idea出现 无法解析MVC“xxx” 以及 “index”无法找到

1. jar包依赖未引入

正确maven构建jar包如下

        
            org.thymeleaf
            thymeleaf-spring5
            3.0.14.RELEASE
        
        
            org.thymeleaf
            thymeleaf
            3.0.14.RELEASE
        

2. 配置文件配置错误，以及配置文件上下文路径设置错误

配置文件如下

       
   

    
    
    
    
        
            
            
                
                
                    
                        text/html
                        application/json
                    
                
            
        
    
    
    

3. 配置文件不生效，依旧报错视图MVC无法解析，可以使用配置类解决

package com.bookstore.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.thymeleaf.spring5.SpringTemplateEngine;
import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;



@Configuration
@EnableWebMvc
@ComponentScan(value = "com.bookstore.controller", includeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Controller.class)})
public class SpringMVCConfig implements WebMvcConfigurer {
    public final static String CHARACTER_ENCODING = "UTF-8";

    // thymeleaf模板引擎参数
    public final static String TEMPLATE_PREFIX = "/WEB-INF/templates/";
    public final static String TEMPLATE_SUFFIX = ".html";
    public final static Boolean TEMPLATE_CACHEABLE = false;
    public final static String TEMPLATE_MODE = "HTML5";
    public final static Integer TEMPLATE_ORDER = 1;


    //模板解析器
    @Bean
    public SpringResourceTemplateResolver templateResolver() {
        SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
        templateResolver.setPrefix(TEMPLATE_PREFIX);
        templateResolver.setSuffix(TEMPLATE_SUFFIX);
        templateResolver.setCacheable(TEMPLATE_CACHEABLE);
        templateResolver.setCharacterEncoding(CHARACTER_ENCODING);
        templateResolver.setTemplateMode(TEMPLATE_MODE);
        templateResolver.setOrder(TEMPLATE_ORDER);
        return templateResolver;
    }

    //模板引擎
    @Bean
    public SpringTemplateEngine springTemplateEngine(SpringResourceTemplateResolver templateResolver) {
        SpringTemplateEngine springTemplateEngine = new SpringTemplateEngine();
        springTemplateEngine.setTemplateResolver(templateResolver);
        return springTemplateEngine;
    }

    //视图解析器
    @Bean
    public ThymeleafViewResolver viewResolver(SpringTemplateEngine springTemplateEngine) {
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
        viewResolver.setTemplateEngine(springTemplateEngine);
        viewResolver.setCharacterEncoding(CHARACTER_ENCODING);
        return viewResolver;
    }



}