其他电脑通过aliyun镜像配置的maven项目，下载到本地电脑时maven一直下载失败

先是考虑因为另一台电脑创建项目时依赖库已经配置了阿里云镜像，

于是我也在本项目中配置了同样的镜像

一、配置阿里云镜像

settings.xml
需要修改repository地址：<localRepository>/Users/gavin/.m2/repository</localRepository>

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0     http://maven.apache.org/xsd/settings-1.0.0.xsd">
    <localRepository>/Users/gavin/.m2/repository</localRepository>
    <pluginGroups>
    </pluginGroups>
    <proxies>
    </proxies>
    <servers>
    </servers>
    <mirrors>
        <mirror>
            <id>alimaven</id>
            <mirrorOf>central</mirrorOf>
            <name>aliyun maven</name>
            <url>http://maven.aliyun.com/nexus/content/repositories/central</url>
        </mirror>
        <mirror>
            <id>alimaven</id>
            <name>aliyun maven</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <mirrorOf>central</mirrorOf>
        </mirror>
        <mirror>
            <id>central</id>
            <name>Maven Repository Switchboard</name>
            <url>http://repo1.maven.org/maven2</url>
            <mirrorOf>central</mirrorOf>
        </mirror>
        <mirror>
            <id>repo2</id>
            <mirrorOf>central</mirrorOf>
            <name>Human Readable Name for this Mirror.</name>
            <url>http://repo2.maven.org/maven2</url>
        </mirror>
        <mirror>
            <id>ibiblio</id>
            <mirrorOf>central</mirrorOf>
            <name>Human Readable Name for this Mirror.</name>
            <url>http://mirrors.ibiblio.org/pub/mirrors/maven2</url>
        </mirror>
        <mirror>
            <id>jboss-public-repository-group</id>
            <mirrorOf>central</mirrorOf>
            <name>JBoss Public Repository Group</name>
            <url>http://repository.jboss.org/nexus/content/groups/public</url>
        </mirror>
        <mirror>
            <id>google-maven-central</id>
            <name>Google Maven Central</name>
            <url>https://maven-central.storage.googleapis.com
            </url>
            <mirrorOf>central</mirrorOf>
        </mirror>
        <!-- 中央仓库在中国的镜像 -->
        <mirror>
            <id>maven.net.cn</id>
            <name>one of the central mirrors in china</name>
            <url>http://maven.net.cn/content/groups/public</url>
            <mirrorOf>central</mirrorOf>
        </mirror>
    </mirrors>
    <profiles>
        <profile>
            <id>jdk-1.8</id>
            <activation>
                <activeByDefault>true</activeByDefault>
                <jdk>1.8</jdk>
            </activation>
            <properties>
                <maven.compiler.source>1.8</maven.compiler.source>
                <maven.compiler.target>1.8</maven.compiler.target>
                <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
            </properties>
        </profile>
        <profile>
            <id>repository_set</id>
            <repositories>
                <repository>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                    <id>public</id>
                    <name>Public Repository</name>
                    <url>http://maven.aliyun.com/nexus/content/groups/public</url>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <releases>
                        <updatePolicy>never</updatePolicy>
                    </releases>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                    <id>public</id>
                    <name>Public Repository</name>
                    <url>http://maven.aliyun.com/nexus/content/groups/public</url>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>
</settings>

结果配置后并没有解决问题，依旧下载失败

二、强制更新maven

于是在maven里执行了

mvn clean install -e -U

再下载，OK了

这是maven的强制更新命令：
mvn clean install -e -U
-e表示详细异常，-U表示强制更新