在application.properties中

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mybatis.configuration.map-underscore-to-camel-case=true

在application.yml

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mybatis:
  configuration:
    map-underscore-to-camel-case: true

配置类：

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@org.springframework.context.annotation.Configuration
public class MybatisConfig {
	
	@Bean
	public ConfigurationCustomizer configurationCustomizer() {
		
		return new ConfigurationCustomizer() {
			
			@Override
			public void customize(Configuration configuration) {
				configuration.setMapUnderscoreToCamelCase(true);
				
			}
		};
	}
}

mybatis.xml

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<configuration>
    <!--开启驼峰命名规则自动转换-->
    <settings>
    <setting name="mapUnderscoreToCamelCase" value="true" />
    </settings>
</configuration>