mybatisplus生成的mapper和bean,后置处理器实现根据bean获取mapper

最新推荐文章于 2024-08-12 21:17:39 发布

原创最新推荐文章于 2024-08-12 21:17:39 发布 · 844 阅读

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#mybatis #java #spring

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该文章介绍了一个名为MyBatisCommonMapper的类，它实现了BeanPostProcessor接口，用于在Spring中处理MyBatisPlus的Mapper和Bean。这个类能根据给定的Bean类获取对应的BaseMapper实例，通过存储和映射Mapper接口和工厂名称来实现这一功能。

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mybatisplus生成的mapper和bean,后置处理器实现根据bean获取mapper

package cc.ct.business.service.processor;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.mapper.MapperFactoryBean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.stereotype.Component;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author congrihe
 * @date 2023年02月21日 15:01
 */
@Component
@Slf4j
public class MyBatisCommonMapper implements BeanPostProcessor {
    private final static Map<String, BaseMapper<?>> MAPPER_INTERFACE = new ConcurrentHashMap<>();

    private final static Map<String,String> FACTORY_NANE = new ConcurrentHashMap<>();

    @SuppressWarnings("unchecked")
    public static <T> BaseMapper<T> getMapper(Class<T> t){
        return (BaseMapper<T>) MAPPER_INTERFACE.get(t.getName());
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof  BaseMapper){
            String mapperInterface = FACTORY_NANE.get(beanName);
            MAPPER_INTERFACE.put(mapperInterface,(BaseMapper<?>) bean);
        }
        return BeanPostProcessor.super.postProcessAfterInitialization(bean, beanName);
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof MapperFactoryBean){
            Class<?> mapperInterface = ((MapperFactoryBean<?>) bean).getMapperInterface();
            Type[] actualTypeArguments = ((ParameterizedType) (mapperInterface.getGenericInterfaces())[0])
                    .getActualTypeArguments();
            String typeName = actualTypeArguments[0].getTypeName();
            FACTORY_NANE.put(beanName,typeName);
        }
        return BeanPostProcessor.super.postProcessBeforeInitialization(bean, beanName);
    }


}

调用方式

 BaseMapper<?> mapper = MyBatisCommonMapper.getMapper(Bean.class);