package *************import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.alibaba.fastjson.serializer.SerializerFeature;import com.github.pagehelper.PageInfo;import com.google.common.collect.Lists;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.BeanUtils;import org.springframework.util.CollectionUtils;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.util.Collection;import java.util.List;import java.util.Objects;import java.util.function.Function;import java.util.stream.Collectors;/** * 对象之间转换工具类 */public class BeanUtil {    private static Logger log = LoggerFactory.getLogger(BeanUtil.class);    public static  T deepCopy(T obj) {        if (Objects.isNull(obj))            return null;        try {            ByteArrayOutputStream bos = new ByteArrayOutputStream();            ObjectOutputStream oos = new ObjectOutputStream(bos);            oos.writeObject(obj);            ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));            return (T) ois.readObject();        } catch (Exception e) {            log.error("对象深拷贝异常", e);            throw new ServiceException("对象深拷贝异常");        }    }    public static  R deepCopyWithJSON(T obj, Class rClass) {        if (Objects.isNull(obj))            return null;        //禁用 fastJSON 循环引用检测特性        String jsonObject = JSONObject.toJSONString(obj, SerializerFeature.DisableCircularReferenceDetect);        return JSON.parseObject(jsonObject, rClass);    }    /**     * 对象复制     * 支持 深度复制     * 不支持静态内部类的复制     *     * @param source     * @param target     * @param      * @param      * @return     */    @Deprecated    public static  R copy(F source, Class target) {        try {            R r = target.newInstance();            BeanUtils.copyProperties(r, source);            return r;        } catch (Exception e) {            throw new ServiceException(e);        }    }    /**     * 对象复制，采用spring的方法，速度更快     *     * @param source     * @param targetClass     * @param      * @param      * @return     */    public static  R copySpring(F source, Class targetClass) {        try {            if (source == null) return null;            R r = targetClass.newInstance();            BeanUtils.copyProperties(source, r);            return r;        } catch (Exception e) {            throw new ServiceException(e);        }    }    /**     * 列表复制     *     * @param col 原始列表     * @param c   转化对象     * @param      * @param      * @return 转化对象列表     */    public static  List copyList(Collection col, Class c) {        return CollectionUtils.isEmpty(col) ? Lists.newArrayList() : col.stream().map(s -> copySpring(s, c)).collect(Collectors.toList());    }    /**     * 忽略部分属性的拷贝     *     * @param source     * @param target     * @param ignoreProperties     * @param      * @param      * @return     */    public static  R copyIgnore(F source, Class target, String... ignoreProperties) {        try {            R r = target.newInstance();            BeanUtils.copyProperties(source, r, ignoreProperties);            return r;        } catch (Exception e) {            throw new ServiceException(e);        }    }    /**     * 消除空判断的三段表达式     *     * @param obj           箱要取的值     * @param defaultReturn 值为空时的默认值     * @param      * @return     */    public static  T getOrDefault(T obj, T defaultReturn) {        return getDefaultWithEqual(obj, null, defaultReturn);    }    /**     * 对象获取默认属性方法     * 
     * 代替类型：bean == null || bean.getId() == null ? 0 : bean.getId();     *     * @param obj           对象     * @param getFun        属性的get方法     * @param defaultReturn 默认值     * @param      * @param      * @return     */    public static  R getOrDefault(T obj, Function getFun, R defaultReturn) {        if (obj == null) {            return defaultReturn;        }        if (getFun.apply(obj) == null) {            return defaultReturn;        }        return getFun.apply(obj);    }    /**     * 如果需求值和期望值相等时，返回默认值     *     * @param obj           需求值     * @param equalVal      期望值     * @param defaultReturn 默认值     * @param      * @return     */    public static  T getDefaultWithEqual(T obj, T equalVal, T defaultReturn) {        if (equalVal == null && obj == null) {            return defaultReturn;        }        if (Objects.equals(equalVal, obj)) {            return defaultReturn;        }        return obj;    }    public static  PageInfo copyPage(PageInfo source, Class targetClass) {        try {            if (source == null) {                return null;            } else {                List rList = BeanUtil.copyList(source.getList(), targetClass);                PageInfo r = new PageInfo<>(rList);                r.setPageNum(source.getPageNum());                r.setPageSize(source.getPageSize());                r.setTotal(source.getTotal());                return r;            }        } catch (Exception var3) {            throw new ServiceException(var3);        }    }    public static  PageResult copyPage(PageResult source, Class targetClass) {        try {            if (source == null) {                return null;            } else {                List rList = BeanUtil.copyList(source.getResult(), targetClass);                return PageResult.create(rList, source.getTotal());            }        } catch (Exception e) {            throw new ServiceException(e);        }    }    }

使用

public static void main(String[] args) {        DftTask task = new DftTask();        task.setMonthBuy(BigDecimal.ONE);        DftTask task2 = copySpring(task,DftTask.class);        System.out.println(JSON.toJSON(task));        System.out.println(JSON.toJSON(task2));    }