maven具体报错提示如下：
Description Resource Path Location Type
ArtifactDescriptorException: Failed to read artifact descriptor for org.springframework.boot:spring-boot-starter-thymeleaf:jar:1.5.10.RELEASE: ArtifactResolutionException: Failure to transfer org.springframework.boot:spring-boot-starter-thymeleaf:pom:1.5.10.RELEASE from http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.springframework.boot:spring-boot-starter-thymeleaf:pom:1.5.10.RELEASE from/to central (http://repo.maven.apache.org/maven2): connect timed out pom.xml /hello-springboot line 1 Maven Dependency Problem
经发现：
spring-boot-starter-thymeleaf未下载完全，所以需要先删除后更新。
删除前：
删除更新后：
经对比，明显发现之前确实出现了下载中断问题。
问题原因：
springboot后台无法直接访问html，采用thymeleaf出现maven报错，误以为spring-boot里面已经有thymeleaf。但不加入thymeleaf依赖无法访问，springboot
从1.5.10切换到1.4.7可以顺利加thymeleaf依赖。后经maven错误提示定位问题错误：
调整后，顺利访问html页面：
