MVC配置原理

 

 

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {

// public interface ViewResolver 实现了视图解析器接口的类，我们就可以把它看做视图解析器

    @Bean
    public ViewResolver MyViewResolver(){
        return new MyViewResolver();
    }
    //自定义了一个自己的视图解析器
    public static class MyViewResolver implements ViewResolver{

        @Override
        public View resolveViewName(String s, Locale locale) throws Exception {
            return null;
        }
    }
}

 

设置视图跳转

package com.wang.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
        registry.addViewController("/index.html").setViewName("index");
        registry.addViewController("/main.html").setViewName("dashboard");

    }
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocalResolver();
    }

   
}

@EnableWebMvc这个注解添加时webMvc会被全面接管：因为WebMvcAutoConfiguration类上面有个条件注解

@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)只有当没有WebMvcConfigurationSupport类是webmvc配置才会生效，但是加入了

@EnableWebMvc后会引入一个DelegatingWebMvcConfiguration类，这个类继承了WebMvcConfigurationSupport，也就是说webmvc配置不会生效