POI上传excel的java后台逻辑

版权声明：著作权归作者所有，未经作者同意不得转载。 https://blog.csdn.net/qq_33417321/article/details/88947968

先导入依赖

<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
</dependency>
<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-scratchpad</artifactId>
</dependency>
<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
</dependency>

1、抽象类，把公共的方法抽出来

public abstract class AbstractExcelImportController {
    public AbstractExcelImportController() {
    }

    public abstract SheetConfig getSheetConfig();

    @RequestMapping({"showImportExcelDlg.do"})
    public String showImportExcelDlg(Model model) {
        Map<String, Object> result = new HashMap();
        result.put("urlprofix", this.getUrlProfix());
        model.addAttribute(UIConst.UIPAGEMODEL, result);
        return "platform/excelimport/excelimport.ui";
    }

    public abstract String getUrlProfix();

    @RequestMapping({"importExcel.do"})
    public String importExcel(MultipartFile excelimport_importfile, String overrideFlat, Model model, HttpServletRequest request) throws Exception {
        String errorMessage = null;
        if (excelimport_importfile != null && !excelimport_importfile.isEmpty() && excelimport_importfile.getSize() != 0L) {
            if (!excelimport_importfile.getOriginalFilename().endsWith("xls")) {
                errorMessage = "上传文件必须是以xls为后缀";
            } else {
                ExcelImporter importer = ExcelImporter.newInstance(this.getSheetConfig());

                try {
                    List<Map<String, Object>> datas = importer.readExcel(excelimport_importfile.getInputStream());
                    this.handleExcelData(datas, overrideFlat);
                } catch (BusinessException var8) {
                    var8.printStackTrace();
                    errorMessage = var8.getMessage();
                } catch (Exception var9) {
                    errorMessage = var9.getMessage();
                }
            }
        } else {
            errorMessage = "上传文件不能为空";
        }

        Map<String, Object> result = new HashMap();
        if (errorMessage != null) {
            result.put("success", false);
            result.put("errorMessage", errorMessage);
        } else {
            result.put("success", true);
        }

        model.addAttribute("result", CustomObjectMapper.getInstance().writeValueAsString(result));
        return "platform/excelimport/importresult";
    }

    protected abstract void handleExcelData(List<Map<String, Object>> var1, String var2) throws BusinessException;

    @RequestMapping({"downloadExcelTemplate.do"})
    public void downloadExcelTemplate(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ExcelExporter exporter = ExcelExporter.newInstance(this.getSheetConfig());
        OutputStream out = response.getOutputStream();
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment;filename=" + new String(this.getExcelTemplateFileName().getBytes("gb2312"), "ISO8859-1"));
        List<Map<String, Object>> datas = new ArrayList();
        exporter.writeExcel(datas, out);
    }

    public abstract String getExcelTemplateFileName();
}

2、每一个需要上传excel的web层(Controller)继承上边的接口，实现自己的上传业务逻辑

public class DeptController extends AbstractExcelImportController {
 /**
     * add by sgw 20190325
     *excel模板
     * @return  返回excel模板
     */
    @Override
    public SheetConfig getSheetConfig() {
        SheetConfig sheetConfig = new SheetConfig();
        List<SheetConfig.ColumnDef> columnDefList = new ArrayList<SheetConfig.ColumnDef>();
        SheetConfig.ColumnDef columnDef = null;

        columnDef = new SheetConfig.ColumnDef();
        columnDef.setTitle("部门编码");
        columnDef.setName("fdeptCode");
        columnDef.setComment("必填项!");
        columnDef.setWidth(30);
        columnDef.setColumnType(SheetConfig.ColumnDef.ColumnType.CODE);
        columnDefList.add(columnDef);

        columnDef = new SheetConfig.ColumnDef();
        columnDef.setTitle("部门名称");
        columnDef.setName("fdeptName");
        columnDef.setComment("必填项!");
        columnDef.setWidth(30);
        columnDef.setColumnType(SheetConfig.ColumnDef.ColumnType.STRING);
        columnDefList.add(columnDef);

        columnDef = new SheetConfig.ColumnDef();
        columnDef.setTitle("联系人");
        columnDef.setName("flinkMan");
        columnDef.setWidth(30);
        columnDef.setColumnType(SheetConfig.ColumnDef.ColumnType.STRING);
        columnDefList.add(columnDef);

        columnDef = new SheetConfig.ColumnDef();
        columnDef.setTitle("联系电话");
        columnDef.setName("flinkTel");
        columnDef.setWidth(50);
        columnDef.setColumnType(SheetConfig.ColumnDef.ColumnType.STRING);
        columnDefList.add(columnDef);

        columnDef = new SheetConfig.ColumnDef();
        columnDef.setTitle("联系地址");
        columnDef.setName("faddr");

        columnDef.setWidth(50);
        columnDef.setColumnType(SheetConfig.ColumnDef.ColumnType.STRING);
        columnDefList.add(columnDef);

        columnDef = new SheetConfig.ColumnDef();
        columnDef.setTitle("是否启用");
        columnDef.setName("fisEnable");
        columnDef.setComment("必填项!");
        columnDef.setWidth(20);
        columnDef.setColumnType(SheetConfig.ColumnDef.ColumnType.STRING);
        columnDefList.add(columnDef);

        sheetConfig.setColumnDefList(columnDefList);
        return sheetConfig;
    }

    /**
     * add by sgw 20190325
     * 告诉前端公用的excelImport.js，处理上传excel的controller路径
     * @return  处理excel的java类
     */

    @Override
    public String getUrlProfix() {
        return "basicinfo/standard/dept";
    }

    /**
     * add by sgw 20190325
     * 批量上传部门excel
     * @param datas        excel数据
     * @param overrideFlat 是否更新(覆盖)导入  "true":是
     * @throws BusinessException
     */
    @Override
    protected void handleExcelData(List<Map<String, Object>> datas, String overrideFlat) throws BusinessException {
        User user = (User) AppContext.getContext().getAttribute(
                AppContext.SESSION, "user");
        //1、更新(覆盖)导入：已存在部门编码时，将该部门编码下的部门信息进行更新(即无法更新部门编码，只能更新已有部门编码下的其他信息)
        if (overrideFlat != null && "true".equals(overrideFlat)) {
            //1.1、校验excel数据是否有误；如果传过来的部门编码在数据库里已经存在的了，则删除数据库里对应的数据
            boolean isCorrectDates = this.deptService.checkExcelDates(datas, overrideFlat, user,"update");
            //1.2、将新的部门数据插入到数据库里
            if (isCorrectDates) {
                //2.2、数据无误，将excel的数据循环导入到数据库
                for (Map<String, Object> map : datas) {
                    Dept dept = new Dept();
                    dept.setFdeptCode(map.get("fdeptCode").toString());
                    dept.setFdeptName(map.get("fdeptName").toString());
                    if (map.get("flinkMan") != null) {
                        dept.setFlinkMan(map.get("flinkMan").toString());
                    }
                    if (map.get("flinkTel") != null) {
                        dept.setFlinkTel(map.get("flinkTel").toString());
                    }
                    if (map.get("faddr") != null) {
                        dept.setFaddr(map.get("faddr").toString());
                    }
                    if (map.get("fisEnable") != null) {
                        if ("是".equals(map.get("fisEnable").toString())) {
                            dept.setFisEnable(1);
                        } else {
                            dept.setFisEnable(0);
                        }
                    }
                    this.deptService.doInsert(dept, user.getId());
                }
            }
        }
        //2、新增导入：已存在部门编码时，强制要求修改部门编码后再进行上传
        else {
            //2.1、校验excel数据是否有误
            boolean isCorrectDates = this.deptService.checkExcelDates(datas, overrideFlat, user,"add");
            if (isCorrectDates) {
                //2.2、数据无误，将excel的数据循环导入到数据库
                for (Map<String, Object> map : datas) {
                    Dept dept = new Dept();
                    dept.setFdeptCode(map.get("fdeptCode").toString());
                    dept.setFdeptName(map.get("fdeptName").toString());
                    if (map.get("flinkMan") != null) {
                        dept.setFlinkMan(map.get("flinkMan").toString());
                    }
                    if (map.get("flinkTel") != null) {
                        dept.setFlinkTel(map.get("flinkTel").toString());
                    }
                    if (map.get("faddr") != null) {
                        dept.setFaddr(map.get("faddr").toString());
                    }
                    if (map.get("fisEnable") != null) {
                        if ("是".equals(map.get("fisEnable").toString())) {
                            dept.setFisEnable(1);
                        } else {
                            dept.setFisEnable(0);
                        }
                    }
                    this.deptService.doInsert(dept, user.getId());
                }
            }
        }
    }

    /**
     * add by sgw 20190325
     * @return excel模板的文件名
     */
    @Override
    public String getExcelTemplateFileName() {
        return "主管部门信息.xls";
    }
}