【后端架构完善与接口开发】005-封装返回值

约定不等于承诺〃 2023-10-03 13:03 2阅读 0赞

### 文章目录 ###

*   *  7、封装返回值
     *   *  第一步：新建 EbookResp
         *  第二步：修改 EbookService
         *  第三步：修改 EBookController
         *  第四步：运行测试

## 7、封装返回值 ##

> 数据库里面存储的字段并不都返回给前端！

### 第一步：新建 EbookResp ###

package com.zibo.wiki.resp;
    
    public class EbookResp {
        
        private Long id;
    
        private String name;
    
        private Long category1Id;
    
        private Long category2Id;
    
        private String description;
    
        private String cover;
    
        private Integer docCount;
    
        private Integer viewCount;
    
        private Integer voteCount;
    
        public Long getId() {
        
            return id;
        }
    
        public void setId(Long id) {
        
            this.id = id;
        }
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public Long getCategory1Id() {
        
            return category1Id;
        }
    
        public void setCategory1Id(Long category1Id) {
        
            this.category1Id = category1Id;
        }
    
        public Long getCategory2Id() {
        
            return category2Id;
        }
    
        public void setCategory2Id(Long category2Id) {
        
            this.category2Id = category2Id;
        }
    
        public String getDescription() {
        
            return description;
        }
    
        public void setDescription(String description) {
        
            this.description = description;
        }
    
        public String getCover() {
        
            return cover;
        }
    
        public void setCover(String cover) {
        
            this.cover = cover;
        }
    
        public Integer getDocCount() {
        
            return docCount;
        }
    
        public void setDocCount(Integer docCount) {
        
            this.docCount = docCount;
        }
    
        public Integer getViewCount() {
        
            return viewCount;
        }
    
        public void setViewCount(Integer viewCount) {
        
            this.viewCount = viewCount;
        }
    
        public Integer getVoteCount() {
        
            return voteCount;
        }
    
        public void setVoteCount(Integer voteCount) {
        
            this.voteCount = voteCount;
        }
    
        @Override
        public String toString() {
        
            StringBuilder sb = new StringBuilder();
            sb.append(getClass().getSimpleName());
            sb.append(" [");
            sb.append("Hash = ").append(hashCode());
            sb.append(", id=").append(id);
            sb.append(", name=").append(name);
            sb.append(", category1Id=").append(category1Id);
            sb.append(", category2Id=").append(category2Id);
            sb.append(", description=").append(description);
            sb.append(", cover=").append(cover);
            sb.append(", docCount=").append(docCount);
            sb.append(", viewCount=").append(viewCount);
            sb.append(", voteCount=").append(voteCount);
            sb.append("]");
            return sb.toString();
        }
    }

### 第二步：修改 EbookService ###

package com.zibo.wiki.serivce;
    
    import com.zibo.wiki.domain.Ebook;
    import com.zibo.wiki.domain.EbookExample;
    import com.zibo.wiki.mapper.EbookMapper;
    import com.zibo.wiki.req.EbookReq;
    import com.zibo.wiki.resp.EbookResp;
    import org.springframework.beans.BeanUtils;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.util.ArrayList;
    import java.util.List;
    
    @Service
    public class EBookService {
        
    
        @Autowired
        private EbookMapper ebookMapper;
    
        public List<EbookResp> list(EbookReq req){
        
            EbookExample ebookExample = new EbookExample();
            // 查询条件
            EbookExample.Criteria criteria = ebookExample.createCriteria();
            criteria.andNameLike("%" + req.getName() + "%");
            List<Ebook> ebookList = ebookMapper.selectByExample(ebookExample);
            List<EbookResp> respList = new ArrayList<>();
            for (Ebook ebook : ebookList) {
        
                EbookResp ebookResp = new EbookResp();
                BeanUtils.copyProperties(ebook,ebookResp); // 拷贝
                respList.add(ebookResp);
            }
            return respList;
        }
    
    }

### 第三步：修改 EBookController ###

package com.zibo.wiki.controller;
    
    import com.zibo.wiki.req.EbookReq;
    import com.zibo.wiki.resp.CommonResp;
    import com.zibo.wiki.resp.EbookResp;
    import com.zibo.wiki.serivce.EBookService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    @RestController
    public class EBookController {
        
    
        @Autowired
        private EBookService eBookService;
    
        @GetMapping("ebook/list")
        public CommonResp<List<EbookResp>> list(EbookReq req) {
        
            CommonResp<List<EbookResp>> resp = new CommonResp<>();
            List<EbookResp> list = eBookService.list(req);
            resp.setContent(list);
            return resp;
        }
    }

### 第四步：运行测试 ###

![image-20210718223326013][]

[image-20210718223326013]: https://img-blog.csdnimg.cn/img_convert/cc3198d75f26be4aec77b438e13ca3c3.png