1.更改了WEB-INF的位置，使其更加规范

2.更改了yml中的前缀：prefix: /WEB-INF/jsp/

src/main/resources/application.yml

@@ -4,7 +4,7 @@ server:
 spring:
   mvc:
     view:
-      prefix: /jsp/
+      prefix: /WEB-INF/jsp/
       suffix: .jsp
   datasource:
     driver-class-name: com.mysql.cj.jdbc.Driver