自定义集合Map属性互转

自定义集合Map属性互转"/>

自定义集合Map属性互转

BeanCopyUtils-自定义集合Map属性互转

• 背景
• 提示
• 代码

背景

初次上班，写业务过程中发现项目里面没有common.lang3.BeanUtils类，只有spring自己引入的BeanUtils，只能copy单个对象，不能copy List或者Map，导致有些业务场景冗余代码过多，对后期维护不太友好， 限于公司不能随便加依赖以及改动项目整体架构，根据SpringFramework提供的Beanutils，就自己想到开发一个java bean copy工具类。

提示

我写的这个工具类是基于SpringFramework自带的BeanUtils写的。
第三方包都有提供这样的功能，如果各位小伙伴项目中有第三方BeanUtils工具类，可以直接用第三方包解决即可。

代码

/*** User实体类* @Author GaoJun* @Date Created in 14:34 2020/3/24*/
public class User {private Integer id;private String name;private String userName;public Integer getId() {return id;}public User() {}public User(Integer id, String name, String userName) {this.id = id;this.name = name;this.userName = userName;}@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", userName='" + userName + '\'' +'}';}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}
}

/*** User的Vo类* @Author GaoJun* @Date Created in 14:34 2020/3/24*/
public class UserVo {private Integer id;private String name;private String nameVo;public UserVo(Integer id, String name, String nameVo) {this.id = id;this.name = name;this.nameVo = nameVo;}public UserVo() {}@Overridepublic String toString() {return "UserVo{" +"id=" + id +", name='" + name + '\'' +", nameVo='" + nameVo + '\'' +'}';}public String getNameVo() {return nameVo;}public void setNameVo(String nameVo) {this.nameVo = nameVo;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

import org.springframework.beans.BeanUtils;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;/*** java bean copy工具类* 作用于：集合内属性互转* @Author GaoJun* @Date 15:45 2020/3/24* <pre>{@code List互转:*       List<User> users = Arrays.asList(new User(1, "name1", "user1"), new User(2, "name2", "user2"), new User(3, "name3", "user3"));*       List<UserVo> userVoList = BeanCopyUtils.copyListProperties(users,UserVo::new,(user,userVO) -> {*             userVO.setNameVo(user.getUserName());*       });*       sout:*          UserVo{id=1, name='name1', nameVo='user1'}*          UserVo{id=2, name='name2', nameVo='user2'}*          UserVo{id=3, name='name3', nameVo='user3'}* }</pre>* <pre>{@code Map互转:*       List<User> users = Arrays.asList(new User(1, "name1", "user1"), new User(2, "name2", "user2"), new User(3, "name3", "user3"));*       Map<String,List<User>> map = new HashMap<>();*          map.put("1",users);*       List<User> users1 = Arrays.asList(new User(11, "name11", "user11"), new User(22, "name22", "user22"), new User(33, "name33", "user33"));*         map.put("2",users1);*       Map<String, List<UserVo>> map1 = Utils.copyMapProperties(map, UserVo::new, (user,userVo) -> {*           userVo.setNameVo(user.getUserName());*       });*       sout:*       1: UserVo{id=1, name='name1', nameVo='user1'}*          UserVo{id=2, name='name2', nameVo='user2'}*          UserVo{id=3, name='name3', nameVo='user3'}*       2: UserVo{id=11, name='name11', nameVo='user11'}*          UserVo{id=22, name='name22', nameVo='user22'}*          UserVo{id=33, name='name33', nameVo='user33'}* }</pre>*/
public class BeanCopyUtils extends BeanUtils {/*** List数据的拷贝* @param sources: 数据源类* @param target:  目标类::new(eg: UserVO::new)* @return*/public static <S, T> List<T> copyListProperties(List<S> sources, Supplier<T> target) {return copyListProperties(sources, target, null);}/*** Map数据的拷贝* @param sources: 数据源类* @param target:  目标类::new(eg: UserVO::new)* @return*/public static  <K, S, T> Map<K, List<T>> copyMapProperties(Map<K, List<S>> sources, Supplier<T> target){return copyMapProperties(sources, target, null);}/*** 带回调函数的List数据的拷贝（可自定义字段拷贝规则）** @param sources:  数据源类* @param target:   目标类::new(eg: UserVO::new)* @param callBack: 回调函数* @return*/public static <S, T> List<T> copyListProperties(List<S> sources, Supplier<T> target, BeanCopyUtilCallBack<S, T> callBack) {List<T> list = new ArrayList<>(sources.size());for (S source : sources) {T t = target.get();copyProperties(source, t);list.add(t);if (callBack != null) {// 回调callBack.callBack(source, t);}}return list;}/*** 带回调函数的Map数据的拷贝（可自定义字段拷贝规则）* @param sources:  数据源类* @param target:   目标类::new(eg: UserVO::new)* @param callBack: 回调函数* @return*/public static <K, S, T> Map<K, List<T>> copyMapProperties(Map<K, List<S>> sources, Supplier<T> target, BeanCopyUtilCallBack<S, T> callBack){Map<K, List<T>> map = new HashMap<>(sources.size());for (Map.Entry<K, List<S>> source : sources.entrySet()) {List<T> ts = copyListProperties(source.getValue(), target, callBack);map.put(source.getKey(),ts);}return map;}
}
@FunctionalInterface
interface BeanCopyUtilCallBack <S, T> {/*** 定义默认回调方法* @param t* @param s*/void callBack(S t, T s);
}

import java.util.*;/*** Main测试类* @Author GaoJun* @Date Created in 14:37 2020/3/24*/
public class Test01 {public static void main(String[] args) {List<User> users = Arrays.asList(new User(1, "name1", "user1"), new User(2, "name2", "user2"), new User(3, "name3", "user3"));Map<String,List<User>> map = new HashMap<>();map.put("1",users);List<User> users2 = Arrays.asList(new User(11, "name11", "user11"), new User(22, "name22", "user22"), new User(33, "name33", "user33"));map.put("2",users2);Map<String, List<UserVo>> map1 = BeanCopyUtils.copyMapProperties(map, UserVo::new, (user,userVo) -> {userVo.setNameVo(user.getUserName());});map1.forEach((key,value) -> {System.out.print(key + "：");value.forEach(System.out::println);});}
}