可选依赖 ， 去掉传递依赖间接引入依赖
添加依赖，需要显示定义



<dependency>
  <groupId>xxx</groupId>
  <artifactId>yyy</artifactId>
  <version>1.0</version>
  <scope>compile</scope>
  <optional>true</optional>
</dependency>




依赖排除

排除指定依赖 ，不需要 写版本



<dependency>    
  <groupId>xxx</groupId>
  <artifactId>yyy</artifactId>
  <version>1.0</version> 
  <exclusions>  
     <exclusion>	 
       <groupId>aaa</groupId>		
       <artifactId>bbb</artifactId>  
     </exclusion>  
  </exclusions>  
</dependency>



排除全部



<dependency>    
  <groupId>xxx</groupId>
  <artifactId>yyy</artifactId>
  <version>1.0</version> 
  <exclusions>  
     <exclusion>	 
       <groupId>*</groupId>		
       <artifactId>*</artifactId>  
     </exclusion>  
  </exclusions>  
</dependency>



maven-war-plugin 排除和包含指定文件或目录



<plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.2</version>
        <configuration>
          <packagingExcludes>WEB-INF/lib/*.jar</packagingExcludes>
        </configuration>
</plugin>