import io.swagger.annotations.ApiModelProperty;
public class User {
    @ApiModelProperty(value = "用戶id")
    private String userId;
    @ApiModelProperty(value = "用戶名稱")
    private String name;
    /**
     * 狀態(tài)參考 UserStatus
     */
    @ApiModelProperty(value = "用戶狀態(tài)  1已認(rèn)證，2 認(rèn)證中，3未通過認(rèn)證，7未提交認(rèn)證")
    private Integer status;
    @ApiModelProperty(value = "頭像地址")
    private String headPicFileName;
    @ApiModelProperty(value = "手機(jī)號(hào)")
    private String telephone;
    /**
     * 用戶級(jí)別 0到期 1游客 2臨時(shí)用戶 3認(rèn)證用戶 參考health com.dachen.health.commons.vo.User
     */
    private Integer userLevel;
    @ApiModelProperty(value = "醫(yī)生信息")
    private Doctor doctor;
    get/setXxx().... 
    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        User user = (User) o;
        return userId != null ? userId.equals(user.userId) : user.userId == null;
    }
}

但是前端頁面需要展示更多個(gè)關(guān)于用戶的消息，如用戶的角色Role,而User實(shí)體類中的信息不全，為了返回更多的信息，

有兩種做法：

1.直接在user類中添加需要的信息屬性
2.創(chuàng)建一個(gè)新類UserVO extends User，只在UserVO中添加更多屬性，而且以VO結(jié)尾表示用于返回前端的數(shù)據(jù)

如果采用第一種做法，User類可能會(huì)越來越大，也不方便后期維護(hù)，而且User類作為對(duì)數(shù)據(jù)庫表的映射，添加冗余的屬性反而會(huì)破壞這種映射關(guān)系，采取第二種方法，更加清晰明確.

現(xiàn)在采用第二種方法，假設(shè)從數(shù)據(jù)中查出user列表：

List<User> users = userServiceImpl.findUsersByIds(userIds);
//將User列表轉(zhuǎn)換為UserVO列表:
List<CircleUserVO> circleUserVOs=BeanUtil.copyList(users,CircleUserVO.class);
//給UserVO添加角色屬性
wrapRole(circleUserVOs,circleId);
wrapRole(List<CircleUserVO> circleUserVOs,Long circleId){
    //所有角色權(quán)限
    List<CircleUserVO> circleUserVOList = circleMemberRoleMapper.selectAllMemberRoleByCircleId(circleId);
    for (CircleUserVO circleUserVO:circleUserVOList){
        for (CircleUserVO circleUserVO1:circleUserVOs){
            if(circleUserVO.getUserId().equals(circleUserVO1.getUserId())){
                circleUserVO1.setRole(circleUserVO.getRole());
            }
        }
    }
}

package com.dachen.circle.model.vo;
import com.dachen.circle.model.inner.User;
import io.swagger.annotations.ApiModelProperty;
public class CircleUserVO extends User{
    @ApiModelProperty(value = "在該圈子的角色1：管理員 2：圈主（負(fù)責(zé)人）3：顧問 逗號(hào)拼接 多個(gè)角色 可同時(shí)為管理員，圈主，顧問")
    private String role;
    @ApiModelProperty(value = "0否 1是 永久免費(fèi)")
    private Integer permanentFree;
    @ApiModelProperty(value = "1正常 2欠費(fèi)")
    private Integer arrearageStatus;
    @ApiModelProperty(value = "過期時(shí)間 月數(shù)")
    private Integer expirationMonth;
    @ApiModelProperty(value = "醫(yī)院名稱")
    private String hospital;
    @ApiModelProperty(value = "科室")
    private String departments;
    @ApiModelProperty(value = "職稱")
    private String title;
    @ApiModelProperty(value = "簡介")
    private String introduction;
    @ApiModelProperty(value = "排序字母 A-Z Z1為#")
    private String letter;
   get/setXxx(); 
}

package com.dachen.util;
import org.springframework.beans.BeanUtils;
import java.util.ArrayList;
import java.util.List;
public class BeanUtil {
     public static <T> T copy(Object poObj,final Class <T>voClass)
     {
         T voObj =null;
         try {
             voObj = voClass.newInstance();
             BeanUtils.copyProperties(poObj, voObj);
             return voObj;
         } catch (InstantiationException | IllegalAccessException e) {
             e.printStackTrace();
         }
         return null;
     }
     public static <T> List <T> copyList(List <? extends Object> poList ,final Class <T>voClass){
        List<T> voList=new ArrayList<T>();
        T voObj =null;
        for(Object poObj:poList){
            try {
                voObj = voClass.newInstance();
                BeanUtils.copyProperties(poObj, voObj);
                voList.add(voObj);
            } catch (InstantiationException | IllegalAccessException e) {
                e.printStackTrace();
            }
            System.out.println(voObj);
        }
        return voList;
    }
}