创建maven项目时pom.xml时：
出现如下报错信息：
Failure to transfer commons-lang:commons-lang:jar:2.1 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact commons-lang:commons-lang:jar:2.1 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.
解决方法
点击菜单的 Window→preferences→meaven→User Settings
在Global Settings： 中 点击Browse...
选择路径：D:\java\DTools\DTools\apache-maven-3.3.9\conf\settings.xml （找到settings.xml 文件）
如下是settings.xml 的代码
<?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>
</pluginGroups>
<proxies>
</proxies>
<servers>
</servers>
<mirrors>
<mirror>
<id>tedu</id>
<name>Tedu Maven</name>
<mirrorOf>*</mirrorOf>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
<!-- <url>http://maven.oschina.net/content/groups/public</url> -->
</mirror>
</mirrors>
<profiles>
</profiles>
<activeProfiles>
</activeProfiles>
</settings>