储库都包含一个由组/工件/版本（GAV）唯一标识的库代码存储。

When you use maven there is a chain of repostitories. Each repository containers a store of library code, uniquely identified by group/artifact/version (GAV).

1）顶层是 Maven Central 在互联网上。

1) At the top level is maven central on the internet.

2）在下一级别，他们通常

2) At the next level their is usally a corporate repository, Nexus or JFrog or similar.

3）在本地计算机上，它们是一个存储库，通常在您的主目录.m2 / repo

3) On your local machine their is a repository, usually under your home directory .m2/repo

当在pom中包含依赖项时：

When you include a dependency in a pom like :

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-io</artifactId>
    <version>1.3.2</version>
</dependency>

然后进行Maven构建，它将首先从本地仓库中查找，然后进入您的公司，最后到了maven-central。每次运行时，它将依赖项下载到本地存储库中，以便下次使用。

and then do a maven build it will go up the tree looking first in your local repo, then in your corporate, then finally in maven-central. Each time it runs it will download the dependency to your local repo so it is ready next time.

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