Maven安装和测试
Downloading:?http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.4.1/maven-clean-plugin-2.4.1.pom
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[INFO]?org.apache.maven.plugins:maven-help-plugin:2.1.1
Name:?Maven?Help?Plugin
Description:?The?Maven?Help?plugin?provides?goals?aimed?at?helping?to?make
??sense?out?of?the?build?environment.?It?includes?the?ability?to?view?the
??effective?POM?and?settings?files,?after?inheritance?and?active?profiles?have
??been?applied,?as?well?as?a?describe?a?particular?plugin?goal?to?give?usage
??information.
Group?Id:?org.apache.maven.plugins
Artifact?Id:?maven-help-plugin
Version:?2.1.1
Goal?Prefix:?help
This?plugin?has?9?goals:
help:active-profiles
??Description:?Displays?a?list?of?the?profiles?which?are?currently?active?for
????this?build.
help:all-profiles
??Description:?Displays?a?list?of?available?profiles?under?the?current
????project.
????Note:?it?will?list?all?profiles?for?a?project.?If?a?profile?comes?up?with?a
????status?inactive?then?there?might?be?a?need?to?set?profile?activation
????switches/property.
help:describe
??Description:?Displays?a?list?of?the?attributes?for?a?Maven?Plugin?and/or
????goals?(aka?Mojo?-?Maven?plain?Old?Java?Object).
help:effective-pom
??Description:?Displays?the?effective?POM?as?an?XML?for?this?build,?with?the
????active?profiles?factored?in.
help:effective-settings
??Description:?Displays?the?calculated?settings?as?XML?for?this?project,
????given?any?profile?enhancement?and?the?inheritance?of?the?global?settings
????into?the?user-level?settings.
help:evaluate
??Description:?Evaluates?Maven?expressions?given?by?the?user?in?an
????interactive?mode.
help:expressions
??Description:?Displays?the?supported?Plugin?expressions?used?by?Maven.
help:help
??Description:?Display?help?information?on?maven-help-plugin.
????Call
??????mvn?help:help?-Ddetail=true?-Dgoal=<goal-name>
????to?display?parameter?details.
help:system
??Description:?Displays?a?list?of?the?platform?details?like?system?properties
????and?environment?variables.
For?more?information,?run?'mvn?help:describe?[]?-Ddetail'
[INFO]?------------------------------------------------------------------------
[INFO]?BUILD?SUCCESS
[INFO]?------------------------------------------------------------------------
[INFO]?Total?time:?2:29.749s
[INFO]?Finished?at:?Thu?Jan?13?17:01:15?CST?2011
[INFO]?Final?Memory:?3M/7M
[INFO]?------------------------------------------------------------------------
上面的输出为help插件的Maven坐标，我们也可以看到新版本的Maven的9个目标，每个目标都做了说明，同时还包括了该插件的一个简要介绍、前缀等，如果你想要 Help 插件输出完整的带有参数的目标列表，只要运行带有参数full的help:describe目标就可以了
mvn?help:describe?-Dplugin=help?-Dfull
此时会输出非常详细的插件信息
[INFO]?Scanning?for?projects
[INFO]
[INFO]?------------------------------------------------------------------------
[INFO]?Building?Maven?Stub?Project?(No?POM)?1
[INFO]?------------------------------------------------------------------------
[INFO]
[INFO]?---?maven-help-plugin:2.1.1:describe?(default-cli)?@?standalone-pom?---
[INFO]?org.apache.maven.plugins:maven-help-plugin:2.1.1
Name:?Maven?Help?Plugin
Description:?The?Maven?Help?plugin?provides?goals?aimed?at?helping?to?make
??sense?out?of?the?build?environment.?It?includes?the?ability?to?view?the
??effective?POM?and?settings?files,?after?inheritance?and?active?profiles?have
??been?applied,?as?well?as?a?describe?a?particular?plugin?goal?to?give?usage
??information.
Group?Id:?org.apache.maven.plugins
Artifact?Id:?maven-help-plugin
Version:?2.1.1
Goal?Prefix:?help
This?plugin?has?9?goals:
help:active-profiles
??Description:?Displays?a?list?of?the?profiles?which?are?currently?active?for
????this?build.
??Implementation:?org.apache.maven.plugins.help.ActiveProfilesMojo
??Language:?java
??Available?parameters:
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
help:all-profiles
??Description:?Displays?a?list?of?available?profiles?under?the?current
????project.
????Note:?it?will?list?all?profiles?for?a?project.?If?a?profile?comes?up?with?a
????status?inactive?then?there?might?be?a?need?to?set?profile?activation
????switches/property.
??Implementation:?org.apache.maven.plugins.help.AllProfilesMojo
??Language:?java
??Available?parameters:
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
help:describe
??Description:?Displays?a?list?of?the?attributes?for?a?Maven?Plugin?and/or
????goals?(aka?Mojo?-?Maven?plain?Old?Java?Object).
??Implementation:?org.apache.maven.plugins.help.DescribeMojo
??Language:?java
??Available?parameters:
????artifactId
??????Expression:?${artifactId}
??????The?Maven?Plugin?artifactId?to?describe.
??????Note:?Should?be?used?with?groupId?parameter.
????cmd
??????Expression:?${cmd}
??????A?Maven?command?like?a?single?goal?or?a?single?phase?following?the?Maven
??????command?line:
??????mvn?[options]?[<goal(s)>]?[<phase(s)>]
????detail?(Default:?false)
??????Expression:?${detail}
??????This?flag?specifies?that?a?detailed?(verbose)?list?of?goal?(Mojo)
??????information?should?be?given.
????goal
??????Expression:?${goal}
??????The?goal?name?of?a?Mojo?to?describe?within?the?specified?Maven?Plugin.?If
??????this?parameter?is?specified,?only?the?corresponding?goal?(Mojo)?will?be
??????described,?rather?than?the?whole?Plugin.
????groupId
??????Expression:?${groupId}
??????The?Maven?Plugin?groupId?to?describe.
??????Note:?Should?be?used?with?artifactId?parameter.
????medium?(Default:?true)
??????Expression:?${medium}
??????This?flag?specifies?that?a?medium?list?of?goal?(Mojo)?information?should
??????be?given.
????minimal?(Default:?false)
??????Expression:?${minimal}
??????This?flag?specifies?that?a?minimal?list?of?goal?(Mojo)?information?should
??????be?given.
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
????plugin
??????Expression:?${plugin}
??????The?Maven?Plugin?to?describe.?This?must?be?specified?in?one?of?three
??????ways:
??????1.??plugin-prefix,?i.e.?'help'
??????2.??groupId:artifactId,?i.e.?'org.apache.maven.plugins:maven-help-plugin'
??????3.??groupId:artifactId:version,?i.e.
????????'org.apache.maven.plugins:maven-help-plugin:2.0'
????version
??????Expression:?${version}
??????The?Maven?Plugin?version?to?describe.
??????Note:?Should?be?used?with?groupId/artifactId?parameters.
help:effective-pom
??Description:?Displays?the?effective?POM?as?an?XML?for?this?build,?with?the
????active?profiles?factored?in.
??Implementation:?org.apache.maven.plugins.help.EffectivePomMojo
??Language:?java
??Available?parameters:
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
help:effective-settings
??Description:?Displays?the?calculated?settings?as?XML?for?this?project,
????given?any?profile?enhancement?and?the?inheritance?of?the?global?settings
????into?the?user-level?settings.
??Implementation:?org.apache.maven.plugins.help.EffectiveSettingsMojo
??Language:?java
??Available?parameters:
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
????showPasswords?(Default:?false)
??????Expression:?${showPasswords}
??????For?security?reasons,?all?passwords?are?hidden?by?default.?Set?this?to
??????true?to?show?all?passwords.
help:evaluate
??Description:?Evaluates?Maven?expressions?given?by?the?user?in?an
????interactive?mode.
??Implementation:?org.apache.maven.plugins.help.EvaluateMojo
??Language:?java
??Available?parameters:
????artifact
??????Expression:?${artifact}
??????An?artifact?for?evaluating?Maven?expressions.
??????Note:?Should?respect?the?Maven?format,?i.e.
??????groupId:artifactId[:version][:classifier].
????expression
??????Expression:?${expression}
??????An?expression?to?evaluate?instead?of?prompting.?Note?that?this?must?not
??????include?the?surrounding?${}.
help:expressions
??Description:?Displays?the?supported?Plugin?expressions?used?by?Maven.
??Implementation:?org.apache.maven.plugins.help.ExpressionsMojo
??Language:?java
??Available?parameters:
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
help:help
??Description:?Display?help?information?on?maven-help-plugin.
????Call
??????mvn?help:help?-Ddetail=true?-Dgoal=<goal-name>
????to?display?parameter?details.
??Implementation:?org.apache.maven.plugins.help.HelpMojo
??Language:?java
??Available?parameters:
????detail?(Default:?false)
??????Expression:?${detail}
??????If?true,?display?all?settable?properties?for?each?goal.
????goal
??????Expression:?${goal}
??????The?name?of?the?goal?for?which?to?show?help.?If?unspecified,?all?goals
??????will?be?displayed.
????indentSize?(Default:?2)
??????Expression:?${indentSize}
??????The?number?of?spaces?per?indentation?level,?should?be?positive.
????lineLength?(Default:?80)
??????Expression:?${lineLength}
??????The?maximum?length?of?a?display?line,?should?be?positive.
help:system
??Description:?Displays?a?list?of?the?platform?details?like?system?properties
????and?environment?variables.
??Implementation:?org.apache.maven.plugins.help.SystemMojo
??Language:?java
??Available?parameters:
????output
??????Expression:?${output}
??????Optional?parameter?to?write?the?output?of?this?help?in?a?given?file,
??????instead?of?writing?to?the?console.
??????Note:?Could?be?a?relative?path.
[INFO]?------------------------------------------------------------------------
[INFO]?BUILD?SUCCESS
[INFO]?------------------------------------------------------------------------
[INFO]?Total?time:?1.313s
[INFO]?Finished?at:?Thu?Jan?13?17:38:55?CST?2011
[INFO]?Final?Memory:?3M/7M
[INFO]?------------------------------------------------------------------------
该选项能让你查看插件所有的目标及相关参数。但是有时候这些信息显得太多了。这时候你可以获取单个目标的信息，设置mojo参数和plugin参数。下面的命令列出了Compiler插件的compile目标的所有信息
mvn?help:describe?-Dplugin=compiler?-Dmojo=compile?-Dfull
在Maven里面，一个插件目标也被认为是一个Mojo。比如上面我们看到help插件有system目标，所以我们可以这样来查看help:system下的output信息
mvn?help:system?-Dplugin=help?-Dmojo=output?-Dfull
源链接：http://www.blogjava.net/caojianhua/archive/2011/01/13/342945.html
