maven deploy到nexus报错：Return code is: 401, ReasonPhrase:Unauthorized

提交到nexus时候报错：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy (default-deploy) on project *: Failed to deploy artifacts: Could not transfer artifact *:jar:1.0 from/to releases (http://10.1.81.199:8081/nexus/content/repositories/releases/): Failed to transfer file: http://10.1.81.199:8081/nexus/content/repositories/releases/com/cs2c/security-management-client* /1.0/*-1.0.jar. Return code is: 401, ReasonPhrase:Unauthorized.
原来是没有配置认证。
maven目录conf的setting.xml里，
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<server>
<id>releases</id>
<username>admin</username>
<password>admin123</password>
</server>
<server>
<id>snapshots</id>
<username>admin</username>
<password>admin123</password>
</server>
</servers>
用户名和密码都是nexus的。再次deploy即可。
注意这里的id要和pom.xml里远程deploy的地址对应一致，我的pom.xml里配置：
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<!-- 配置远程发布到私服，mvn deploy -->
<distributionManagement>
<repository>
<id>releases</id>
<name>Nexus Release Repository</name>
<url>http://10.1.81.199:8081/nexus/content/repositories/releases/</url>
</repository>
<snapshotRepository>
<id>snapshots</id>
<name>Nexus Snapshot Repository</name>
<url>http://10.1.81.199:8081/nexus/content/repositories/snapshots/</url>
</snapshotRepository>
</distributionManagement>

如果这里不配置，会报错：
报错：Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.5:deploy (default-deploy) on project git-demo: Deployment failed: repository element was not specified in the POM inside distributionManagement element or in -DaltDeploymentRepository=id::layout::url parameter