读写Excel基本代码

直接复制不一定能用

实体类

@ExcelIgnore 在导出操作中不会被导出

@ExcelProperty 在导入过程中可以根据导入模板自动匹配字段，在导出过程中可用于设置导出的标题名字


@Getter
@Setter
public class Material{
    @ExcelIgnore
    private Long id;

    /** 所属部门 */
    @ExcelProperty(value = {"一级合并标题","所属部门"})
    private String department;

    /** 所属部室/项目部/站区 */
    @ExcelProperty(value = {"一级合并标题","所属部室/项目部/站区"})
    private String area;
}

监听类

监听类控制导入数据的规则限制，监听类继承`AnalysisEventListener<Object>`类实现接口。

监听中无法调用Spring接口，使用反序列化注入Bean工厂中使用

public class MaterialListener extends AnalysisEventListener<Material> {
    // 反序列化注入bean工厂
    ISysDictDataService dictDataService = SpringUtils.getBean(ISysDictDataService.class);
    //可以通过实例获取该值
    private List<Material> datas = new ArrayList<>();
    //错误信息
    private List<String> errorInfo = new ArrayList<>();
    @Override
    public void invoke(Material material, AnalysisContext analysisContext) {
        doSomething(material,analysisContext);//根据自己业务做处理

        datas.add(material);//数据存储到list，供批量处理，或后续自己业务逻辑处理。
    }
    private void doSomething(Material object, AnalysisContext analysisContext) {
        //获取当前行数
        Integer row = analysisContext.readRowHolder().getRowIndex();
        SysDictData sysDictData=new SysDictData();
        if (ObjectUtils.isBlank(object.getType())){
            errorInfo.add(" 第" + (row+1) + "行：物资种类不能为空，请重新填写后再导入!<br>");
        }else {
            sysDictData.setDictType("material_type");
            sysDictData.setDictLabel(object.getType());
            List<SysDictData> list3= dictDataService.selectDictDataList(sysDictData);
            if (ObjectUtils.isBlank(list3)){
                errorInfo.add(" 第" + (row+1) + "行：物资种类:"+object.getType()+"未在数据字典中找到，请先填写后再导入!<br>");
            }
        }
    }
    //返回结果集对象
    public List<Material> getDatas() {
        return datas;
    }

    public void setDatas(List<Material> datas) {
        this.datas = datas;
    }

    //返回错误消息
    public List<String> getErrorInfo() {
        return errorInfo;
    }

    public void setErrorInfo(List<String> errorInfo) {
        this.errorInfo = errorInfo;
    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}

控制器

导入数据方法

在`materialService.saveList(materialList)`中进行处理导入获取过来的数据，用于存取业务数据

    @PostMapping("/importData")
    @ResponseBody
    public AjaxResult  importData(@RequestParam MultipartFile file) throws Exception
    {
        MaterialListener excelListener = new MaterialListener();
        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 文件流会自动关闭
        //EasyExcel.read(哪个文件).sheet(那张sheet表).head(表头什么样子).headRowNumber(表头占几行).registerReadListener(处理数据的监听器类).doRead()
        EasyExcel.read(file.getInputStream(), Material.class, excelListener).sheet().head(Material.class).headRowNumber(2).doRead();
        if(ObjectUtils.isBlank(excelListener.getErrorInfo())){
            if(ObjectUtils.isNotBlank(excelListener.getDatas())){
                List<Material> materialList = excelListener.getDatas();
                materialService.saveList(materialList);
            }
            return AjaxResult.success(1);
        }else{
            return AjaxResult.error("操作失败",excelListener.getErrorInfo());
        }
    }

导出数据方法

单sheet导出在注释的方法出，多sheet导出如下所示

 @GetMapping("/exportData")
    public void exportData(Material material, HttpServletResponse response){
        //换方法连表查询
//        List<Material> list = materialService.selectMaterialListByDict(material);
        List<Material> materialList=new ArrayList<>();
        List<Material> list = materialService.selectMaterialList(material);
        String[] ids=new String[list.size()];
        for (Material p:list) {
		//用于修改导出的数据
            String list7= dictDataService.selectDictLabel("material_type",p.getType());
            if (ObjectUtils.isNotBlank(list7)){
                p.setType(list7);
            }
            materialList.add(p);
        }
        List<MaterialSolid> materialSolidList=new ArrayList<>();
        List<MaterialSolid> materialSolidListS = materialSolidService.selectMaterialSolidListByIds(ids);
        for (MaterialSolid solid:materialSolidListS) {
            String list7= dictDataService.selectDictLabel("material_type",solid.getType());
            if (ObjectUtils.isNotBlank(list7)){
                solid.setType(list7);
            }
            materialSolidList.add(solid);
        }
        try {
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf-8");
            // 这里URLEncoder.encode可以防止中文乱码 当然和EASYEXCEL没有关系
            String fileName = URLEncoder.encode("物料信息台账", "UTF-8");
            response.setHeader("Content-disposition", "attachment;filename="+ fileName + ".xlsx");
            //调用方法进行写的操作
//            EasyExcel.write(response.getOutputStream(),Material.class).sheet("物料信息台账").doWrite(materialList);
            //多sheet页导出
            ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
            WriteSheet writeSheet1 = EasyExcel.writerSheet(0, "物料信息总账").head(Material.class).build();
            WriteSheet writeSheet2 = EasyExcel.writerSheet(1, "物料信息详情").head(MaterialSolid.class).build();
            excelWriter.write(materialList, writeSheet1);
            excelWriter.write(materialSolidList, writeSheet2);
            excelWriter.finish();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }