Java中EasyPoi多sheet导出功能实现

<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>

@ExcelTarget("deptUtil")
public class DeptUtil {

  @Excel(name = "部门编号", width = 30 , needMerge = true)
  private Integer id;

  @Excel(name = "部门名称", width = 30 , needMerge = true)
  private String deptName;

  @ExcelCollection(name = "员工信息")
  private List<EmpUtil> emps;


	....省略getter、setter方法

@ExcelTarget("empUtil")
public class EmpUtil{

  @Excel(name = "序号", width = 30, isColumnHidden = true)
  private Integer id;

  @Excel(name = "员工姓名", width = 30, groupName = "基本信息")
  private String empName;

  @Excel(name = "年龄", width = 30, type = 10, groupName = "基本信息")
  private Integer age;

  @Excel(name = "入职时间", width = 30, groupName = "工作信息", format = "yyyy/MM/dd HH:mm")
  private Date hiredate;

  @Excel(name = "薪酬", width = 30, type = 10, groupName = "工作信息")
  private BigDecimal salary;


	....省略getter、setter方法

public String export(){

    Workbook workBook = null;
    try {
      List<DeptUtil> exportList = exportService.exportList();
      System.err.println(JSONArray.toJSONString(exportList));

      // 创建参数对象（用来设定excel得sheet得内容等信息）
      ExportParams deptExportParams = new ExportParams();
      // 设置sheet得名称
      deptExportParams.setSheetName("员工报表1");
      // 创建sheet1使用得map
      Map<String, Object> deptExportMap = new HashMap<>();
      // title的参数为ExportParams类型，目前仅仅在ExportParams中设置了sheetName
      deptExportMap.put("title", deptExportParams);
      // 模版导出对应得实体类型
      deptExportMap.put("entity", DeptUtil.class);
      // sheet中要填充得数据
      deptExportMap.put("data", exportList);

      ExportParams empExportParams = new ExportParams();
      empExportParams.setSheetName("员工报表2");
      // 创建sheet2使用得map
      Map<String, Object> empExportMap = new HashMap<>();
      empExportMap.put("title", empExportParams);
      empExportMap.put("entity", DeptUtil.class);
      empExportMap.put("data", exportList);

      // 将sheet1、sheet2、sheet3使用得map进行包装
      List<Map<String, Object>> sheetsList = new ArrayList<>();
      sheetsList.add(deptExportMap);
      sheetsList.add(empExportMap);
      // 执行方法
      workBook = ExcelExportUtil.exportExcel(sheetsList, ExcelType.HSSF);
      fileName = URLEncoder.encode("员工报表导出", "UTF-8");
      ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
      workBook.write(outputStream);
      outputStream.flush();
      byte[] byteArray = outputStream.toByteArray();
      excelStream = new ByteArrayInputStream(byteArray,0,byteArray.length);
      outputStream.close();

    }catch (Exception e){
      e.printStackTrace();
    }finally {
      if(workBook != null) {
        try {
          workBook.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
    return "success";
  }