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我们在日常开发使用maven下载jar包速度会很慢，原因是maven默认的仓库地址是国外的，所以速度很慢，解决这个问题我们只需要修改maven仓库地址即可。
maven下载jar包时会优先去
C:\Users\用户\.m2\路径下查找setting.xml文件，
如果这里没有找到，会去我们在eclipse、idea中配置的maven目录中去查找
D:\apache-maven-3.6.1-bin\apache-maven-3.6.1\conf\setting.xml
修改为国内仓库地址，只需在setting.xml中添加以下配置即可。
<mirrors>
<mirror>
<id>alimaven</id>
<name>aliyun maven</name>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
<mirrorOf>central</mirrorOf>
</mirror>
<mirror>
<id>ui</id>
<mirrorOf>central</mirrorOf>
<name>Human Readable Name for this Mirror.</name>
<url>http://uk.maven.org/maven2/</url>
</mirror>
<mirror>
<id>osc</id>
<mirrorOf>central</mirrorOf>
<url>http://maven.oschina.net/content/groups/public/</url>
</mirror>
<mirror>
<id>osc_thirdparty</id>
<mirrorOf>thirdparty</mirrorOf>
<url>http://maven.oschina.net/content/repositories/thirdparty/</url>
</mirror>
</mirrors>完整配置
<?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">
<pluginGroups>
<!-- pluginGroup | Specifies a further group identifier to use for plugin
lookup. <pluginGroup>com.your.plugins</pluginGroup> -->
<pluginGroup>org.mortbay.jetty</pluginGroup>
</pluginGroups>
<!-- proxies | This is a list of proxies which can be used on this machine
to connect to the network. | Unless otherwise specified (by system property
or command-line switch), the first proxy | specification in this list marked
as active will be used. | -->
<proxies>
<!-- proxy | Specification for one proxy, to be used in connecting to the
network. | <proxy> <id>optional</id> <active>true</active> <protocol>http</protocol>
<username>proxyuser</username> <password>proxypass</password> <host>proxy.host.net</host>
<port>80</port> <nonProxyHosts>local.net|some.host.com</nonProxyHosts> </proxy> -->
</proxies>
<!-- servers | This is a list of authentication profiles, keyed by the server-id
used within the system. | Authentication profiles can be used whenever maven
must make a connection to a remote server. | -->
<servers>
<!-- server | Specifies the authentication information to use when connecting
to a particular server, identified by | a unique name within the system (referred
to by the 'id' attribute below). | | NOTE: You should either specify username/password
OR privateKey/passphrase, since these pairings are | used together. | <server>
<id>deploymentRepo</id> <username>repouser</username> <password>repopwd</password>
</server> -->
<!-- Another sample, using keys to authenticate. <server> <id>siteServer</id>
<privateKey>/path/to/private/key</privateKey> <passphrase>optional; leave
empty if not used.</passphrase> </server> -->
<server>
<id>releases</id>
<username>ali</username>
<password>ali</password>
</server>
<server>
<id>Snapshots</id>
<username>ali</username>
<password>ali</password>
</server>
</servers>
<!-- mirrors | This is a list of mirrors to be used in downloading artifacts
from remote repositories. | | It works like this: a POM may declare a repository
to use in resolving certain artifacts. | However, this repository may have
problems with heavy traffic at times, so people have mirrored | it to several
places. | | That repository definition will have a unique id, so we can create
a mirror reference for that | repository, to be used as an alternate download
site. The mirror site will be the preferred | server for that repository.
| -->
<mirrors>
<!-- mirror | Specifies a repository mirror site to use instead of a given
repository. The repository that | this mirror serves has an ID that matches
the mirrorOf element of this mirror. IDs are used | for inheritance and direct
lookup purposes, and must be unique across the set of mirrors. | <mirror>
<id>mirrorId</id> <mirrorOf>repositoryId</mirrorOf> <name>Human Readable
Name for this Mirror.</name> <url>http://my.repository.com/repo/path</url>
</mirror> -->
<mirror>
<!--This sends everything else to /public -->
<id>nexus</id>
<mirrorOf>*</mirrorOf>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</mirror>
<mirror>
<!--This is used to direct the public snapshots repo in the profile below
over to a different nexus group -->
<id>nexus-public-snapshots</id>
<mirrorOf>public-snapshots</mirrorOf>
<url>http://maven.aliyun.com/nexus/content/repositories/snapshots/</url>
</mirror>
</mirrors>
<profiles>
<profile>
<id>development</id>
<repositories>
<repository>
<id>central</id>
<url>http://central</url>
<releases>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>central</id>
<url>http://central</url>
<releases>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
<profile>
<!--this profile will allow snapshots to be searched when activated -->
<id>public-snapshots</id>
<repositories>
<repository>
<id>public-snapshots</id>
<url>http://public-snapshots</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>public-snapshots</id>
<url>http://public-snapshots</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
</profiles>
<activeProfiles>
<activeProfile>development</activeProfile>
<activeProfile>public-snapshots</activeProfile>
</activeProfiles>
</settings>