异常:This application has no explicit mapping for /error.以及spring.mvc.view.prefix配置解决

《Spring Boot实战派》实例7实现MVC模式的Web应用程序遇到的问题

Error resolving template [mvcdemo], template might not exist or might not be accessible
by any of the configured Template Resolvers] with root cause

主要原因是模板没找到，说明resource文件可能有问题

第一步：
确保启动文件的位置，这里是MvcDemoApplication,放在最外侧，和子包并列或者处于外侧，这里的子包是contrller和model ，spring-boot会自动加载启动类所在包及其子包下的所有组件

第二步：
需要配置application.properties文件中视图解析器，笔者这一步出现错误
需要配置成如下

#配置前缀
#spring.thymeleaf.prefix=classpath:/templates/
#配置后缀
#spring.thymeleaf.suffix=.html

Thymeleaf模版默认会使用templates作为视图文件

第三步
注意@Controller中试图模板的名字和resource文件下的html文件名字相匹配。

  //定义mvc中的视图模板ModelAndView modelAndView=new ModelAndView("mvcdemo");//需要和html文件名相匹配

第四步
确保@GetMapping("/mvcdemo")和控制器url访问路径一致

参考博客SpringBoot—静态页面加载
参考博客异常:This application has no explicit mapping for /error, so you are seeing this as a fallback.

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