Maven：dependency中scope与type的用法

女爷i 2022-03-02 07:12 759阅读 0赞

scope及其描述：

<table> 
 <tbody> 
  <tr> 
   <td>scope</td> 
   <td>描述</td> 
  </tr> 
  <tr> 
   <td>compile</td> 
   <td>This is the default scope, used if none is specified. Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects.</td> 
  </tr> 
  <tr> 
   <td>provided</td> 
   <td>This is much like compile, but indicates you expect the JDK or a container to provide the dependency at runtime. For example, when building a web application for the Java Enterprise Edition, you would set the dependency on the Servlet API and related Java EE APIs to scope provided because the web container provides those classes. This scope is only available on the compilation and test classpath, and is not transitive.</td> 
  </tr> 
  <tr> 
   <td>runtime</td> 
   <td>This scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath.</td> 
  </tr> 
  <tr> 
   <td>test</td> 
   <td>This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases. This scope is not transitive.</td> 
  </tr> 
  <tr> 
   <td> <p>system</p> <p>(deprecated)</p> </td> 
   <td>This scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository.</td> 
  </tr> 
  <tr> 
   <td>import</td> 
   <td>This scope is only supported on a dependency of type pom in the &lt;dependencyManagement&gt; section. It indicates the dependency to be replaced with the effective list of dependencies in the specified POM's &lt;dependencyManagement&gt; section. Since they are replaced, dependencies with a scope of import do not actually participate in limiting the transitivity of a dependency.</td> 
  </tr> 
 </tbody> 
</table>

总结一下：

<table style="width:680px;"> 
 <tbody> 
  <tr> 
   <td style="width:177px;">&nbsp;</td> 
   <td style="text-align:center;width:105px;">compile</td> 
   <td style="text-align:center;width:102px;">provided</td> 
   <td style="text-align:center;width:99px;">runtime</td> 
   <td style="text-align:center;width:98px;">test</td> 
   <td style="text-align:center;width:104px;">import</td> 
  </tr> 
  <tr> 
   <td style="width:177px;">compilation classpath</td> 
   <td style="text-align:center;width:105px;">√</td> 
   <td style="text-align:center;width:102px;">√</td> 
   <td style="text-align:center;width:99px;">x</td> 
   <td style="text-align:center;width:98px;">x</td> 
   <td style="text-align:center;width:104px;">未定</td> 
  </tr> 
  <tr> 
   <td style="width:177px;">test classpath</td> 
   <td style="text-align:center;width:105px;">√</td> 
   <td style="text-align:center;width:102px;">√</td> 
   <td style="text-align:center;width:99px;">√</td> 
   <td style="text-align:center;width:98px;">√</td> 
   <td style="text-align:center;width:104px;">未定</td> 
  </tr> 
  <tr> 
   <td style="width:177px;">runtime classpath</td> 
   <td style="text-align:center;width:105px;">√</td> 
   <td style="text-align:center;width:102px;">x</td> 
   <td style="text-align:center;width:99px;">√</td> 
   <td style="text-align:center;width:98px;">x</td> 
   <td style="text-align:center;width:104px;">未定</td> 
  </tr> 
 </tbody> 
</table>

type及其描述：

type的默认值为jar，也可以设置为war、bar、pom等。当type=pom时，必须scope=import。

参考文档

[Introduction to the Dependency Mechanism][]

[Introduction to the Dependency Mechanism]: http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html