一、简介

easypoi功能如同名字easy,主打的功能就是容易,让一个没见接触过poi的人员就可以方便的写出Excel导出,Excel模板导出,Excel导入,Word模板导出,通过简单的注解和模板语言(熟悉的表达式语法),完成以前复杂的写法.
1.添加依赖项
2.改造模型，添加注解
3.从数据库查询数据，使用Easypoi工具类生成Workbook对象，存储为文件（导出）。

二、导出的excel格式

三、项目中的maven依赖

<!--EasyPoi导入导出-->
<dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-base</artifactId><version>4.3.0</version>
</dependency>
<dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-web</artifactId><version>4.3.0</version>
</dependency>
<dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-annotation</artifactId><version>4.3.0</version>
</dependency>

easyexcel 和项目现版本的poi版本冲突解决办法：项目之前用的poi的版本是3.9，后来使用easyexcel的时候，出现某些类找不到，这是因为poi.jar包版本冲突导致的，maven会自动使用最高级的版本，而easyexcel是3.1.7，将项目依赖的poi升级到4.1.2就好了。

四、设计好生成的excel模板实体类

1.导出对应的实体类（一对多中的“一”）

@Data
/*** @author dz* @date 2021/2/21* @description 合同明细主表*/
@Data
@ExcelTarget("toalExcel")
public class ToalExcel {@ExcelEntity(id="ContractManagement")private ContractManagementExcel contractManagementExcel ;@ExcelCollection(name = "采购合同明细",orderNum="4")private List<PurchaseContractofProjectExcel> pexcel;@ExcelEntity(id="ContractManagement2")private ContractManagementExcel2 contractManagementExcel2 ;@ExcelCollection(name = "销售合同明细",orderNum="2")private List<SalesContractofProjectExcel> sexcel;@ExcelEntity(id="ContractManagement3")private ContractManagementExcel3 contractManagementExcel3 ;}

@Data
/*** @author dz* @date 2021/2/21* @description 合同明细主表-项目信息1*/
@Data
public class ContractManagementExcel {@Excel(name = "序号",needMerge = true)private String serialNumber;@Excel(name = "项目编号",needMerge = true)private String businessSn;@Excel(name = "项目名称",needMerge = true,width = 20)private String businessName;}

@Data
/*** @author dz* @date 2021/2/21* @description 合同明细主表-项目信息2*/
@Data
public class ContractManagementExcel2 {@Excel(name = "客户",needMerge = true)private  String customer;@Excel(name = "销售总金额",needMerge = true)private String forecastIncome;
}

 @Data/*** @author dz* @date 2021/2/21* @description 合同明细主表-项目信息3*/
@Data
public class ContractManagementExcel3 {@Excel(name = "税后净利润",needMerge = true)private String netProfitAfterTax;@Excel(name = "合同利润率",needMerge = true)private String contractProfitMargin;
}

2.导出对应的实体类（一对多中的“多”）

@Data
/*** @author dz* @date 2021/2/21* @description 合同明细主表-采购合同表*/
@Data
public class PurchaseContractofProjectExcel {@Excel(name = "供应商",width = 20)private  String supplier;@Excel(name = "采购成本",width = 15)private String procurementCosts;@Excel(name = "付款进度",width = 15)private String paymentSchedule;@Excel(name = "收票金额",width = 15)private String ticketAmount;
}

@Data
/*** @author dz* @date 2021/2/21* @description 合同明细主表-销售合同*/
public class SalesContractofProjectExcel {@Excel(name = "客户",width = 15)private String customer;@Excel(name = "销售金额",width = 15)private String salesAmount;@Excel(name = "收款进度",width = 15)private String collectionSchedule;@Excel(name = "开票金额",width = 15)private String invoiceAmount;
}

五、controller层对需要的导出的数据生成格式

1.对数据进行操作

/*** 导出表格数据*/@ApiOperationSupport(order = 5)@ApiOperation(value = "导出列表表格")@GetMapping("/export-company")@ApiImplicitParams({@ApiImplicitParam(name = "ids", value = "要打印的数据id", dataType = "String", required = false)})public void exportCompanyceshi(HttpServletResponse response, String ids) throws Exception {List<Long> longs = Func.toLongList(ids);List<ToalExcel> list = new ArrayList<>();Integer num = 0;List<Map<String, Object>> projectVOList = exportExcelService.getprojectVOExcelList(longs);List<Map<String, Object>> businessVOList = exportExcelService.getbusinessVOExcelList(longs);List<Map<String, Object>> purchaseContractVOList = exportExcelService.getpurchaseContractVOExcelList(longs);List<Long> purchaseContractIds = new ArrayList<>();if (purchaseContractVOList != null) {for (Map map : purchaseContractVOList) {String str = String.valueOf(map.get("id"));Long id = Long.parseLong(str);purchaseContractIds.add(id);}}List<Map<String, Object>> purchasePaymentProcessVOList = exportExcelService.getpurchasePaymentProcessVOExcelList(purchaseContractIds);List<Map<String, Object>> receiptStatusEntityList = exportExcelService.getreceiptStatusEntityExcelList(purchaseContractIds);List<Map<String, Object>> salesContractVOList = exportExcelService.getsalesContractVOExcelList(longs);List<Long> salesContractIds = new ArrayList<>();if (salesContractVOList != null) {for (Map map : salesContractVOList) {String str = String.valueOf(map.get("id"));Long id = Long.parseLong(str);salesContractIds.add(id);}}List<Map<String, Object>> salesCollectionProcessEntityList = exportExcelService.getsalesCollectionProcessEntityExcelList(salesContractIds);List<Map<String, Object>> invoicingStatusEntityList = exportExcelService.getinvoicingStatusEntityExcelList(salesContractIds);for (int a = 0; a < longs.size(); a++) {String businessSn = "";String businessName = "";String customerName = "";String forecastIncome = "";String contractProfitMargin = "";String netProfitAfterTax = "";ContractManagementExcel contractManagementExcel = new ContractManagementExcel();List<PurchaseContractofProjectExcel> pExcel = new ArrayList<>();ContractManagementExcel2 contractManagementExcel2 = new ContractManagementExcel2();List<SalesContractofProjectExcel> sExcel = new ArrayList<>();ContractManagementExcel3 contractManagementExcel3 = new ContractManagementExcel3();//Map projectvo = projectVOList.get(a);forecastIncome = String.valueOf(projectVOList.get(a).get("forecastIncome"));contractProfitMargin = String.valueOf(projectVOList.get(a).get("contractProfitMargin"));netProfitAfterTax = String.valueOf(projectVOList.get(a).get("netProfitAfterTax"));//商机明细for (int b = 0; b < businessVOList.size(); b++) {if (projectVOList.get(a).get("id").equals(businessVOList.get(b).get("id"))) {businessSn = String.valueOf(businessVOList.get(b).get("businessSn"));businessName = String.valueOf(businessVOList.get(b).get("businessName"));customerName = String.valueOf(businessVOList.get(b).get("customerName"));}}contractManagementExcel.setSerialNumber(a+1+"");contractManagementExcel.setBusinessSn(businessSn);contractManagementExcel.setBusinessName(businessName);contractManagementExcel2.setCustomer(customerName);contractManagementExcel2.setForecastIncome(forecastIncome);contractManagementExcel3.setContractProfitMargin(contractProfitMargin);contractManagementExcel3.setNetProfitAfterTax(netProfitAfterTax);if (purchaseContractVOList!=null) {//采购合同明细for (int c = 0; c < purchaseContractVOList.size(); c++) {if (projectVOList.get(a).get("id").equals(purchaseContractVOList.get(c).get("projectId").toString())){PurchaseContractofProjectExcel p = new PurchaseContractofProjectExcel();String name = "";String amount = "";name = String.valueOf(purchaseContractVOList.get(c).get("customerName"));amount = String.valueOf(purchaseContractVOList.get(c).get("amount"));p.setSupplier(name);p.setProcurementCosts(amount);if (purchasePaymentProcessVOList != null) {String purchasePaymentProcessMessage = "";for (int e = 0; e < purchasePaymentProcessVOList.size(); e++) {String start="";String alias = "";String money = "";if (purchaseContractVOList.get(c).get("id").equals(purchasePaymentProcessVOList.get(e).get("purchaseContractId").toString())) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");if (purchasePaymentProcessVOList.get(e).get("finishTime") != null) {Date date = (Date) purchasePaymentProcessVOList.get(e).get("finishTime");start = sdf.format(date);}if (purchasePaymentProcessVOList.get(e).get("alias") != null) {alias = String.valueOf(purchasePaymentProcessVOList.get(e).get("alias"));}if (purchasePaymentProcessVOList.get(e).get("amount") != null) {money = String.valueOf(purchasePaymentProcessVOList.get(e).get("amount"));}purchasePaymentProcessMessage += start + "," + alias + "," + money + "\n";}}p.setPaymentSchedule(purchasePaymentProcessMessage);}if (receiptStatusEntityList != null) {String receiptStatusMessage = "";for (int f = 0; f < receiptStatusEntityList.size(); f++) {String start = "";String money = "";if (purchaseContractVOList.get(c).get("id").equals(receiptStatusEntityList.get(f).get("purchaseContractId").toString())) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");if (receiptStatusEntityList.get(f).get("createTime") != null) {Date date = (Date) receiptStatusEntityList.get(f).get("createTime");start = sdf.format(date);}if (receiptStatusEntityList.get(f).get("amount") != null) {money = String.valueOf(receiptStatusEntityList.get(f).get("amount"));}receiptStatusMessage += start + "," + money + "\n";}}p.setTicketAmount(receiptStatusMessage);}pExcel.add(p);}}}if (salesContractVOList!=null){//销售合同明细for (int d = 0; d < salesContractVOList.size(); d++) {if (projectVOList.get(a).get("id").equals(salesContractVOList.get(d).get("projectId").toString())) {SalesContractofProjectExcel s=new SalesContractofProjectExcel();String name="";String amount="";if (salesContractVOList.get(d).get("name")!=null){name=salesContractVOList.get(d).get("name").toString();}if (salesContractVOList.get(d).get("amount")!=null){amount=salesContractVOList.get(d).get("amount").toString();}s.setCustomer(name);s.setSalesAmount(amount);if (salesCollectionProcessEntityList!=null) {String salesCollectionProcessMessage = "";for (int g = 0; g < salesCollectionProcessEntityList.size(); g++) {String start = "";String bank = "";String money = "";if (salesContractVOList.get(d).get("id").equals(salesCollectionProcessEntityList.get(g).get("salesContractId").toString())){SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");if (salesCollectionProcessEntityList.get(g).get("time") != null) {Date date = (Date) salesCollectionProcessEntityList.get(g).get("time");start = sdf.format(date);}if (salesCollectionProcessEntityList.get(g).get("bank") != null) {bank = String.valueOf(salesCollectionProcessEntityList.get(g).get("bank"));}if (salesCollectionProcessEntityList.get(g).get("amount") != null) {money = String.valueOf(salesCollectionProcessEntityList.get(g).get("amount"));}salesCollectionProcessMessage += start + "," + bank + "," + money + "\n";}}s.setCollectionSchedule(salesCollectionProcessMessage);}if (invoicingStatusEntityList!=null) {String invoicingStatusMessage = "";for (int h = 0; h < invoicingStatusEntityList.size(); h++) {String start = "";String money = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");if (salesContractVOList.get(d).get("id").equals(invoicingStatusEntityList.get(h).get("salesContractId").toString())){if (invoicingStatusEntityList.get(h).get("finishTime") != null) {Date date = (Date) invoicingStatusEntityList.get(h).get("finishTime");start = sdf.format(date);}if (invoicingStatusEntityList.get(h).get("amount") != null) {money = String.valueOf(invoicingStatusEntityList.get(h).get("amount"));}invoicingStatusMessage += start + "," + money + "\n";}}s.setInvoiceAmount(invoicingStatusMessage);}sExcel.add(s);}}}ToalExcel toalExcel=new ToalExcel();toalExcel.setContractManagementExcel(contractManagementExcel);toalExcel.setContractManagementExcel2(contractManagementExcel2);toalExcel.setContractManagementExcel3(contractManagementExcel3);toalExcel.setSexcel(sExcel);toalExcel.setPexcel(pExcel);list.add(toalExcel);}// 简单模板导出方法ExportParams params = new ExportParams();params.setSheetName("合同管理");//设置sheet名params.setType(ExcelType.XSSF);Workbook workbook =   ExcelExportUtil.exportExcel(params, ToalExcel.class, list);//返回头设置下载，并设置文件名，返回setExportExcelFormat(response, workbook, "合同管理");}

2.导出excel格式设置

/*** excel导出时* 返回头设置下载，并设置文件名* * @param response* @param workbook* @param fileName* @throws Exception*/
private void setExportExcelFormat(HttpServletResponse response, Workbook workbook, String fileName) throws Exception {ServletOutputStream outStream = null;fileName = "合同明细.xlsx";//创建文件名(改)String fileNameURL = URLEncoder.encode(fileName, "UTF-8");response.setContentType("octets/stream");response.setHeader("Content-disposition", "attachment;filename=" + fileNameURL + ";" + "filename*=utf-8''" + fileNameURL);response.addHeader("Pargam", "no-cache");response.addHeader("Cache-Control", "no-cache");try {outStream = response.getOutputStream();workbook.write(outStream);} finally {outStream.close();}
}

六、导出excel模板数据

EasyPOI官方操作文档

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