报错：This application has no explicit mapping for /error, so you are seeing this as a fallback.

1、报错信息

上面这句话大概的意思“这个应用没有明确的映射/错误，所以你才会看到这样一个返回结果”。

2、解决方案

2.1 Application启动类的位置不对

要将Application启动类放在最外侧，这样才会自动加载启动类所在包下及其子包下的所有组件。在这总结确认了目前的三种错误案例。

SpringBoot项目的Bean装配是根据Application类所在的包位置从上往下扫描！“Application类”是指SpringBoot项目入口类，这个类的位置很关键：

如果Application类所在的包为：com.boot.app，则只会扫描com.boot.app包及其所有子包，如果service或dao所在包不在com.boot.app及其子包下，则不会被扫描！

第一种，Application启动类直接放在了java包下面，这个在编译器就会报错（自己就犯了这个错误）
第二种，controller类跟Application启动类在同级包的不同包下边
第三种，启动类范围小于组件的位置范围
正确位置：在组件的同包或者组件的外层包内都可以，总之启动类的位置范围应大于或者等于组件所在位置。

2.2 在springboot的配置文件:application.yml或application.properties中关于视图解析器的配置问题（暂未碰到，后期碰到后再补充）

# 当pom文件下的spring-boot-starter-paren版本高时使用：
spring.mvc.view.prefix =
spring.mvc.view.suffix =# 当pom文件下的spring-boot-starter-paren版本低时使用:
spring.view.prefix =
spring.view.suffix =

application.properties

server.port=8080#设置Tomcat编码
server.tomcat.uri-encoding=UTF-8
#设置视图解析器路径
spring.mvc.view.prefix=/WEB-INF/views/
#设置视图解析器后缀
spring.mvc.view.suffix=.jsp

application.yml

server:port: 8080tomcat: uri-encoding: UTF-8
spring:mvc: view: prefix: /WEB-INF/views/ suffix: .jsp

2.3 控制器的URL路径书写问题：

@RequestMapping(“xxx”) ，实际访问的路径与”xxx”不符合

参考：https://www.geek-share.com/detail/2806107339.html
参考：https://www.huaweicloud.com/articles/a100d866b05b05e23ef6c7439d4b98cc.html

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