Spring超详细讲解BeanUtils改造

for (S source : sources) {
    T target = new T();
    copyProperties(source, target);
    list.add(target);
}

public Vo findById(Integer id) {
 Vo vo = new Vo();
 Po po = dao.findById(id);
 copyProperties(po, vo);
 return vo;
}

// 使用前
public Vo findById(Integer id) {
 Vo vo = new Vo();
 Po po = dao.findById(id);
 copyProperties(po, vo);
 return vo;
}
// 使用后
public Vo findById(Integer id) {
 return BeanConvertUtils.converTo(dao.findById(id), Vo::new);
}
// 使用后，通过lambda表达式特殊处理个别字段
public Vo findById(Integer id) {
 return BeanConvertUtils.converTo(dao.findById(id), Vo::new, 
  (s, t) -> t.setName(s.getName))
 );
}

// 使用前
public List<Vo> findAll() {
 List<Vo> vos = new ArrayList();
 List<Po> pos = dao.findAll();
 for (Po po : Pos) {
     Vo vo = new Vo();
     BeanUtis.copyProperties(po, vo);
     vos.add(vo);
    }
 return vos;
}
// 使用后
public List<Vo> findAll() {
 return BeanConvertUtils.converToList(dao.findAll(), Vo::new)
}
// 同样支持自定义lambda
public List<Vo> findAll() {
 return BeanConvertUtils.converToList(dao.findAll(), Vo::new,
  (s, t) -> t.setName(s.getName))
 )
}

import org.springframework.beans.BeanUtils;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;

public class BeanConvertUtils extends BeanUtils {
    
    public static <S, T> T convertTo(S source, Supplier<T> targetSupplier) {
        return convertTo(source, targetSupplier, null);
    }
    
    public static <S, T> List<T> convertListTo(List<S> sources, Supplier<T> targetSupplier) {
        return convertListTo(sources, targetSupplier, null);
    }
    
    public static <S, T> T convertTo(S source, Supplier<T> targetSupplier, ConvertCallBack<S, T> callBack) {
        if (null == source || null == targetSupplier) {
            return null;
        }
        T target = targetSupplier.get();
        copyProperties(source, target);
        if (callBack != null) {
            callBack.callBack(source, target);
        }
        return target;
    }
    
    public static <S, T> List<T> convertListTo(List<S> sources, Supplier<T> targetSupplier, ConvertCallBack<S, T> callBack) {
        if (null == sources || null == targetSupplier) {
            return null;
        }
        List<T> list = new ArrayList<>(sources.size());
        for (S source : sources) {
            T target = targetSupplier.get();
            copyProperties(source, target);
            if (callBack != null) {
                callBack.callBack(source, target);
            }
            list.add(target);
        }
        return list;
    }
    
    @FunctionalInterface
    public interface ConvertCallBack<S, T> {
        void callBack(S t, T s);
    }
}