Dozer使用

转载于：https://blog.csdn.net/baidu_37107022/article/details/89082576?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-2.control&dist_request_id=&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-2.control

Dozer依赖：

<!--类转换依赖-->
<dependency>
    <groupId>com.github.dozermapper</groupId>
    <artifactId>dozer-spring-boot-starter</artifactId>
    <version>6.2.0</version>
</dependency>

 实体类：

VO：

package com.baise.model;

import com.baise.bean.ArticleCategory;
import com.baise.bean.BaseBean;
import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import org.dozer.Mapping;

import java.util.Date;

/**
 * @author wjn
 * @version 1.0
 * @date 2021/4/15 16:24
 */
@Setter
@Getter
@JsonInclude(JsonInclude.Include.NON_NULL)
@AllArgsConstructor
@NoArgsConstructor
public class ArticlePageViewModel{

    private Long id;//文章id

    private String title;//文章标题

    private String keyword;//关键词

    private String describe;//描述

    private String content;//文章内容

    private String imgUrl;//缩略图

    private Integer type;//文章类别：1表示文章列表、2表示专题列表、3表示banana图

    private String author;//作者

    private Integer categoryId;//分类id

    @Mapping("articleCategory.articleCategoryName")
    private String articleCategoryName;//分类名称

    private Date createTime;//创建时间


}

Entity:

package com.baise.bean;

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.*;
import org.dozer.Mapping;

/**
 * @author wjn
 * @version 1.0
 * @date 2021/4/15 9:56
 */
@Setter
@Getter
@JsonInclude(JsonInclude.Include.NON_NULL)
@AllArgsConstructor
@NoArgsConstructor
public class Article extends BaseBean{

    private String title;//文章标题

    private String keyword;//关键词

    private String describe;//描述

    private Integer categoryId;//文章分类id

    private Integer state;//是否发布：true表示发布、false表示不发布

    private String content;//文章内容

    private String imgUrl;//缩略图

    private Integer type;//文章类别：1表示文章列表、2表示专题列表、3表示banana图

    private String author;//作者

    private ArticleCategory articleCategory;//文章分类id

    private Integer timeState;//1表示一天内、2表示一周内、3表示一月内、4表示一年内

}

mybatis查询语句：

<select id="selectArticleListPageView" resultType="com.baise.bean.Article">
        SELECT
            a.id AS "id",
            a.title AS "title",
            a.author AS "author",
            b.NAME AS "articleCategory.articleCategoryName",
            a.update_time AS "createTime",
            a.img_url AS "imgUrl",
            a.keyword AS "keyword",
            a.DESCRIBE AS "describe",
            a.type AS "type",
            a.content AS "content",
            b.id AS "categoryId"
        FROM
            article a
            INNER JOIN article_category b ON a.category_id = b.id
        WHERE
            a.not_delete = 1
            AND a.id = #{id}
            AND a.state =1
    </select>

Service层类转换代码：

@Override
    public PageModel selectAdminArticleList(Integer pageNum, Integer pageSize, Article article) {
        Page<AdminArticleListModel> pageInfo = PageHelper.startPage(pageNum, pageSize, true)
                .doSelectPage(() -> Dozer.convert(articleMapper.selectAdminArticleList(article),AdminArticleListModel.class));
        return new PageModel(pageInfo.getPages(), pageSize, pageInfo.getTotal(), pageInfo);
    }

 Dozer工具类：

package com.baise.utils;

/*import com.github.dozermapper.core.Mapper;*/
import org.dozer.Mapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.lang.NonNull;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 *
 * dozer转换类
 *
 *

 */
@Component
public class Dozer {

    /**
     * dozer转换的核心mapper对象
     */
    private static Mapper dozerMapper;

    @Autowired
    private Mapper mapper;

    @PostConstruct
    private void construct() {
        Dozer.setDozerMapper(mapper);
    }

    private static void setDozerMapper(Mapper dozerMapper) {
        Dozer.dozerMapper = dozerMapper;
    }

    /**
     * 转换实体为另一个指定的实体
     * 任意一个参数为NULL时 会抛出NPE
     * {@link }//com.github.dozermapper.core.util.MappingValidator#validateMappingRequest
     *
     * @param source 源实体 不能为NULL
     * @param clazz 目标实体 不能为NULL
     * @param <T> 泛型
     * @return 转换后的结果
     */
    @NonNull
    public static <T> T convert(@NonNull Object source, @NonNull Class<T> clazz) {
        return  dozerMapper.map(source, clazz);
    }

    /**
     * 转换List实体为另一个指定的实体
     * source如果为NULL 会使用空集合
     * 在目标实体为NULL时 会抛出NPE
     * {@link }//com.github.dozermapper.core.util.MappingValidator#validateMappingRequest
     *
     * @param source 源集合 可以为NULL
     * @param clazz 目标实体 不能为NULL
     * @param <T> 泛型
     * @return 转换后的结果
     */
    @Nullable
    public static <T> List<T> convert(@Nullable List<?> source, @NonNull Class<T> clazz) {
        return Optional.ofNullable(source)
                .orElse(Collections.emptyList())
                .stream()
                .map(bean -> dozerMapper.map(bean, clazz))
                .collect(Collectors.toList());
    }
}