将字典数据，配置在 yml 文件中，通过加载yml将数据加载到 Map中
Spring Boot 中 yml 配置、引用其它 yml 中的配置。# 在配置文件目录（如：resources）下新建application-xxx

必须以application开头的yml文件， 多个文件用 "," 号分隔，不能换行

项目结构文件

application.yml

server:
  port: 8088
  application:
    name: VipSoft Env Demo


spring:
  profiles:
    include:
      dic      # 在配置文件目录（如：resources）下新建application-xxx 开头的yml文件， 多个文件用 "," 号分隔，不能换行

#性别字典
user-gender:
  0: 未知
  1: 男
  2: 女

application-dic.yml
将字典独立到单独的yml文件中

#支付方式
pay-type:
  1: 微信支付
  2: 货到付款

在 resources 目录下，创建META-INF目录，创建 spring.factories文件，
Spring Factories是一种类似于Java SPI的机制，它在META-INF/spring.factories文件中配置接口的实现类名称，然后在程序中读取这些配置文件并实例化。
内容如下:

# Environment Post Processor
org.springframework.boot.env.EnvironmentPostProcessor=com.vipsoft.web.utils.ConfigUtil

ConfigUtil

package com.vipsoft.web.utils;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.context.properties.bind.BindResult;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.PropertySource;
import org.springframework.util.Assert;

public class ConfigUtil implements EnvironmentPostProcessor {

    private static Binder binder;

    private static ConfigurableEnvironment environment;

    public static String getString(String key) {
        Assert.notNull(environment, "environment 还未初始化！");
        return environment.getProperty(key, String.class, "");
    }

    public static <T> T bindProperties(String prefix, Class<T> clazz) {
        Assert.notNull(prefix, "prefix 不能为空");
        Assert.notNull(clazz, "class 不能为空");
        BindResult<T> result = ConfigUtil.binder.bind(prefix, clazz);
        return result.isBound() ? result.get() : null;
    }

    /**
    * 通过 META-INF/spring.factories，触发该方法的执行，进行环境变量的加载
    */
    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        for (PropertySource<?> propertySource : environment.getPropertySources()) {
            if (propertySource.getName().equals("refreshArgs")) {
                return;
            }
        }
        ConfigUtil.environment = environment;
        ConfigUtil.binder = Binder.get(environment);
    }
}

DictVo

package com.vipsoft.web.vo;


public class DictVO implements java.io.Serializable {
    private static final long serialVersionUID = 379963436836338904L;
    /**
     * 字典类型
     */
    private String type;
    /**
     * 字典编码
     */
    private String code;
    /**
     * 字典值
     */
    private String value;

    public DictVO(String code, String value) {
        this.code = code;
        this.value = value;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

DefaultController

package com.vipsoft.web.controller;

import com.vipsoft.web.utils.ConfigUtil;
import com.vipsoft.web.vo.DictVO;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;


@RestController
public class DefaultController {
    @GetMapping(value = "/")
    public String login() {
        return "VipSoft Demo !!!";
    }

    @GetMapping("/list/{type}")
    public List<DictVO> listDic(@PathVariable("type") String type) {
        LinkedHashMap dict = ConfigUtil.bindProperties(type.replaceAll("_", "-"), LinkedHashMap.class);
        List<DictVO> list = new ArrayList<>();
        if (dict == null || dict.isEmpty()) {
            return list;
        }
        dict.forEach((key, value) -> list.add(new DictVO(key.toString(), value.toString())));
        return list;
    }
}

运行效果