进入spring 官网
https://spring.io/projects/spring-framework

点击GitHub图标
找到对应想下载的版本

查看官网说明，点击Build from Source


修改 源码包下 build.gradle文件配置内容。更改Maven仓库为阿里云仓库

repositories {
				maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
				maven{ url 'https://maven.aliyun.com/nexus/content/repositories/jcenter'}
			}

修改这里面的Maven地址

cmd到spring源码下：执行gradlew :spring-oxm:compileTestJava

导入idea
(File -> New -> Project from Existing Sources -> Navigate to directory -> Select build.gradle)
完成导入。