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错误：java：包 org.springframework.boot 不存在

我今天做了一个简单的应用程序，运行时出现了一些错误。我昨天做了另一个与这个非常相似的应用程序，它运行良好，但现在也坏了

我收到这些错误：

Error:(4, 32) java: package org.springframework.boot does not exist
Error:(5, 46) java: package org.springframework.boot.autoconfigure does not exist
Error:(6, 35) java: package org.springframework.context does not exist
Error:(9, 2) java: cannot find symbol
  symbol: class SpringBootApplication
Error:(13, 17) java: cannot find symbol
  symbol:   class ApplicationContext
  location: class com.example.dependencyinjection.DependencyInjectionApplication
Error:(13, 42) java: cannot find symbol
  symbol:   variable SpringApplication
  location: class com.example.dependencyinjection.DependencyInjectionApplication
Error:(3, 38) java: package org.springframework.stereotype does not exist
Error:(5, 2) java: cannot find symbol
  symbol: class Controller

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这是我的 pom.xml