eclipse使用C:\ Users \ firstname.lastname.m2文件夹中的默认maven settings.xml文件.

Check Is setting.xml in  C:\Users\firstname.lastname\.m2 Folder exist or not. 

如果settings.xml文件不是它们，则只需插入settings.xml.

If settings.xml file is not their just insert settings.xml.

mvn clean install spring-boot:run

您可以在maven> conf文件夹中获取settings.xml文件，例如，我在d:驱动器D:\中提取了maven zip，驱动器使用apache-maven-3.5.4文件夹名称，因此我的settings.xml文件在D中:\ apache-maven-3.5.4 \ conf

You can get the settings.xml File inside the maven> conf folder e.g I extract maven zip in my d: drive D:\ Drive with apache-maven-3.5.4 folder name so my settings.xml file is in D:\apache-maven-3.5.4\conf