spring+mybatis 返回值為map時返回駝峰命名

<resultMap id ="UserInfoMap" type="com.example.mybaitsxml.dao.entity.User">
        <result column="name_" property="name"/>
        <result column="sex" property="sex"/>
        <result column="age" property="age"/>
        <result column="class_no" property="classNo"/>
    </resultMap>
<resultMap id ="UserInfoMap" type="map">
        <result column="name_" property="name"/>
        <result column="sex" property="sex"/>
        <result column="age" property="age"/>
        <result column="class_no" property="classNo"/>
    </resultMap>
<select id="find" parameterType="map' resultType="UserInfoMap">
</select>

第二種：

application配置：

map-underscore-to-camel-case: true

mybatis-plus:
  mapper-locations: classpath*:org/jeecg/modules/**/xml/*Mapper.xml
  global-config:
    # 關閉MP3.0自帶的banner
    banner: false
    db-config:
      #主鍵類型  0:"數據庫ID自增",1:"該類型為未設置主鍵類型", 2:"用戶輸入ID",3:"全局唯一ID (數字類型唯一ID)", 4:"全局唯一ID UUID",5:"字符串全局唯一ID (idWorker 的字符串表示)";
      id-type: 4
      # 默認數據庫表下划線命名
      table-underline: true
  configuration:
    #返回Map的時候,將Map內的Key轉換為駝峰的命名表達式
    map-underscore-to-camel-case: true
    # 這個配置會將執行的sql打印出來，在開發或測試的時候可以用
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

新建工具類：

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;
        }

        /**
         * 將下划線風格替換為駝峰風格
         *
         * @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();
        }
    }

}