当构建Maven项目时，首先检查pom.xml文件以确定依赖包的下载位置，执行顺序如下：

1、从本地资源库中查找并获得依赖包，如果没有，执行第2步。

2、从Maven默认中央仓库中查找并获得依赖包（http://repo1.maven.org/maven2/），如果没有，执行第3步。

3、如果在pom.xml中自定义的远程仓库，那么也会在这里的仓库中进行查找并获得依赖包，如果都没有找到，那么Maven就会抛出异常。

    <!-- 如有Nexus私服, 取消注释并指向正确的服务器地址.  
    <repository>  
        <id>nexus-repos</id>  
        <name>Team Nexus Repository</name>  
        <url>http://192.168.11.36:8888/nexus/content/groups/public</url>  
    </repository> -->

    <repository>  
        <id>oschina-repos</id>  
        <name>Oschina Releases</name>  
        <url>http://maven.oschina.net/content/groups/public</url>  
    </repository>

    <repository>  
        <id>aliyun-repos</id>  
        <name>aliyun Releases</name>  
        <url>http://maven.aliyun.com/nexus/content/groups/public/</url>  
    </repository>

    <repository>  
        <id>java-repos</id>  
        <name>Java Repository</name>  
        <url>https://maven.java.net/content/repositories/public/</url>  
    </repository>

    <repository>  
        <id>JBoss-repos</id>  
        <name>JBoss Repository</name>  
        <url>http://repository.jboss.org/nexus/content/groups/public/</url>  
    </repository>

    <repository>  
        <id>springsource-repos</id>  
        <name>SpringSource Repository</name>  
        <url>http://repo.spring.io/release/</url>  
    </repository>

    <repository>  
        <id>central-repos</id>  
        <name>Central Repository</name>  
        <url>http://repo.maven.apache.org/maven2</url>  
    </repository>

    <repository>  
        <id>central-repos2</id>  
        <name>Central Repository 2</name>  
        <url>http://repo1.maven.org/maven2/</url>  
    </repository>

    <repository>  
        <id>activiti-repos</id>  
        <name>Activiti Repository</name>  
        <url>https://maven.alfresco.com/nexus/content/groups/public</url>  
    </repository>

    <repository>  
        <id>activiti-repos2</id>  
        <name>Activiti Repository 2</name>  
        <url>https://app.camunda.com/nexus/content/groups/public</url>  
    </repository>

    <repository>  
        <id>easonjim-repos</id>  
        <name>EasonJim Repository</name>  
        <url>https://raw.github.com/easonjim/repository/master</url>  
    </repository>

</repositories>