1、坐标-找到项目依赖的重要依据

<groupId>cmbc.com.cn</groupId>
<artifactId>myapp</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>

说明:a、groupId、artifactId、version必须配置,packaging为可选配置,未配置则默认为jar

   b、项目构件名称与坐标相对应,通常为artifactId-version.packaging,上述坐标对应构件名称为

      myapp-1.0-SNAPSHOT

2、依赖配置

<project> 

  <dependencies>  可以包含多个<dependency>

    <dependency>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>...</version>
<type>...</type> 坐标类型,对应项目坐标定义的packaging
<scope>...</scope> 依赖范围
<optional>...</optional> 标记依赖是否可选
<exclusions>  排除传递性依赖
...
</exclusions>
</dependency> </dependencies> </project>

3、依赖详述

  • 依赖范围

a、依赖范围种类

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" alt="" width="437" height="223" />

b、依赖范围的作用

  Maven有编译、测试、运行classpath,依赖范围用于控制依赖与三种classpath的关系。

  • 传递性依赖

a、项目A依赖于B,B依赖于C,则C是A的传递性依赖。Maven会将必要的间接依赖以传递式依赖的形式引入到项目。

b、确定传递性依赖范围

  项目A依赖于B,B依赖于C,则B是A的第一直接依赖,C是B的第二直接依赖,C是A的传递性依赖。第一和第二直接依赖的范围决定了传递性依赖的范围,如下所示,左边为第一直接依赖范围,上面为第二直接依赖范围,中间为传递性依赖范围:

  • 依赖调解

  当项目多个直接依赖在其自己的依赖路径中分别依赖了同一个其它依赖,那么该引入哪一个路径上的依赖呢?

规则:不同路径长度,路径最短优先;相同路径长度,第一申明优先

  • 可选依赖

  假设A依赖于B,B依赖于C(可选),D(可选)(在B项目中的pom.xml文件依赖C和D,申明<dependency>中均添加<optional>true</optional>)。可选依赖不具备传递性,因此A项目中不能引入C或D的依赖,如果需要使用C或D需要在A项目中直接依赖C或D

  • 排除依赖

    传递性依赖会隐式的引入很多依赖,极大简化了项目依赖的管理。但在以下情形需要使用<exclusions>排除依赖:

a、A依赖B,B依赖C,C(快照版本)不稳定可能会影响项目A。此时需要排除C而引入C的稳定版本。

b、可能由于版权原因,C(稳定版本)不在中央仓库,而D项目是一个可替代的实现。此时需要排除C而引入D

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