1 Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans view resolver
https://docs.spring.io/spring-boot/docs/2.1.6.RELEASE/reference/html/boot-features-developing-web-applications.html
What configuration has SpringBoot made to our SpringMVC, including how Extension, how to customize.
Spring MVC Auto-configuration
// Spring Boot为Spring MVC提供了自动配置，它可以很好地与大多数应用程序一起工作。
Spring Boot provides auto-configuration for Spring MVC that works well with most applications.
// 自动配置在Spring默认设置的基础上添加了以下功能：
The auto-configuration adds the following features on top of Spring’s defaults:
// 包含视图解析器
Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans.
// 支持静态资源文件夹的路径，以及webjars
Support for serving static resources, including support for WebJars
// 自动注册了Converter：
// 转换器，这就是我们网页提交数据到后台自动封装成为对象的东西，比如把"1"字符串自动转换为int类型
// Formatter：【格式化器，比如页面给我们了一个2019-8-10，它会给我们自动格式化为Date对象】
Automatic registration of Converter, GenericConverter, and Formatter beans.
// HttpMessageConverters
// SpringMVC用来转换Http请求和响应的的，比如我们要把一个User对象转换为JSON字符串，可以去看官网文档解释；
Support for HttpMessageConverters (covered later in this document).
// 定义错误代码生成规则的
Automatic registration of MessageCodesResolver (covered later in this document).
// 首页定制
Static index.html support.
// 图标定制
Custom Favicon support (covered later in this document).
// 初始化数据绑定器：帮我们把请求数据绑定到JavaBean中！
Automatic use of a ConfigurableWebBindingInitializer bean (covered later in this document).
/*
如果您希望保留Spring Boot MVC功能，并且希望添加其他MVC配置（拦截器、格式化程序、视图控制器和其他功能），则可以添加自己
的@configuration类，类型为webmvcconfiguer，但不添加@EnableWebMvc。如果希望提供
RequestMappingHandlerMapping、RequestMappingHandlerAdapter或ExceptionHandlerExceptionResolver的自定义
实例，则可以声明WebMVCregistrationAdapter实例来提供此类组件。
*/
If you want to keep Spring Boot MVC features and you want to add additional MVC configuration
(interceptors, formatters, view controllers, and other features), you can add your own
@Configuration class of type WebMvcConfigurer but without @EnableWebMvc. If you wish to provide
custom instances of RequestMappingHandlerMapping, RequestMappingHandlerAdapter, or
ExceptionHandlerExceptionResolver, you can declare a WebMvcRegistrationsAdapter instance to provide such components.
// 如果您想完全控制Spring MVC，可以添加自己的@Configuration，并用@EnableWebMvc进行注释。
If you want to take complete control of Spring MVC, you can add your own @Configuration annotated with @EnableWebMvc.
MyMvcConfig.java
package com.zs.helloword.config;
// 全面扩展springmvc
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.Locale;
/**
* 如果您希望保留Spring Boot MVC功能，并且希望添加其他MVC配置（拦截器、格式化程序、视图控制器和其他功能），则可以添加自己
* 的@configuration类，类型为webmvcconfiguer，但不添加@EnableWebMvc。如果希望提供
* RequestMappingHandlerMapping、RequestMappingHandlerAdapter或ExceptionHandlerExceptionResolver的自定义
* 实例，则可以声明WebMVCregistrationAdapter实例来提供此类组件。
*/
// 如果自定义定制化的功能 只需要写组件 将它交给springBoot springBoot就会自动装配
// 扩展springmvc 所有的请求会发给 dispatchservlet
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
// 自定义的springMVC的配置
// 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的类 ViewResolver
@Bean
public ViewResolver myViewResolver() {
return new MyViewResolver();
}
// 自定义了一个视图解析器 ---> 如何将它放到Bean里面呢
public static class MyViewResolver implements ViewResolver {
@Override
public View resolveViewName(String s, Locale locale) throws Exception {
return null;
}
}
}
2 Automatic registration of Converter, GenericConverter, and Formatter beans
Formatter: [Formatter, such as the page gives us a 2019-8-10, it will automatically format us as a Date object]
We can application.yaml
jump in the view.
If you add an @EnableWebMvc
example, @EnableWebMvc // 导入一个类DelegatingWebMvcConfiguration.class : 从容器中获取所有WebMvcConfigurer
pay special attention to WebMvcAutoConfiguration.classthe prerequisites to take effect.
If we MyMvcConfig.classadd **@EnaleWebMvc, this WebMvcAutoConfiguration will all fail, so we can’t add @EnaleWebMvc**
@EnableWebMvc to import the WebMvcConfigurationSupport component, and import it The WebMvcConfigurationSupport is just the most basic function of SpringMVC!