获得干净的机器友好 Maven lines/xml/json 输出可由 STDOUT 中的脚本解析？

Question

例如，运行此命令用于 Maven 项目：

mvn dependency:list

我需要的Maven是只有这两行（从下面的输出中截取）：

com.example.code_samples.maven_dependencies:direct_library:jar:0.0.1-SNAPSHOT:compile
com.example.code_samples.maven_dependencies:indirect_library:jar:0.0.1-SNAPSHOT:compile

有没有办法 (CLI --option) 以简洁的方式仅查看此请求的信息，xml、json、...？

相反，输出看起来更像是非结构化日志。它没有已知的格式，并且在 STDOUT 中将所有类型的信息混合在一起。

[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO] 
[INFO] direct_library
[INFO] dependent_binary
[INFO] indirect_library
[INFO] maven_dependencies
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building direct_library 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://nexus:8081/nexus/content/repositories/snapshots/com/example/code_samples/maven_dependencies/indirect_library/0.0.1-SNAPSHOT/maven-metadata.xml
Downloaded: http://nexus:8081/nexus/content/repositories/snapshots/com/example/code_samples/maven_dependencies/indirect_library/0.0.1-SNAPSHOT/maven-metadata.xml (2 KB at 16.1
 KB/sec)
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ direct_library ---
[INFO] 
[INFO] The following files have been resolved:
[INFO]    junit:junit:jar:4.4:test
[INFO]    com.example.code_samples.maven_dependencies:indirect_library:jar:0.0.1-SNAPSHOT:compile
[INFO] 
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building dependent_binary 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://nexus:8081/nexus/content/repositories/snapshots/com/example/code_samples/maven_dependencies/direct_library/0.0.1-SNAPSHOT/maven-metadata.xml
Downloaded: http://nexus:8081/nexus/content/repositories/snapshots/com/example/code_samples/maven_dependencies/direct_library/0.0.1-SNAPSHOT/maven-metadata.xml (2 KB at 86.2 K
B/sec)
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ dependent_binary ---
[INFO] 
[INFO] The following files have been resolved:
[INFO]    com.example.code_samples.maven_dependencies:direct_library:jar:0.0.1-SNAPSHOT:compile
[INFO]    com.example.code_samples.maven_dependencies:indirect_library:jar:0.0.1-SNAPSHOT:compile
[INFO] 
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building indirect_library 3.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ indirect_library ---
[INFO] 
[INFO] The following files have been resolved:
[INFO]    none
[INFO] 
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building maven_dependencies 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ maven_dependencies ---
[INFO] 
[INFO] The following files have been resolved:
[INFO]    none
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] direct_library ..................................... SUCCESS [  0.813 s]
[INFO] dependent_binary ................................... SUCCESS [  0.026 s]
[INFO] indirect_library ................................... SUCCESS [  0.013 s]
[INFO] maven_dependencies ................................. SUCCESS [  0.002 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.065 s
[INFO] Finished at: 2015-03-24T12:10:01+08:00
[INFO] Final Memory: 18M/607M
[INFO] ------------------------------------------------------------------------

更新

或者，我会接受使用 Maven API 来获取运行时间数据的解决方案，例如 Collection<String>（而不是像上面那样无法可靠解析的文本输出）。

我查看了 Maven Invoker API，但我不抱希望 - 我的测试表明它只是一种从代码调用 Maven 的方法。这些 APIs return 没有运行时间数据（只是错误代码，所有有用的信息再次打印在日志中）。

Answer 1

Maven 使用标准的 slf4j 日志记录，包装在 plexus 容器中。 https://maven.apache.org/maven-logging.html

您应该能够配置 slf4j 绑定以提供不同的输出格式，详见此处 http://logback.qos.ch/manual/layouts.html#log4jXMLLayout

我不熟悉 cleanlines 和 json 日志记录格式；但是，slf4j 可能是适应性更强的日志记录包之一，所以四处寻找 Formatter，您就有机会找到它。但是，如果您不了解，上面的最后一个 link 也涵盖了有关如何编写您自己的日志记录布局的页面。

Answer 2

我能够提供属性以将所需的干净输出保存到文件中。

例如，-DoutputFile or -Doutput:

mvn dependency:list     -DoutputFile=dependencies.output.txt
mvn help:effective-pom  -Doutput=effective.pom.xml

如果需要 STDOUT，cat 文件。

尽管它不是通用的，但到目前为止，变通方法为我解决了所有情况。

获得干净的机器友好 Maven lines/xml/json 输出可由 STDOUT 中的脚本解析？

Get clean machine-friendly Maven lines/xml/json output parseable by scripts in STDOUT?

java

maven-plugin

maven