Spring之WebMvcConfigurer类详解

一、WebMvcConfigurer介绍

WebMvcConfigurer配置类是Spring内部的一种配置方式，采用JavaBean的形式来代替传统的xml配置文件形式进行针对框架个性化定制。基于java-based方式的spring mvc配置，需要创建一个配置类并实现WebMvcConfigurer 接口，WebMvcConfigurerAdapter 抽象类是对WebMvcConfigurer接口的简单抽象（增加了一些默认实现）。

WebMvcConfigurerAdapter在SpringBoot2.0及Spring5.0中WebMvcConfigurerAdapter已被废弃 。

官方推荐直接实现WebMvcConfigurer或者继承WebMvcConfigurationSupport

二、WebMvcConfigurer类方法概览

package org.springframework.web.servlet.config.annotation;

import java.util.List;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.lang.Nullable;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;

public interface WebMvcConfigurer {
    default void configurePathMatch(PathMatchConfigurer configurer) {
    }

    default void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
    }

    default void configureAsyncSupport(AsyncSupportConfigurer configurer) {
    }

    default void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    }

    default void addFormatters(FormatterRegistry registry) {
    }

    default void addInterceptors(InterceptorRegistry registry) {
    }

    default void addResourceHandlers(ResourceHandlerRegistry registry) {
    }

    default void addCorsMappings(CorsRegistry registry) {
    }

    default void addViewControllers(ViewControllerRegistry registry) {
    }

    default void configureViewResolvers(ViewResolverRegistry registry) {
    }

    default void addArgumentResolvers(List resolvers) {
    }

    default void addReturnValueHandlers(List handlers) {
    }

    default void configureMessageConverters(List> converters) {
    }

    default void extendMessageConverters(List> converters) {
    }

    default void configureHandlerExceptionResolvers(List resolvers) {
    }

    default void extendHandlerExceptionResolvers(List resolvers) {
    }

    @Nullable
    default Validator getValidator() {
        return null;
    }

    @Nullable
    default MessageCodesResolver getMessageCodesResolver() {
        return null;
    }
}

三、 WebMvcConfigurer常用方法介绍

 /* 拦截器配置 */
void addInterceptors(InterceptorRegistry var1);

/* 视图跳转控制器 */
void addViewControllers(ViewControllerRegistry registry);

/* 静态资源处理 **/
void addResourceHandlers(ResourceHandlerRegistry registry);

/* 默认静态资源处理器 */
void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer);

/* 这里配置视图解析器 */
void configureViewResolvers(ViewResolverRegistry registry);

/* 配置内容裁决的一些选项*/
void configureContentNegotiation(ContentNegotiationConfigurer configurer);