mvn 依赖管理

相关命令

mvn dependency:help
mvn dependency:analyze
mvn dependency:tree
mvn dependency:list
mvn dependency:tree -DoutputType=graphml -DoutputFile=dependency.graphml
mvn dependency:resolve-plugins
mvn dependency:copy-dependencies -DoutputDirectory=lib
mvn dependency:copy-dependencies -DoutputDirectory=lib -DincludeScope=compile

mvn dependency:analyze -DignoreNonCompile

[WARNING] Used undeclared dependencies found:
[WARNING]    org.springframework:spring-web:jar:5.0.5.RELEASE:compile
[WARNING]    org.springframework.boot:spring-boot-test:jar:2.0.1.RELEASE:test
[WARNING]    javax.validation:validation-api:jar:2.0.1.Final:compile
[WARNING]    org.springframework.boot:spring-boot:jar:2.0.1.RELEASE:compile
[WARNING]    org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.29:compile
[WARNING]    org.springframework:spring-test:jar:5.0.5.RELEASE:test
[WARNING]    org.springframework.boot:spring-boot-autoconfigure:jar:2.0.1.RELEASE:compile
[WARNING]    org.springframework:spring-webmvc:jar:5.0.5.RELEASE:compile
[WARNING]    junit:junit:jar:4.12:test
[WARNING]    org.springframework:spring-core:jar:5.0.5.RELEASE:compile
[WARNING]    org.springframework:spring-context:jar:5.0.5.RELEASE:compile
[WARNING] Unused declared dependencies found:
[WARNING]    org.springframework.boot:spring-boot-starter-web:jar:2.0.1.RELEASE:compile
[WARNING]    org.webjars:bootstrap:jar:3.3.7-1:compile
[WARNING]    org.webjars:jquery:jar:2.1.4:compile
[WARNING]    org.webjars:webjars-locator:jar:0.32-1:compile
[WARNING]    org.webjars:materializecss:jar:0.96.0:compile
[WARNING]    org.springframework.boot:spring-boot-starter-thymeleaf:jar:2.0.1.RELEASE:compile
[WARNING]    org.thymeleaf:thymeleaf-spring4:jar:3.0.9.RELEASE:compile
[WARNING]    org.mybatis.spring.boot:mybatis-spring-boot-starter:jar:1.3.2:compile

Unused declared dependencies found：指项目中未使用的，但是显示声明的依赖，但是对于这样的依赖，不能直接删除，要仔细分析。因为 dependency:analyze 只会分析编译主代码和测试代码用到的依赖，一些执行测试和运行时需要的依赖是发现不了的。但是很显然有些依赖是必须的，不能删除。所以要小心寻找无用的依赖信息，然后再删除。

将 Unused declared dependencies found 的包去掉之后，变为如下

[WARNING] Used undeclared dependencies found:
[WARNING]    org.springframework.boot:spring-boot-test:jar:2.0.1.RELEASE:test
[WARNING]    org.springframework.boot:spring-boot:jar:2.0.1.RELEASE:test
[WARNING]    org.springframework:spring-test:jar:5.0.5.RELEASE:test
[WARNING]    org.springframework.boot:spring-boot-autoconfigure:jar:2.0.1.RELEASE:test
[WARNING]    junit:junit:jar:4.12:test
[WARNING]    org.springframework:spring-core:jar:5.0.5.RELEASE:test
[WARNING]    org.springframework:spring-context:jar:5.0.5.RELEASE:test

mvn dependency:analyze

[WARNING] Used undeclared dependencies found:
[WARNING]    org.springframework.boot:spring-boot-test:jar:2.0.1.RELEASE:test
[WARNING]    org.springframework.boot:spring-boot:jar:2.0.1.RELEASE:test
[WARNING]    org.springframework:spring-test:jar:5.0.5.RELEASE:test
[WARNING]    org.springframework.boot:spring-boot-autoconfigure:jar:2.0.1.RELEASE:test
[WARNING]    junit:junit:jar:4.12:test
[WARNING]    org.springframework:spring-core:jar:5.0.5.RELEASE:test
[WARNING]    org.springframework:spring-context:jar:5.0.5.RELEASE:test
[WARNING] Unused declared dependencies found:
[WARNING]    mysql:mysql-connector-java:jar:5.1.46:runtime
[WARNING]    org.springframework.boot:spring-boot-starter-test:jar:2.0.1.RELEASE:test