SpringBoot:通过WebMvcConfigurer来动态修改请求映射

通常情况下，通过@RequestMapping注解来完成请求映射，我们也可以通过WebMvcConfigurer来修改请求映射。
示例：
将带@Anno注解的controller的路径映射加上/anno前缀，
一、注解定义：

package com.example.anno;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnno {
}

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二、controller定义，加上@MyAnno注解：

package com.example.controller;

import com.example.anno.MyAnno;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@MyAnno
public class AnnoController {
    @RequestMapping("/my")
    public String getAnno(){
        return "this is annotation!";
    }
}

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三、配置WebMvcConfigurer

package com.example.config;

import com.example.anno.MyAnno;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
public class MyConfig {

    @Bean
    WebMvcConfigurerAdapter getWebMvcConfigurer(){
        return new WebMvcConfigurerAdapter() {
            @Override
            public void configurePathMatch(PathMatchConfigurer configurer){
                configurer.addPathPrefix("anno",c -> c.isAnnotationPresent(MyAnno.class));

            }
        };
    }

}

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四、访问请求：
ip:port/anno/my