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BeanUtils拷贝List数据

news 来源：原创 2024/7/7 10:23:46

工具类：

package com.ssdl.baize.pub;import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
import org.springframework.beans.BeanUtils;public class BeanConvertUtils extends BeanUtils {public static <S, T> T convertTo(S source, Supplier<T> targetSupplier) {return convertTo(source, targetSupplier, null);}/*** 转换对象* @param source         源对象* @param targetSupplier 目标对象供应方* @param callBack       回调方法* @param <S>            源对象类型* @param <T>            目标对象类型* @return 目标对象*/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) {return convertListTo(sources, targetSupplier, null);}/*** 转换对象* @param sources        源对象list* @param targetSupplier 目标对象供应方* @param callBack       回调方法* @param <S>            源对象类型* @param <T>            目标对象类型* @return 目标对象list*/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;}/*** 回调接口** @param <S> 源对象类型* @param <T> 目标对象类型*/@FunctionalInterfacepublic interface ConvertCallBack<S, T> {void callBack(S t, T s);}/*** 将源列表中的数据复制到目标列表中，并返回目标列表。** @param sourceList 源列表* @param targetClass 目标列表中元素的类* @return 目标列表*/public static <S, T> List<T> copyList(List<S> sourceList, Class<T> targetClass) {List<T> targetList = new ArrayList<>();for (S source : sourceList) {T target;try {target = targetClass.getDeclaredConstructor().newInstance();BeanUtils.copyProperties(target, source);targetList.add(target);} catch (InstantiationException | IllegalAccessException | InvocationTargetException| NoSuchMethodException e) {// 处理异常e.printStackTrace();}}return targetList;}
}

方法测试：

package com.ssdl.baize.pub;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.junit.Test;import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;public class Test01 {public static void main(String[] args) {}@Testpublic  void test01(){// 创建源对象列表List<SourceEntity> sourceList = new ArrayList<>();sourceList.add(new SourceEntity(1L, "张三"));sourceList.add(new SourceEntity(2L, "李四"));sourceList.add(new SourceEntity(3L, "王五"));// 定义目标对象的供应方（Supplier）Supplier<TargetDTO> targetSupplier = TargetDTO::new;// 转换对象列表List<TargetDTO> targetList = BeanConvertUtils.convertListTo(sourceList, targetSupplier, (source, target) -> {// 可以在回调函数中进行额外的处理   比如特定字段的赋值等target.setId(source.getId());});// 输出转换后的目标对象列表for (TargetDTO dto : targetList) {System.out.println("ID: " + dto.getId() + ", Name: " + dto.getName());}}@Testpublic  void test02(){// 单个对象SourceEntity zhangSan = new SourceEntity(1L, "张三");TargetDTO targetDTO = BeanConvertUtils.convertTo(zhangSan, TargetDTO::new);System.out.println("单个对象:"+targetDTO);// 单个对象某字段特殊处理TargetDTO targetDTO1 = BeanConvertUtils.convertTo(zhangSan, TargetDTO::new, (a, b) -> {Long id = a.getId();if (1L==id){b.setId(2L);}});System.out.println("单个对象某字段特殊处理:"+targetDTO1);}@Data@AllArgsConstructor@NoArgsConstructorstatic class SourceEntity {private Long id;private String name;}@Data@AllArgsConstructor@NoArgsConstructorstatic class TargetDTO {private Long id;private String name;}
}