MapperScannerConfigurer中获取applicayion.yml配置，进行动态加载BasePackage

由于在MapperScannerConfigurer的bean 优先于@value，导致@value取出来的时候都是null,所以只能使用Environment 来获取值

import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
 
@Configuration
public class MyBatisConfig {
 
    @Value("${mybatis.mapper.basePackage}")
    private String basePackage;
 
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(Environment environment) {
　　　 　environment.getProperty("xxx.xxxx")
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        // 如果需要使用环境变量中的值，可以这样设置
        mapperScannerConfigurer.setBasePackage(environment.getProperty("mybatis.mapper.basePackage"));
        // 其他配置...
        return mapperScannerConfigurer;
    }
}