springMVC+easypoi做excel的導入導出

1.認識

Java操作辦公軟件：jxl、poi

數據讀取用POI，只要不涉及單元格樣式的寫入使用jxl效率高點。POI讀取效率高，但是大數據量寫入Excel效率比jxl慢。

jxl只使用03版本、po使用所有版本

2.easypoi需要導入的jar包

<dependency>
      <groupId>cn.afterturn</groupId>
      <artifactId>easypoi-base</artifactId>
      <version>3.2.0</version>
    </dependency>
    <dependency>
      <groupId>cn.afterturn</groupId>
      <artifactId>easypoi-web</artifactId>
      <version>3.2.0</version>
    </dependency>
    <dependency>
      <groupId>cn.afterturn</groupId>
      <artifactId>easypoi-annotation</artifactId>
      <version>3.2.0</version>
    </dependency>

 <!-- JSR 303 規范驗證包 Excel驗證-->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>5.2.4.Final</version>
    </dependency>

 

3.在需要操作的實體類進行配置注解

@Excel注解為需要導入或是導出的數據、name為表頭、

注意：type=2表示為圖片、format可以設置日期格式

public class Employee extends BaseDomain{
    @Excel(name = "用戶名")
    @NotNull(message = "用戶名不能為空")
    private String username;
    private String password;
    @Excel(name = "郵箱",width = 20)
    private String email;
    @Excel(name = "年齡")
    @Max(value = 60,message = "年齡不能大於60")
    @Min(value = 18,message = "年齡不能小於18")
    private Integer age;
    @Excel(name = "頭像",type = 2,height = 30)
    private String headImage;

4.在applicationContex中配置view

<!--Excel導出的視圖解析器-->
    <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" p:order="0"></bean>
    <!--掃描Excel的view-->
    <context:component-scan base-package="cn.afterturn.easypoi.view"/>

5.導出

public String exportExcel(ModelMap map, SystemlogQuery query){
        //拿到數據
        List<Systemlog> list = systemlogService.findAll();
        ExportParams params = new ExportParams("日志數據", "日志表", ExcelType.XSSF);
//        params.setFreezeCol(5); //凍結  那條綠線
        map.put(NormalExcelConstants.DATA_LIST, list); // 數據集合
        map.put(NormalExcelConstants.CLASS, Systemlog.class);//導出實體
        map.put(NormalExcelConstants.PARAMS, params);//參數
        map.put(NormalExcelConstants.FILE_NAME, "日志信息");//文件名稱
        return  NormalExcelConstants.EASYPOI_EXCEL_VIEW;//需要配置新的視圖解析器並設置優先級和掃描
    }

6.導入

 //empFile名字與前台一致
    public String importXlsx(MultipartFile empFile,HttpServletResponse response) throws Exception{
        //獲取參數
        ImportParams params = new ImportParams();
        params.setHeadRows(1); //不要這行
        //驗證開啟
        params.setNeedVerfiy(true);
        //自定義驗證
        params.setVerifyHandler(employeeExcelVerifyHandler);
        //導入參數
        /*List<Employee> list = ExcelImportUtil.importExcel(
                empFile.getInputStream(),
                Employee.class, params);*/
        ExcelImportResult<Employee> result = ExcelImportUtil.importExcelMore(
                empFile.getInputStream(),
                Employee.class, params);

        //獲取正確導入的集合
        List<Employee> list = result.getList();
        for (Employee employee : list) {
            employee.setPassword("123"); //默認密碼123
            if(employee.getDepartment()!=null) {
                //設置部門
                Department department = departmentService.findByName(employee.getDepartment().getName());
                employee.setDepartment(department);
            }

            employeeService.save(employee);
        }
        //如果導入失敗
        if(result.isVerfiyFail()){
            //獲取導入失敗的員工的Excel
            Workbook failWorkbook = result.getFailWorkbook();
            //導出Excel表
            //獲取輸出流
            ServletOutputStream fos = response.getOutputStream();
            //響應類型
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); //mime類型
            //告訴瀏覽器這是下載
            response.setHeader("Content-disposition", "attachment;filename=errorx.xlsx");
            //不要緩存
            response.setHeader("Pragma", "No-cache");
            failWorkbook.write(fos);
            fos.flush();
            fos.close();
        }
        return "import";
    }