场景：
应用MyBatis Plus 和通用Mapper
继承自ServiceImpl实现对Service里的方法进行包装再处理。
public interface IServiceBase2<T extends AbstractDTO> {
}
public class ServiceBaseImpl2<M extends BaseMapper<P>,P extends Model<P>,D extends AbstractDTO> extends ServiceImpl<M,P> implements IServiceBase2<D> {
private Class<P> poClazz;
private Class<D> dtoClazz;
public ServiceBaseImpl2(){
Type superClass = getClass().getGenericSuperclass();
if (superClass instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) superClass;
Type[] types = parameterizedType.getActualTypeArguments();
if (types != null && types.length == 3) {
if (types[1] instanceof Class) {
poClazz = (Class<P>) types[1];
}
if (types[2] instanceof Class) {
dtoClazz = (Class<D>) types[2];
}
}
}
}
@Override
public D selectByIdDTO(Serializable var1) throws ClassNotFoundException, IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException {
P p = super.selectById(var1);
String classPath = poClazz.getName() + "POJOMapperImpl";// "com.api.modular.clinicalcase.dto.mapper.ClinicalcasePOJOMapperImpl";
classPath = classPath.replace("model","dto.mapper");
Class mapperClazz = Class.forName(classPath);
Object newInstance = mapperClazz.newInstance();
Method[] methods = mapperClazz.getMethods();
Method method = mapperClazz.getMethod("doToDto", poClazz);
D result = (D) method.invoke(newInstance, p);
return result;
}
}
错误：
启动项目报错：No qualifying bean of type 'com.baomidou.mybatisplus.mapper.BaseMapper<?>' available: expected single matching bean but found 4
解决：
将ServiceBaseImpl 更改为抽象类
public abstract class ServiceBaseImpl2<M extends BaseMapper<P>,P extends Model<P>,D extends AbstractDTO> extends ServiceImpl<M,P> implements IServiceBase2<D> {
}