Maven Sonatype Nexus return 401

源：http://www.trinea.cn/dev-tools/maven-sonatype-nexus-return-401-which-settings-xml-maven-is-using/
评：
/app/maven/bin/mvn help:effective-settings
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主要解决Sonatype Nexus return ’401′问题及查看maven当前生效的是哪个settings.xml

使用Sonatype把自己android-common的和android-auto-scroll-view-pager等库发布到Maven中央仓库
mvn clean deploy却发现始终401，提示
Java

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy (default-deploy)
on project trinea-android-common: Failed to deploy artifacts: Could not transfer artifact
cn.trinea.android.common:trinea-android-common:pom:4.2.10-20140510.125625-1 from/to
sonatype-nexus-snapshots (https://oss.sonatype.org/content/repositories/snapshots/):
Failed to transfer file: https://oss.sonatype.org/content/repositories/snapshots/
cn/trinea/android/common/trinea-android-common/4.2.10-SNAPSHOT/trinea-android-common-4.2.10-20140510.125625-1.pom.
Return code is: 401, ReasonPhrase: Unauthorized. -> [Help 1]
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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy (default-deploy)
on project trinea-android-common: Failed to deploy artifacts: Could not transfer artifact
cn.trinea.android.common:trinea-android-common:pom:4.2.10-20140510.125625-1 from/to
sonatype-nexus-snapshots (https://oss.sonatype.org/content/repositories/snapshots/):
Failed to transfer file: https://oss.sonatype.org/content/repositories/snapshots/
cn/trinea/android/common/trinea-android-common/4.2.10-SNAPSHOT/trinea-android-common-4.2.10-20140510.125625-1.pom.
Return code is: 401, ReasonPhrase: Unauthorized. -> [Help 1]
检查了下
(1) 已添加C:\Users\your-user-name\.m2\settings.xml，并且内容包含
Java

<settings>
  ...
  <servers>
    <server>
      <id>sonatype-nexus-snapshots</id>
      <username>your-jira-id</username>
      <password>your-jira-pwd</password>
    </server>
    <server>
      <id>sonatype-nexus-staging</id>
      <username>your-jira-id</username>
      <password>your-jira-pwd</password>
    </server>
  </servers>
  ...
</settings>
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<settings>
  ...
  <servers>
    <server>
      <id>sonatype-nexus-snapshots</id>
      <username>your-jira-id</username>
      <password>your-jira-pwd</password>
    </server>
    <server>
      <id>sonatype-nexus-staging</id>
      <username>your-jira-id</username>
      <password>your-jira-pwd</password>
    </server>
  </servers>
  ...
</settings>
(2) 上面的your-jira-id和your-jira-pwd已经替换为自己在https://oss.sonatype.org/上的用户名和密码。

用mvn help:effective-settings查看了下当前生效的settings文件内容，发现并没有上面(1)中添加的内容，怀疑settings文件是否生效了，用mvn -X命令查看如下
Java

Java version: 1.7.0_02, vendor: Oracle Corporation
Java home: D:\Program Files\Java\jdk1.7.0_02\jre
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 7", version: "6.1", arch: "x86", family: "windows"
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from D:\Program Files\apache-maven-3.2.1\conf\settings.xml
[DEBUG] Reading user settings from C:\Users\Administrator\.m2\settings.xml
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Java version: 1.7.0_02, vendor: Oracle Corporation
Java home: D:\Program Files\Java\jdk1.7.0_02\jre
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 7", version: "6.1", arch: "x86", family: "windows"
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from D:\Program Files\apache-maven-3.2.1\conf\settings.xml
[DEBUG] Reading user settings from C:\Users\Administrator\.m2\settings.xml
先读的是maven安装目下conf里面的settings.xml，那为什么没生效呢？
直接修改D:\Program Files\apache-maven-3.2.1\conf\settings.xml mvn clean deploy可正常发布
D:\Program Files\apache-maven-3.2.1\conf\settings.xml拷贝到C:\Users\Administrator\.m2\下居然不会提示和已有的settings.xml文件重名冲突，复制两个文件名发现之前新建的文件名为?settings.xml，次奥，网页上复制过来多了个非法字符，并且一般不可见。这样删除?settings.xml这个文件保留settings.xml文件加上配置即可。

PS：
maven-help-plugin是一个小巧的辅助工具，最简单的help:system可以打印所有可用的环境变量和Java系统属性。help:effective-pom和help:effective-settings最为有用。
help:effective-pom用于查看当前生效的POM内容，指合并了所有父POM（包括Super POM）后的XML，所以可用于检测POM中某个配置是否生效
effective-settings可用于查看当前生效的settings.xml文件内容，所以可用于判断某个settings配置是否生效