五、Spring Boot WebMvcConfigurerAdapter 过时问题

Spring Boot 2.0之后 WebMvcConfigurerAdapter 已过时

可以将 已过时的 WebMvcConfigurerAdapter 换成 WebMvcConfigurer

WebMvcConfigurer 接口 源码如下：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

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 {
	//Spring Boot 配置自己的 path 匹配规则
    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) {
    }
	
	//配置视图映射
    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;
    }
}

WebMvcConfigurer 的实现类

package com.kino.springboot04.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * Created by RM on 2018/9/30.
 */
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {

    /**
     * Spring Boot 配置自己的 path 匹配规则
     * @param configurer
     */
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        // 常用的两种
        // 匹配结尾 / :会识别 url 的最后一个字符是否为 /
        // localhost:8080/test 与 localhost:8080/test/ 等价
        configurer.setUseTrailingSlashMatch(true);
        // 匹配后缀名：会识别 xx.* 后缀的内容
        // localhost:8080/test 与 localhost:8080/test.jsp 等价
        configurer.setUseSuffixPatternMatch(true);
    }


    /**
     * 浏览器发指定请求到指定页面
     * @param registry
     */
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");
    }
}