mvn命令格式：

You must specify a valid lifecycle phase

or a goal in the format <plugin-prefix>:<goal> or <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>.

第一种格式：lifecycle phase 

Available lifecycle phases are:

default生命周期    validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy,

clean生命周期    pre-clean, clean, post-clean,

site生命周期    pre-site, site, post-site, site-deploy.

查看help插件的帮助信息
mvn help:help

查看dependency的详细帮助信息

mvn dependency:help -Ddetail=true

其他说明：

-Ddetail=true 显示详细的执行信息

To see the full stack trace of the errors, re-run Maven with the -e switch.

Re-run Maven using the -X switch to enable full debug logging.

-P 显示的激活一个profile

-D 显示的指定系统属性