why maven tries to download from repo1,maven.org before my local nexus?

I have installed nexus, and configured my settings.xml to use my local nexus as repository, however, it always tries to fetch artifact from repo1.maven.org fist and then 开发者_JAVA百科timeout before it goes to fetch from nexus.

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You need to declare in settings.xml that Nexus is a mirror for the external repos, as documented in the Nexus book (which you should read).

<mirrors>
  <mirror>
    <!--This sends everything else to /public -->
    <id>nexus</id>
    <mirrorOf>*</mirrorOf>
    <url>http://nexushost:8081/nexus/content/groups/public</url>
  </mirror>
</mirrors>

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We normally declare the repositories in the POM.xml:

<repositories>
    <repository>
        <id>internal</id>
        <url>http://192.168.0.10:8084/nexus/content/repositories/public</url>
    </repository>
    <repository>
    ...

According to the docs, the info in your settings.xml is the "local" repository, meaning the M2_REPO copy in your hard drive. http://maven.apache.org/settings.html

Also, we set up Nexus as a mirror of external repos, thus you only declare these at the Nexus server.

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In 2.2.1 and 3.0.3 the mirror is ignored in certain cases if you're using the -gs option to override the default and specify a customized global settings file. Make sure, there's a valid settings.xml around in conf.