问题： idea中无法下载源码问题

Cannot download sources
			Sources not found for:org.springframework.boot:spring-boot-autoconfigure:2.3.4.RELEASE

解决方式一：

检查自己的maven仓库配置是否存在错误：仓库配置参考：

<mirror>
  <id>aliyunmaven</id>
  <mirrorOf>*</mirrorOf>
  <name>阿里云公共仓库</name>
  <url>https://maven.aliyun.com/repository/public</url>
</mirror>

解决方式二：

【检查方式maven正确情况下，再执行本步骤】则在项目下，项目根目录下 或 pom.xml同级目录中执行

mvn dependency:resolve -Dclassifier=sources

然后点击“download source”时就能看到源码了。

$ mvn dependency:resolve -Dclassifier=sources
[INFO] Scanning for projects...
Downloading from ...
...
[INFO]
...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  01:06 min
[INFO] Finished at: 2021-02-03T21:30:26+08:00
[INFO] ------------------------------------------------------------------------