Dozer使用
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());
}
}
