解决“Caused by: org.gradle.api.plugins.UnknownPluginException: Plugin with id 'org.springframework.boot' not found.”

升级老项目spring boot 和 cloud版本之后 gradle clean 报错：“Caused by: org.gradle.api.plugins.UnknownPluginException: Plugin with id 'org.springframework.boot' not found.”

原来的build.gradle 中是这样的：

buildscript {
ext {
springBootVersion = '2.1.6.RELEASE'
}
repositories {
mavenCentral()

mavenLocal()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}

而我本地这个文件夹并没有springboot的最新版本依赖，所以会提示找不到sringboot