When the return spring + camelCase return value map mybatis

application configuration:

map-underscore-to-camel-case: true

mybatis-plus:
  mapper-locations: classpath*:org/jeecg/modules/**/xml/*Mapper.xml
  global-config:
    # Close MP3.0 own banner
    banner: false
    db-config:
      # Primary Key Type 0: "Database ID increment", 1: "The type of the primary key type is not set," 2: "the user enters ID". 3: "Globally Unique ID (numeric unique ID)". 4: "Global unique ID UUID ", 5:" string globally unique ID (idWorker string representation) ";
      id-type: 4
      # Default database table names underlined
      table-underline: true
  configuration:
    Map # returns when converting Key in the Map is named expressions hump
    map-underscore-to-camel-case: true
    sql # This configuration will be executed to print out, when developing or testing can be used
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

New tools:

package org.jeecg.config.mybatis;

import com.baomidou.mybatisplus.autoconfigure.ConfigurationCustomizer;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.wrapper.MapWrapper;
import org.apache.ibatis.reflection.wrapper.ObjectWrapper;
import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Map;

@Configuration
public class MybatisConfig {
    @Bean
    public ConfigurationCustomizer configurationCustomizer() {
        return configuration -> configuration.setObjectWrapperFactory(new MapWrapperFactory());
    }


    static class MapWrapperFactory implements ObjectWrapperFactory {
        @Override
        public boolean hasWrapperFor(Object object) {
            return object != null && object instanceof Map;
        }

        @Override
        public ObjectWrapper getWrapperFor(MetaObject metaObject, Object object) {
            return new MyMapWrapper(metaObject, (Map) object);
        }
    }

    static class MyMapWrapper extends MapWrapper {
        MyMapWrapper(MetaObject metaObject, Map<String, Object> map) {
            super(metaObject, map);
        }

        @Override
        public String findProperty(String name, boolean useCamelCaseMapping) {
            if (useCamelCaseMapping
                    && ((name.charAt(0) >= 'A' && name.charAt(0) <= 'Z')
                    || name.contains("_"))) {
                return underlineToCamelhump(name);
            }
            return name;
        }

        /**
         * Replaces underlined style hump style
         *
         * @param inputString
         * @return
         */
        private String underlineToCamelhump(String inputString) {
            StringBuilder sb = new StringBuilder();

            boolean nextUpperCase = false;
            for (int i = 0; i < inputString.length(); i++) {
                char c = inputString.charAt(i);
                if (c == '_') {
                    if (sb.length() > 0) {
                        nextUpperCase = true;
                    }
                } else {
                    if (nextUpperCase) {
                        sb.append(Character.toUpperCase(c));
                        nextUpperCase = false;
                    } else {
                        sb.append(Character.toLowerCase(c));
                    }
                }
            }
            return sb.toString();
        }
    }

}