Intellij在pom.xml中找不到Maven依赖项

传输org.springframework失败。boot:spring-boot-starter-parent:pom:2.0.4.RELEASE from https://repo.maven.apache.org/maven2 已缓存在本地存储库中,在经过central的更新间隔或强制更新之前,不会重新尝试解析。原始错误:无法传输项目org.springframework。boot:spring-boot-starter-parent:pom:2.0.4.RELEASE from/to 中央( ):repo.maven.apache.org

依赖关系的org.springframework。boot:spring-boot-starter-web:'找不到更少(Ctrl+F1)

插件org.springframework。boot:spring-boot-maven-plugin:2.0.4.释放“找不到更少…”(Ctrl+F1) 检查信息:检查Maven模型的解决问题。

下面是我的pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

<groupId>com.cierra</groupId>
<artifactId>spring-boot</artifactId>
<version>0.0.1-SNAPSHOT</version>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
</parent>


<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

<properties>
    <java.version>1.8</java.version>
</properties>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>2.0.4.RELEASE</version>
        </plugin>
    </plugins>
</build>


</project>