对于初学者springboot报错，一般有以下原因。
1,你的application启动类的位置不对，已经application启动类放在目录的最外层。如图 我的MainApplication就在com.it包下，即最外层，所以它可以包含你所有的文件。
2要是用正确的注解，如下如果我想要在页面显示hello,spring boot2!,我的所在类所加注解为@RestController,我的映射方法注释为@RequestMapping
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