SpringBoot中Bean拷贝及工具类封装的实现

BeanUtils.copyProperties(Object source, Object target);

BeanUtils.copyProperties(Object source, Object target, String... ignoreProperties);

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;
    private String username;
    private Integer age;
    private Date createTime;
    private Date updateTime;
    private Integer deleted;
}

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class AddUserDto {
    private String username;
    private Integer age;
}

public ResponseResult addUser(AddUserDto addUserDto) {
    // 先新建一个user对象
    User user = new User();
    // 实现把addUserDto拷贝到user对象
    BeanUtils.copyProperties(addUserDto, user);
    userMapper.insert(user);
    return ResponseResult.okResult();
}

import org.springframework.beans.BeanUtils;
import java.util.List;
import java.util.stream.Collectors;
public class BeanCopyUtils {
    private BeanCopyUtils() {
    }
    public static <V> V copyBean(Object source, Class<V> clazz) {
        // 创建目标对象
        V result = null;
        try {
            result = clazz.newInstance();
            // 实现属性拷贝
            BeanUtils.copyProperties(source, result);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //返回
        return result;
    }
    public static <O, V> List<V> copyBeanList(List<O> list, Class<V> clazz) {
        return list.stream()
                .map(o -> copyBean(o, clazz))
                .collect(Collectors.toList());
    }
}

public ResponseResult addUser(AddUserDto addUserDto) {
    User user = BeanCopyUtils.copyBean(addUserDto, User.class);
    userMapper.insert(user);
    return ResponseResult.okResult();
}

public ResponseResult getUser(Integer pageNum, Integer pageSize) {
    Page<User> userPage = new Page<>(pageNum, pageSize);
    userMapper.selectPage(userPage, null);
    List<UserVo> userVos = BeanCopyUtils.copyBeanList(userPage.getRecords(), UserVo.class);
    PageVo pageVo = new PageVo(userVos, userPage.getTotal());
    return ResponseResult.okResult(pageVo);
}