数字字典的查询数组导出和数据导入

Posted 2022-10-31 金石不渝

数字字典的查询、数组导出和数据导入核心代码笔记

1、开始对mapper层的编写

public interface  DictMapper  extends BaseMapper<Dict> 

2、对service层接口编写

public interface DictService extends IService<Dict> 
    //根据数据id查询子数据列表
    List<Dict> findChlidData(Long id);

    //导出数字字典
    void exportData(HttpServletResponse response);

    //导入数据字典
    public void importData(MultipartFile file);

3、接口的实现代码

@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService 

    //根据数据id查询子数据列表
    @Override
    @Cacheable(value = "dict",keyGenerator = "keyGenerator")
    public List<Dict> findChlidData(Long id) 
        QueryWrapper<Dict> wrapper = new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        List<Dict> dictList = baseMapper.selectList(wrapper);
        for (Dict dict: dictList)
            Long dictId = dict.getId();
            boolean isChild = this.isChildren(dictId);
            dict.setHasChildren(isChild);
        
        return dictList;
    
    //导出数据字典接口
    @Override

    public void exportData(HttpServletResponse response) 
        //设置下载信息
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String fileName = "dict";
        response.setHeader("Content-disposition", "attachment;filename="+ fileName + ".xlsx");
        //查询数据库
        List<Dict> dictList = baseMapper.selectList(null);
        //Dict -- DictEeVo    集合转化为队列
        List<DictEeVo> dictVoList = new ArrayList<>();
        for(Dict dict:dictList) 
            DictEeVo dictEeVo = new DictEeVo();
            // dictEeVo.setId(dict.getId());
            BeanUtils.copyProperties(dict,dictEeVo);
            dictVoList.add(dictEeVo);
        
        //调用方法进行写操作
        try 
            EasyExcel.write(response.getOutputStream(), DictEeVo.class).sheet("dict")
                    .doWrite(dictVoList);
         catch (IOException e) 
            e.printStackTrace();
        
    
    //导出数字字典
    @Override
    @CacheEvict(value = "dict", allEntries=true)
    public void importData(MultipartFile file) 
        try 
            EasyExcel.read(file.getInputStream(),DictEeVo.class,new DictListener(baseMapper)).sheet().doRead();
         catch (IOException e) 
            e.printStackTrace();
        

    


    //判断id下面是否有子节点
    private boolean isChildren(Long id) 
        QueryWrapper<Dict> wrapper = new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        Integer count = baseMapper.selectCount(wrapper);
        // 0>0    1>0
        return count>0;
    

Controller

@Api(description = "数据字典接口")
@RestController
@RequestMapping("/admin/cmn/dict")
@CrossOrigin
public class DictController 

    @Autowired
    private DictService dictService;

    @ApiOperation(value = "导入")
//    数字导入
    @PostMapping("importData")
    public Result importData(MultipartFile file) 
        dictService.importData(file);
        return Result.ok();
    

//
    @ApiOperation(value="导出")
    @GetMapping(value = "/exportData")
    public void exportData(HttpServletResponse response) 
        dictService.exportData(response);
    


    //根据数据id查询子数据列表
    @ApiOperation(value = "根据数据id查询子数据列表")
    @GetMapping("findChildData/id")
    public Result findChildData(@PathVariable Long id) 
        List<Dict> list = dictService.findChlidData(id);
        return Result.ok(list);