maven无法自动下载依赖包settings.xml文件配置

问题：springboot项目中，在pom.xml配置了依赖引用不会自动下载

需要设置maven的settings.xml文件

查看对应目录是否存在settings.xml文件

如果没有则需要添加文件settings.xml到该目录，文件内容如下:

<?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">

    <!-- 本地仓库的位置 -->
    <localRepository>${user.home}/.m2/repository</localRepository>
  
    <!-- Apache Maven 配置 -->
    <pluginGroups/>
    <proxies/>

    <!-- 私服发布的用户名密码 -->
    <servers>
        <server>
            <id>releases</id>
            <username>deployment</username>
            <password>He2019</password>
        </server>
        <server>
            <id>snapshots</id>
            <username>deployment</username>
            <password>He2019</password>
        </server>
    </servers>
    
    <!-- 阿里云镜像 -->
    <mirrors>
        <mirror>
            <id>alimaven</id>
            <name>aliyun maven</name>
            <!-- https://maven.aliyun.com/repository/public/ -->
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <mirrorOf>central</mirrorOf>
        </mirror>
    </mirrors>

    <!-- 配置: java8, 先从阿里云下载, 没有再去私服下载  -->
    <!-- 20190929 hepengju 测试结果: 影响下载顺序的是profiles标签的配置顺序(后面配置的ali仓库先下载), 而不是activeProfiles的顺序 -->
    <profiles>
        <!-- 全局JDK1.8配置 -->
        <profile>
            <id>jdk1.8</id>
            <activation>
                <activeByDefault>true</activeByDefault>
                <jdk>1.8</jdk>
            </activation>
            <properties>
                <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
                <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>

        
        <!-- Nexus私服配置: 第三方jar包下载, 比如oracle的jdbc驱动等 -->
        <profile>
            <id>dev</id>
            <repositories>
                <repository>
                    <id>nexus</id>
                    <url>http://nexus.hepengju.cn:8081/nexus/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>public</id>
                    <name>Public Repositories</name>
                    <url>http://nexus.hepengju.cn:8081/nexus/content/groups/public/</url>
                </pluginRepository>
            </pluginRepositories>
        </profile>
        
        <!-- 阿里云配置: 提高国内的jar包下载速度 -->
        <profile>
            <id>ali</id>
            <repositories>
                <repository>
                    <id>alimaven</id>
                    <name>aliyun maven</name>
                    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>alimaven</id>
                    <name>aliyun maven</name>
                    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
                </pluginRepository>
            </pluginRepositories>
        </profile>

    </profiles>
    
    <!-- 激活配置 --> 
    <activeProfiles>
        <activeProfile>jdk1.8</activeProfile>
        <activeProfile>dev</activeProfile>
        <activeProfile>ali</activeProfile>
    </activeProfiles>
</settings>

       maven的settings文件说明：  https://yq.aliyun.com/articles/625836?spm=a2c4e.11153940.0.0.b2133f1avcLO9w

　　maven的pom文件的说明：https://yq.aliyun.com/articles/626435?spm=a2c4e.11155435.0.0.1cf4a46c25Bwgd

 添加完之后刷新maven即可重新下载