一、配置环境变量
配置maven环境变量在我的电脑-------属性-------高级系统设置---------环境变量---------系统变量--------新建
变量名：MAVEN_HOME变量值：D:\Application\Program\Maven\apache-maven-3.6.3（maven解压地址）
找到Path在环境变量值尾部加入：%MAVEN_HOME%\bin 检查maven的环境变量是否配置成功打开dos窗口运行命令mvn -v,出现如下图所示的信息说明安装成功；
二、修改本地仓库
Maven会将下载的类库（jar包）放置到本地的一个目录下（一般默认情况下maven在本机的仓库位于C:\我的文档中.m2.\repository），如果想重新定义这个目录的位置就需要修改Maven本地仓库的配置：
在自己喜欢的位置创建本地仓库，这是我的本地仓库地址（D:\Data\WorkSpace\Maven\Maven-Repository）在安装Maven的目录下找到conf文件夹，在文件夹中找到settings.xml文件，复制settings.xml文件放于D:\Data\WorkSpace\Maven，如下图所示：
修改settings.xml文件，在下方加入本地仓库的地址（D:\Data\WorkSpace\Maven\Maven-Repository），如下图所示：
<localRepository>D:\Data\WorkSpace\Maven\Maven-Repository</localRepository>
下图红色框选内容为新添加内容
在安装Maven的目录下找到conf文件夹，在文件夹中找到settings.xml文件，更改默认的仓库位置如下图所示：（注意两个地方的settings.xml都要修改）依据该配置，Maven就会将下载的类库保存到D:\Data\WorkSpace\Maven\Maven-Repository中。完成以上配置，测试配置是否有效，在控制台输入：mvn help:system
出现如下图所示内容，即为配置成功，并且Maven就会将下载的类库保存到D:\Data\WorkSpace\Maven\Maven-Repository中。
国内Maven镜像仓库
为加快下载速度，可在settings.xml中的<mirrors>中加入以下镜像：
<mirror><id>alimaven</id><name>aliyun maven</name><url>/nexus/content/groups/public/</url><mirrorOf>central</mirrorOf></mirror><mirror><id>alimaven</id><mirrorOf>central</mirrorOf><name>aliyun maven</name><url>/nexus/content/repositories/central/</url></mirror><mirror><id>ibiblio</id><mirrorOf>central</mirrorOf><name>Human Readable Name for this Mirror.</name><url>/pub/mirrors/maven2/</url></mirror><mirror><id>jboss-public-repository-group</id><mirrorOf>central</mirrorOf><name>JBoss Public Repository Group</name><url>/nexus/content/groups/public</url></mirror><mirror><id>central</id><name>Maven Repository Switchboard</name><url>/maven2/</url><mirrorOf>central</mirrorOf></mirror><mirror><id>repo2</id><mirrorOf>central</mirrorOf><name>Human Readable Name for this Mirror.</name><url>/maven2/</url></mirror>
加入镜像之后settings.xml的完整代码，如下所示：
<?xml version="1.0" encoding="UTF-8"?><!--Licensed to the Apache Software Foundation (ASF) under oneor more contributor license agreements. See the NOTICE filedistributed with this work for additional informationregarding copyright ownership. The ASF licenses this fileto you under the Apache License, Version 2.0 (the"License"); you may not use this file except in compliancewith the License. You may obtain a copy of the License at/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing,software distributed under the License is distributed on an"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANYKIND, either express or implied. See the License for thespecific language governing permissions and limitationsunder the License.--><!--| This is the configuration file for Maven. It can be specified at two levels:|| 1. User Level. This settings.xml file provides configuration for a single user,| and is normally provided in ${user.home}/.m2/settings.xml.|| NOTE: This location can be overridden with the CLI option:|| -s /path/to/user/settings.xml|| 2. Global Level. This settings.xml file provides configuration for all Maven| users on a machine (assuming they're all using the same Maven| installation). It's normally provided in| ${maven.conf}/settings.xml.|| NOTE: This location can be overridden with the CLI option:|| -gs /path/to/global/settings.xml|| The sections in this sample file are intended to give you a running start at| getting the most out of your Maven installation. Where appropriate, the default| values (values used when the setting is not specified) are provided.||--><settings xmlns="/SETTINGS/1.0.0"xmlns:xsi="/2001/XMLSchema-instance"xsi:schemaLocation="/SETTINGS/1.0.0 /xsd/settings-1.0.0.xsd"><!-- localRepository| The path to the local repository maven will use to store artifacts.|| Default: ${user.home}/.m2/repository<localRepository>/path/to/local/repo</localRepository>--><!-- 下处为添加的本地仓库的地址--><localRepository>D:\Data\WorkSpace\Maven\Maven-Repository</localRepository><!-- interactiveMode| This will determine whether maven prompts you when it needs input. If set to false,| maven will use a sensible default value, perhaps based on some other setting, for| the parameter in question.|| Default: true<interactiveMode>true</interactiveMode>--><!-- offline| Determines whether maven should attempt to connect to the network when executing a build.| This will have an effect on artifact downloads, artifact deployment, and others.|| Default: false<offline>false</offline>--><!-- pluginGroups| This is a list of additional group identifiers that will be searched when resolving plugins by their prefix, i.e.| when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers| "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.|--><pluginGroups><!-- pluginGroup| Specifies a further group identifier to use for plugin lookup.<pluginGroup>com.your.plugins</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></host><port>80</port><nonProxyHosts>|</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>--></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>/repo/path</url></mirror>--><!--以下为添加的镜像仓库--><mirror><id>alimaven</id><name>aliyun maven</name><url>/nexus/content/groups/public/</url><mirrorOf>central</mirrorOf></mirror><mirror><id>alimaven</id><mirrorOf>central</mirrorOf><name>aliyun maven</name><url>/nexus/content/repositories/central/</url></mirror><mirror><id>ibiblio</id><mirrorOf>central</mirrorOf><name>Human Readable Name for this Mirror.</name><url>/pub/mirrors/maven2/</url></mirror><mirror><id>jboss-public-repository-group</id><mirrorOf>central</mirrorOf><name>JBoss Public Repository Group</name><url>/nexus/content/groups/public</url></mirror><mirror><id>central</id><name>Maven Repository Switchboard</name><url>/maven2/</url><mirrorOf>central</mirrorOf></mirror><mirror><id>repo2</id><mirrorOf>central</mirrorOf><name>Human Readable Name for this Mirror.</name><url>/maven2/</url></mirror></mirrors><!-- profiles| This is a list of profiles which can be activated in a variety of ways, and which can modify| the build process. Profiles provided in the settings.xml are intended to provide local machine-| specific paths and repository locations which allow the build to work in the local environment.|| For example, if you have an integration testing plugin - like cactus - that needs to know where| your Tomcat instance is installed, you can provide a variable here such that the variable is| dereferenced during the build process to configure the cactus plugin.|| As noted above, profiles can be activated in a variety of ways. One way - the activeProfiles| section of this document (settings.xml) - will be discussed later. Another way essentially| relies on the detection of a system property, either matching a particular value for the property,| or merely testing its existence. Profiles can also be activated by JDK version prefix, where a| value of '1.4' might activate a profile when the build is executed on a JDK version of '1.4.2_07'.| Finally, the list of active profiles can be specified directly from the command line.|| NOTE: For profiles defined in the settings.xml, you are restricted to specifying only artifact| repositories, plugin repositories, and free-form properties to be used as configuration| variables for plugins in the POM.||--><profiles><!-- profile| Specifies a set of introductions to the build process, to be activated using one or more of the| mechanisms described above. For inheritance purposes, and to activate profiles via <activatedProfiles/>| or the command line, profiles have to have an ID that is unique.|| An encouraged best practice for profile identification is to use a consistent naming convention| for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.| This will make it more intuitive to understand what the set of introduced profiles is attempting| to accomplish, particularly when you only have a list of profile id's for debug.|| This profile example uses the JDK version to trigger activation, and provides a JDK-specific repo.<profile><id>jdk-1.4</id><activation><jdk>1.4</jdk></activation><repositories><repository><id>jdk14</id><name>Repository for JDK 1.4 builds</name><url>/maven/jdk14</url><layout>default</layout><snapshotPolicy>always</snapshotPolicy></repository></repositories></profile>--><!--| Here is another profile, activated by the system property 'target-env' with a value of 'dev',| which provides a specific path to the Tomcat instance. To use this, your plugin configuration| might hypothetically look like:|| ...| <plugin>| <groupId>org.myco.myplugins</groupId>| <artifactId>myplugin</artifactId>|| <configuration>|<tomcatLocation>${tomcatPath}</tomcatLocation>| </configuration>| </plugin>| ...|| NOTE: If you just wanted to inject this configuration whenever someone set 'target-env' to| anything, you could just leave off the <value/> inside the activation-property.|<profile><id>env-dev</id><activation><property><name>target-env</name><value>dev</value></property></activation><properties><tomcatPath>/path/to/tomcat/instance</tomcatPath></properties></profile>--></profiles><!-- activeProfiles| List of profiles that are active for all builds.|<activeProfiles><activeProfile>alwaysActiveProfile</activeProfile><activeProfile>anotherAlwaysActiveProfile</activeProfile></activeProfiles>--></settings>
