使用 easypoi 导出excel

1、使用注解导出excel

2、使用模板导出excel

　　 /**
     * @Description:
     * @param response
     * @param request
     * @param planTotalId
     * @param planTotalIdGroup
     * @param orgId
     * @author  houChen
     * @date  2020/5/4 17:27
     */
    @RequestMapping(value="exportexcel")
    @ResponseBody
    public void exportExcelTest(HttpServletResponse response,HttpServletRequest request,Long planTotalId,
                                Long planTotalIdGroup,Long orgId){
        Workbook workbook = fmexpenseplantotalService.constructWorkbook1(planTotalId,planTotalIdGroup,orgId);
        downLoadExcel("资金支出申报表.xlsx", response, workbook);
    }


　　//将workbook 写出到response流中
    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            e.getStackTrace();
        }
    }


/**
 * @Description:        使用 Easyiop 的模板方式导出 excel   (注释模板混用 ==》 合并单元格)
 * @param planTotalId
 * @param planTotalIdGroup
 * @param orgId
 * @author  houChen
 * @date  2020/4/30 15:43  注意：这是我自己构造的数据，你们要按照你们的实际需求来构造数据
 */
public Workbook constructWorkbook1(Long planTotalId, Long planTotalIdGroup, Long orgId) {
   TemplateExportParams params  = new TemplateExportParams("static/template/ExcelTemplate.xlsx");
   Map<String, Object> map  =  new HashMap<String, Object>();  //构造模板需要的相关信息

   // 查询导出的excel的表头和表尾信息
   Map<String, Object> p =  new HashMap<String, Object>();
   p.put("planTotalId", planTotalId);
   Map<String, Object> info = bSqlHelper.getMap("business.fm.FmExpensePlanTotal.getBaseInfo", p);
   map.put("month",Objects.toString(info.get("month"),""));
   map.put("orgName",Objects.toString(info.get("orgIdName"),""));
   map.put("yearC",Objects.toString(info.get("yearC"),""));
   map.put("monthC",Objects.toString(info.get("monthC"),""));
   map.put("dayC",Objects.toString(info.get("dayC"),""));
   map.put("createAccountText",Objects.toString(info.get("createAccountText"),""));
   map.put("businessDeptName", "");
   //获取事业部名称
   String org = Objects.toString(info.get("orgId"), "");
   if(!"".equals(org)){
      Long belongDept = basOrgService.findByOrgId(Long.parseLong(org)).getBelongDept();
      if(belongDept!=null){
         map.put("businessDeptName",basDeptService.findByDeptId(belongDept).getDeptName());
      }
   }
       // 汇总的审批意见
   Map<String, Map<String, Object>> formAdvices = flowUtilService.queryWorkMemory("FmExpensePlanTotal", Long.parseLong(Objects.toString(info.get("processinstid"))));
   map.put("deptOpinion", formAdvices.get("deptOpinion").get("accountName"));
   map.put("leader", formAdvices.get("leader").get("accountName"));

   List<ExcelEntity> result =new ArrayList<>();
   //1、构造日常支出费用的List
   // 获取 事业部资金计划汇总下的所有资金计划 +  资金计划关联的明细 (1、收支计划ID  2，收支计划名称  3、收支计划数量)
   Double totalMoneyForExpense =0d;//日常费用支出合计
   Double totalMoneyForProject =0d;//项目建设支出总的合计
   Long expenseEndRow = 0L;  // 日常收支计划 第二列合并结束的行数

   List<Map<String,Object>> statisticInfoByClassId = fmexpenseplandetailService.statisticByClassIdAndPlanTotalId(planTotalId);
   for(Map<String,Object> m:statisticInfoByClassId){
      String classId = Objects.toString(m.get("classId"), "");
      Double applyMoneyByclassid= Double.parseDouble(Objects.toString(m.get("applyMoneyByclassid"), "0"));
      totalMoneyForExpense += applyMoneyByclassid;

      //每个收支项目明细的个数
      String classNumStr = Objects.toString(m.get("classNum"), "0");
      long classNum = Long.parseLong(classNumStr);
      expenseEndRow+=(classNum+1);

      // 根据planTotalId 和 classId 获取资金收支计划的子表信息
      if(!"".equals(classId)){
         List<Map<String,Object>> detailList = fmexpenseplandetailService.findDetailListByPlanTotalId(planTotalId,Long.parseLong(classId));
         for(Map<String,Object> detail:detailList){
            ExcelEntity a =new ExcelEntity();
            a.setTopClass("日常支出费用");
            a.setSecClass(Objects.toString(m.get("className"),""));
            a.setSystemName(Objects.toString(detail.get("systemName"),""));
            a.setApplyMoney(Objects.toString(detail.get("applyMoney"),""));
            a.setDeptName(Objects.toString(detail.get("deptName"),""));
            a.setReceiveUnit("");
            a.setBudgetBase("");
            a.setRemark(Objects.toString(detail.get("remark"),""));
            result.add(a);
         }
         //每个收支分类的合计
         ExcelEntity heji =new ExcelEntity();
         heji.setTopClass("日常支出费用");
         heji.setSecClass(Objects.toString(m.get("className"),""));
         heji.setSystemName("合计");
         heji.setApplyMoney(applyMoneyByclassid.toString());
         heji.setDeptName("");
         heji.setReceiveUnit("");
         heji.setBudgetBase("");
         heji.setRemark("");
         result.add(heji);
      }
   }
   //日常收支费用的合计
   ExcelEntity heji1 =new ExcelEntity();
   heji1.setTopClass("日常支出费用");
   heji1.setSecClass("合计");
   heji1.setSystemName("合计");
   heji1.setApplyMoney(totalMoneyForExpense.toString());
   heji1.setDeptName("");
   heji1.setReceiveUnit("");
   heji1.setBudgetBase("");
   heji1.setRemark("");
   result.add(heji1);

   // 集团 资金收支计划汇总 统计月度资金计划的相关信息
   List<Map<String,Object>> statisticInfoByProjectId  = fmexpenseplandetailService.simple(planTotalIdGroup,orgId);
   if(statisticInfoByProjectId.size()!=0){
      for(Map<String,Object> m:statisticInfoByProjectId){
         String classId = Objects.toString(m.get("classId"), "");
         Double applyMoneyByclassid= Double.parseDouble(Objects.toString(m.get("applyMoneyByclassid"), "0"));
         totalMoneyForProject += applyMoneyByclassid;
         // 根据 集团汇总Id planTotalIdGroup 和 orgId 获取资金计划的子表信息
         if(!"".equals(classId)){
            List<Map<String,Object>> detailList = pmPayPlanService.findByplanTotalIdGroupAndOrgId(planTotalIdGroup,orgId,Long.parseLong(classId));
            for(Map<String,Object> detail:detailList){
               ExcelEntity a =new ExcelEntity();
               a.setTopClass("项目建设支出");
               a.setSecClass(Objects.toString(m.get("className"),""));
               a.setSystemName(Objects.toString(detail.get("systemName"),""));
               a.setApplyMoney(Objects.toString(detail.get("applyMoney"),""));
               a.setDeptName(Objects.toString(detail.get("deptName"),""));
               a.setReceiveUnit("");
               a.setBudgetBase("");
               a.setRemark(Objects.toString(detail.get("remark"),""));
               result.add(a);
            }
            //每个收支分类的合计
            ExcelEntity heji =new ExcelEntity();
            heji.setTopClass("项目建设支出");
            heji.setSecClass(Objects.toString(m.get("className"),""));
            heji.setSystemName("合计");
            heji.setApplyMoney(applyMoneyByclassid.toString());
            heji.setDeptName("");
            heji.setReceiveUnit("");
            heji.setBudgetBase("");
            heji.setRemark("");
            result.add(heji);
         }
      }
      ExcelEntity heji2 =new ExcelEntity();
      heji2.setTopClass("项目建设支出");
      heji2.setSecClass("合计");
      heji2.setSystemName("合计");
      heji2.setApplyMoney(totalMoneyForProject.toString());
      heji2.setDeptName("");
      heji2.setReceiveUnit("");
      heji2.setBudgetBase("");
      heji2.setRemark("");
      result.add(heji2);
   }
   map.put("list", result);
   //日常费用支出 + 项目建设支出总费用
   Double totol = totalMoneyForProject+totalMoneyForExpense;
   map.put("totol", totol.toString());

   Workbook workbook = ExcelExportUtil.exportExcel(params , map);
   Sheet sheetAt = workbook.getSheetAt(0);
   //合并第一列
   Map<Integer, int[]> mergeMap =new HashMap<>();
   mergeMap.put(0, null);
   // Map<Integer, int[]>  mergeMap  ===>  key--列,value--依赖的列,没有传空
       PoiMergeCellUtil.mergeCells(sheetAt, mergeMap, 3,sheetAt.getLastRowNum()-2);

   //合并第二列
   // 1、日常收支费用的合并
   Map<Integer, int[]> mergeMap1 =new HashMap<>();
   mergeMap1.put(1,null);
   int endRow = expenseEndRow.intValue()+3-1;
   PoiMergeCellUtil.mergeCells(sheetAt, mergeMap1, 3,endRow);
   //合并日常收支费用的合计
   CellRangeAddress region1 = new CellRangeAddress(endRow+1, endRow+1, (short) 1, (short) 2); //参数1：起始行 参数2：终止行 参数3：起始列 参数4：终止列
   sheetAt.addMergedRegion(region1);
   //2、项目建设的合并 (当项目建设有数据时)
   if(statisticInfoByProjectId.size()!=0){
      Map<Integer, int[]> mergeMap2 =new HashMap<>();
      mergeMap1.put(1,null);
      PoiMergeCellUtil.mergeCells(sheetAt, mergeMap1, endRow+2,sheetAt.getLastRowNum()-3);
   //合并项目支出费用的合计
   CellRangeAddress region2 = new CellRangeAddress(sheetAt.getLastRowNum()-2, sheetAt.getLastRowNum()-2, (short) 1, (short) 2); //参数1：起始行 参数2：终止行 参数3：起始列 参数4：终止列
   sheetAt.addMergedRegion(region2);
   }

   //设置单元格样式
   CellStyle cellStyle = workbook.createCellStyle();//新建单元格样式
   cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中
   cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
   cellStyle.setWrapText(true);//设置自动换行
   //为所有的单元格渲染样式
   int rowNum = sheetAt.getLastRowNum();
   System.out.println(rowNum);
   for(int i=3;i<rowNum;i++){
      Row row = sheetAt.getRow(i);
      int colNum = row.getPhysicalNumberOfCells();
      for(int j=0;j<colNum;j++){
          //对金钱格式进行特殊处理
               if(j==3){
                   DataFormat dataFormat = workbook.createDataFormat();// 此处设置数据格式
                   cellStyle.setDataFormat(dataFormat.getFormat("#,##0.00"));
               }
         Cell cell = row.getCell((short) j);
         cell.setCellStyle(cellStyle);
         cell.setCellType(HSSFCell.CELL_TYPE_STRING);
      }
   }
   return workbook;
}
 

效果如下：

 

下面是我用到的两个合并单元格的方法

// 竖向合并相同单元格，必须保证被合并的需要有两个及两个以上的单元格
// Map<Integer, int[]>  mergeMap  ===>  key--列,value--依赖的列,没有传空
// startRow 起始行   endRow 结束行
public static void mergeCells(Sheet sheet, Map<Integer, int[]> mergeMap, int startRow,int endRow) {}


//合并一个区域类的单元格
//参数1：起始行 参数2：终止行 参数3：起始列 参数4：终止列
CellRangeAddress region = new CellRangeAddress(endRow+1, endRow+1, (short) 1, (short) 2); 
sheet.addMergedRegion(region);

给单元格设置样式

HSSFCellStyle cellStyle = wb.createCellStyle();  

 一、设置背景色:
cellStyle.setFillForegroundColor((short) 13);// 设置背景色  
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND); 

二、设置边框:
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框  
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框  
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框  
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框 
 
三、设置居中:
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中  

四、设置字体:
HSSFFont font = wb.createFont();  
font.setFontName("黑体");  
font.setFontHeightInPoints((short) 16);//设置字体大小   
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示  
font.setFontHeightInPoints((short) 12);  
  
cellStyle.setFont(font);//选择需要用到的字体格式  

五、设置列宽:
sheet.setColumnWidth(0, 3766); 
//第一个参数代表列id(从0开始),第2个参数代表宽度值  参考 ："2012-08-10"的宽度为2500  

六、设置自动换行:
cellStyle.setWrapText(true);//设置自动换行
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原文地址：https://www.cnblogs.com/houchen/p/12834369.html