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导出excel报表之类，相信有过1~2年开发经验的至少都做过了。但是大多应该都是传统的SSH或SSM架构，相对于在最近流行的SpringCloud分布式架构上做类似导出，可能经历不是那么多。
鄙人做过的导出excel报表，有2种方案：
- Poi原生的，jar类库
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.9</version> </dependency>HSSFWorkbook、HSSFSheet、HSSFCellStyle等一系列，poi包中类库。优势：可以根据业务需要最大限度的格式化excel报表（合并单元格/居中/字体颜色等）；此种方案见另一篇资料： poi格式导出excelpoi方法参考另一篇博文：poi方法导出excel文档 - apache系列的commons-csv类库：CSVPrinter
<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-csv</artifactId> <version>1.4</version> </dependency>由于本人项目中，之前统一了导出方案由：CSVPrinter格式，也妥协于api-zuul网关的输入输出流格式的限制，最终选用此种。优势：可与查询接口合并，查询数据供前端页面调用，导出直接输出excel文档。
今天跟大家分享一下，在SpringCloud架构下，导出excel报表的经验。同时又错误或遗漏之处欢迎指正建议，感激。
xml报文内容格式：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Root>
<SttlCntNb>2</SttlCntNb>
<DebitCntAmt>CNY0.00</DebitCntAmt>
<CreditCntAmt>CNY4700.00</CreditCntAmt>
<SttlList>
<SttlInf>
<SttlReptFlg>2018052500170139</SttlReptFlg>
<SttlDCFlg>2</SttlDCFlg>
<SttlAmt>CNY100.00</SttlAmt>
<BatchList>
<BatchInf>
<BatchId>B201805230015</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY100.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0113|C3228644000018|04|CNY0.00|0|CNY5.00|1|</SubItemInf>
<SubItemInf>0120|C3228640000020|05|CNY50.00|1|CNY0.00|0|</SubItemInf>
<SubItemInf>0114|C3228640000029|07|CNY0.00|0|CNY5.00|1|</SubItemInf>
<SubItemInf>0115|C3228640000019|06|CNY0.00|0|CNY5.00|1|</SubItemInf>
<SubItemInf>0111|C3228640000016|03|CNY0.00|0|CNY10.00|1|</SubItemInf>
<SubItemInf>0110|C3228644000016|01|CNY0.00|0|CNY110.00|1|</SubItemInf>
<SubItemInf>0112|C3228644000017|99|CNY0.00|0|CNY5.00|1|</SubItemInf>
<SubItemInf>0110|C3228644000016|02|CNY0.00|0|CNY10.00|1|</SubItemInf>
</SubItemList>
</BatchInf>
</BatchList>
</SttlInf>
<SttlInf>
<SttlReptFlg>2018052500170138</SttlReptFlg>
<SttlDCFlg>2</SttlDCFlg>
<SttlAmt>CNY4600.00</SttlAmt>
<BatchList>
<BatchInf>
<BatchId>B201805240001</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY400.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0126|C1010511003703|00|CNY0.00|4|CNY0.00|0|</SubItemInf>
<SubItemInf>0125|C1010211000012|01|CNY0.00|8|CNY0.00|0|</SubItemInf>
<SubItemInf>0126|C1010211000012|01|CNY0.00|8|CNY0.00|0|</SubItemInf>
<SubItemInf>0124|C1010211000012|01|CNY0.00|8|CNY0.00|0|</SubItemInf>
<SubItemInf>0123|C1010211000012|01|CNY0.00|4|CNY0.00|0|</SubItemInf>
<SubItemInf>0110|C1010211000012|01|CNY0.00|0|CNY400.00|2|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240002</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY400.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0125|C1010211000012|00|CNY400.00|4|CNY0.00|0|</SubItemInf>
<SubItemInf>0110|C1010211000012|00|CNY0.00|0|CNY800.00|2|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240003</BatchId>
<BatchDCFlg>1</BatchDCFlg>
<BatchNetAmt>CNY0.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0120|C1010211000012|00|CNY0.00|4|CNY0.00|0|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240004</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY1200.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0112|C1010211000012|01|CNY0.00|0|CNY1200.00|2|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240005</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY400.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0113|C1010211000012|00|CNY0.00|0|CNY400.00|4|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240006</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY400.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0114|C1010211000012|00|CNY0.00|0|CNY400.00|4|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240007</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY200.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0115|C1010211000012|01|CNY0.00|0|CNY200.00|2|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240008</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY600.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0115|C1010211000012|01|CNY0.00|0|CNY600.00|2|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240009</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY400.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0110|C1010511003703|00|CNY0.00|0|CNY400.00|2|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240010</BatchId>
<BatchDCFlg>2</BatchDCFlg>
<BatchNetAmt>CNY1200.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0111|C1010211000012|01|CNY0.00|0|CNY1200.00|4|</SubItemInf>
</SubItemList>
</BatchInf>
<BatchInf>
<BatchId>B201805240012</BatchId>
<BatchDCFlg>1</BatchDCFlg>
<BatchNetAmt>CNY1200.00</BatchNetAmt>
<SubItemList>
<SubItemInf>0116|C1010511003703|00|CNY1200.00|4|CNY0.00|0|</SubItemInf>
</SubItemList>
</BatchInf>
</BatchList>
</SttlInf>
</SttlList>
</Root>可以看到嵌套了好几层：SttlList—>SttlInf—>BatchList—>BatchInf—>SubItemList—>SubItemInf
其中，要先把xml报文解析成obj对象，根据xml报文拆分后封装的obj对象，对于xml报文解析可查看另一篇：
核心类库是：
1、org.apache.commons.csv 类库中的CSVPrinter进行打印输出。
2、借助java.io的输入输出流等
-
HttpServletRequest -
HttpServletResponse -
OutputStream/OutputStreamWriter
3、org.apache.commons.io关闭CSVPrinter打印输出流。
上代码：接口Controller控制入口类:
@RequestMapping(value = "/export")
@Logable(businessTag = "accountInfoExport")
@Exceptionable
@Validatable
@ApiOperation(value = "对账文件导出", notes = "对账文件导出", httpMethod = "GET")
@ApiImplicitParams({
@ApiImplicitParam(name = "accountDate", value = "对账日期（yyyy-MM-dd）", required = true, dataType = "String", length = 100, paramType = "query"),
@ApiImplicitParam(name = "download", value = "是否下载:true/false", required = true, dataType = "boolean", length = 100, paramType = "query"),
@ApiImplicitParam(name = "fileName", value = "例:AccountInfo", required = true, dataType = "String", length = 100, paramType = "query"),
@ApiImplicitParam(name = "type", value = "格式:csv", required = true, dataType = "String", length = 100, paramType = "query")})
public PageResult<SettInfoExportDto> exportAccountInfo(@RequestParam String accountDate,
@RequestParam(value = "download", required = true) boolean download,
@RequestParam(value = "fileName", required = true) String fileName,
@RequestParam(value = "type", required = true) String type,
HttpServletRequest request, HttpServletResponse response) {
PageResult<SettInfoExportDto> pageResult = new PageResult<SettInfoExportDto>();
AccountInfoEntityResp accountInfoEntityResp = accountInfoService.getLocalAccountInf(accountDate);
//1.结算场次列表
List<String> settListTitles = new ArrayList<>();
settListTitles.add("报文标识号");
settListTitles.add("场次借贷标识");
settListTitles.add("场次金额");
//2.批次列表
List<String> batchInfListTitles = new ArrayList<>();
batchInfListTitles.add("报文标识号");
batchInfListTitles.add("批次号");
batchInfListTitles.add("批次借贷标识");
batchInfListTitles.add("批次金额");
//3.分项列表
List<String> sttlInfListTitles = new ArrayList<>();
sttlInfListTitles.add("批次号");
sttlInfListTitles.add("业务类型");
sttlInfListTitles.add("银行金额机构标识");
sttlInfListTitles.add("账户类型");
sttlInfListTitles.add("分项借方发生额");
sttlInfListTitles.add("分项借方发生笔数");
sttlInfListTitles.add("分项贷方发生额");
sttlInfListTitles.add("分项贷方发生笔数");
//4.账务日期...
Map<String, String> statisticsData = new HashMap<>();
String settCount = accountInfoEntityResp.getSttlCntNb().toString();
String debitAmount = accountInfoEntityResp.getDebitCntAmt().toString();
String creditAmount = accountInfoEntityResp.getCreditCntAmt().toString();
statisticsData.put("财务日期:", accountDate.replace("//-","///"));
statisticsData.put("结算总笔数", settCount);
statisticsData.put("借方金额", debitAmount);
statisticsData.put("贷方金额", creditAmount);
//5.结算场次列表数据list
List<SettInfoExportDto> settInfoExportDtoList = new ArrayList<SettInfoExportDto>();
//6.批次列表数据list
List<BatchInfExportDto> batchInfExportDtoList = new ArrayList<BatchInfExportDto>();
//7.分项列表数据list
List<SubItemInfoExportDto> subItemInfoExportDtoList = new ArrayList<SubItemInfoExportDto>();
if(accountInfoEntityResp.getSttlList() != null){
//结算场次列表数据
for(int i=0; i<accountInfoEntityResp.getSttlList().size(); i++){
SettInfoExportDto settInfoExportDto = new SettInfoExportDto();
settInfoExportDto.setSttlAmt(accountInfoEntityResp.getSttlList().get(i).getSttlAmt());
settInfoExportDto.setSttlDCFlg(accountInfoServiceImpl.DCFlag(accountInfoEntityResp.getSttlList().get(i).getSttlDCFlg()));
settInfoExportDto.setSttlReptFlg(accountInfoEntityResp.getSttlList().get(i).getSttlReptFlg());
settInfoExportDtoList.add(settInfoExportDto);
//批次列表数据
if(accountInfoEntityResp.getSttlList().get(i).getBatchList() != null){
for(int j= 0; j<accountInfoEntityResp.getSttlList().get(i).getBatchList().size(); j++) {
BatchInfExportDto batchInfExportDto = new BatchInfExportDto();
batchInfExportDto.setSttlReptFlg(accountInfoEntityResp.getSttlList().get(i).getSttlReptFlg());
batchInfExportDto.setBatchDCFlg(accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getBatchDCFlg());
batchInfExportDto.setBatchId(accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getBatchId());
batchInfExportDto.setBatchNetAmt(accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getBatchNetAmt());
batchInfExportDtoList.add(batchInfExportDto);
//分项列表数据
if(accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getSubItemList() != null){
for(int f=0; f< accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getSubItemList().size(); f++){
SubItemInfoExportDto subItemInfoExportDto = new SubItemInfoExportDto();
subItemInfoExportDto.setBatchId(accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getBatchId());
String subStr = accountInfoEntityResp.getSttlList().get(i).getBatchList().get(j).getSubItemList().get(f).getSubItemInf();
subStr = subStr.replace("CNY","");
String[] subArray = {};
subArray = subStr.split("\\|");
subItemInfoExportDto.setBusinessType(accountInfoServiceImpl.busiType(subArray[0]));
subItemInfoExportDto.setBankOrgFlag(subArray[1]);
subItemInfoExportDto.setAccountType(accountInfoServiceImpl.accountType(subArray[2]));
subItemInfoExportDto.setDebitSplitAmount(subArray[3]);
subItemInfoExportDto.setDebitSplitCount(Integer.valueOf(subArray[4]));
subItemInfoExportDto.setCreditSplitAmount(subArray[5]);
subItemInfoExportDto.setCreditSplitCount(Integer.valueOf(subArray[6]));
subItemInfoExportDtoList.add(subItemInfoExportDto);
}
}
}
}
}
}
settListTitles.addAll(batchInfListTitles);
settListTitles.addAll(sttlInfListTitles);
CSVPrinter csvPrinter = accountInfoService.downloadCsv(request, response, settListTitles);
pageResult.setTitles(settListTitles);
pageResult.setResult(Constants.detailReturnCode.RETURN_SUCCESS.code);
pageResult.setRows(settInfoExportDtoList);
accountInfoService.printlnCsv(csvPrinter,statisticsData,settInfoExportDtoList,batchInfExportDtoList,
subItemInfoExportDtoList,settListTitles,batchInfListTitles,sttlInfListTitles);
IOUtils.closeQuietly(csvPrinter);
return null;
}输入输出流，封装CSVPrinter对象：
public CSVPrinter downloadCsv(HttpServletRequest request, HttpServletResponse response, List<String> titles) {
try {
// 获取数据
String fileName = request.getParameter("fileName");
// 设置文件名, 用于下载
response.setContentType("application/csv;charset=UTF-8");
response.addHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "utf-8"));
// 添加UTF-8的BOM头，避免Excel打开文件时使用系统默认编码产生乱码
byte[] byteBOM = new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF };
OutputStream outputStream = response.getOutputStream();
outputStream.write(byteBOM);
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, "utf-8");
CSVPrinter printer = CSVFormat.DEFAULT.withHeader(titles.toArray(new String[titles.size()])).print(outputStreamWriter);
return printer;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}csv导出记录：
public void printlnCsv(CSVPrinter printer, Map<String, String> statisticsData,List<SettInfoExportDto> settInfoExportDtoList,
List<BatchInfExportDto> batchInfExportDtoList,List<SubItemInfoExportDto> subItemInfoExportDtoList,
List<String> settListTitles,List<String> batchInfListTitles,List<String> sttlInfListTitles){
if(subItemInfoExportDtoList.size() > 0){
try{
//报文标识号
String sttlReptFlg = null;
//结算列表数据
for(SettInfoExportDto row:settInfoExportDtoList){
Field[] declaredFields = row.getClass().getDeclaredFields();
for (Field declaredField : declaredFields) {
declaredField.setAccessible(true);
FieldAnnotation annotation = declaredField.getAnnotation(FieldAnnotation.class);
if (annotation == null) {
// 只有注解了 FieldAnnotation 的字段，才会输出
continue;
}
Object value = declaredField.get(row);
if (StringUtils.equals(annotation.fieldName(), "报文标识号")) {
sttlReptFlg = (String) value;
}
printer.print(value + "\t");
}
// 换行
printer.println();
//打印批次列表数据
printBacthRecord(printer,sttlReptFlg, batchInfExportDtoList, subItemInfoExportDtoList, settListTitles
,batchInfListTitles, sttlInfListTitles);
}
// 换行
printer.println();
//手续费行
if (statisticsData != null && !statisticsData.isEmpty()) {
Iterator<String> iterator = statisticsData.keySet().iterator();
while (iterator.hasNext()) {
String key = (String) iterator.next();
printer.print(key);
printer.print(statisticsData.get(key));
// 换行
printer.println();
}
byte[] nulls = new byte[] { (byte) 00, (byte) 00, (byte) 00 };
printer.print(new String(nulls));
}
printer.flush();
}catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 打印批次列表数据
*/
public void printBacthRecord(CSVPrinter printer,String sttlReptFlg,List<BatchInfExportDto> batchInfExportDtoList,
List<SubItemInfoExportDto> subItemInfoExportDtoList,List<String> settListTitles ,
List<String> batchInfListTitles,List<String> sttlInfListTitles) throws IOException {
int i = settListTitles.size() - batchInfListTitles.size() - sttlInfListTitles.size();
//取出该报文标识号的批次列表
List<BatchInfExportDto> printBatchInfoList = new ArrayList<BatchInfExportDto>();
if(batchInfExportDtoList != null && batchInfExportDtoList.size()>0){
for(BatchInfExportDto record:batchInfExportDtoList){
if(record.getSttlReptFlg().equals(sttlReptFlg)){
printBatchInfoList.add(record);
}
}
}
if (printBatchInfoList != null && !printBatchInfoList.isEmpty()) {
String batchId = null;
for (BatchInfExportDto bacthInfo : printBatchInfoList) {
byte[] nulls = new byte[i];
for (byte b : nulls) {
printer.print(new String(nulls));
}
printer.print(sttlReptFlg);
printer.print(bacthInfo.getBatchId());
printer.print(bacthInfo.getBatchDCFlg());
printer.print(bacthInfo.getBatchNetAmt());
batchId = bacthInfo.getBatchId();
// 换行
printer.println();
//打印分项列表数据
printSubItemRecord(printer,batchId,subItemInfoExportDtoList,settListTitles,sttlInfListTitles);
}
}
}
/**
* 打印分项列表数据
*/
public void printSubItemRecord(CSVPrinter printer,String batchId,List<SubItemInfoExportDto> subItemInfoExportDtoList,
List<String> settListTitles ,List<String> sttlInfListTitles ) throws IOException {
int i = settListTitles.size() - sttlInfListTitles.size();
//取出该批次号的分项列表
List<SubItemInfoExportDto> subItemPrintRecordList = new ArrayList<SubItemInfoExportDto>();
if(subItemInfoExportDtoList != null && subItemInfoExportDtoList.size()>0){
for(SubItemInfoExportDto record : subItemInfoExportDtoList){
if(record.getBatchId().equals(batchId)){
subItemPrintRecordList.add(record);
}
}
}
if (subItemPrintRecordList != null && !subItemPrintRecordList.isEmpty()) {
for (SubItemInfoExportDto subItemInfo : subItemPrintRecordList) {
byte[] nulls = new byte[i];
for (byte b : nulls) {
printer.print(new String(nulls));
}
printer.print(batchId);
printer.print(subItemInfo.getBusinessType());
printer.print(subItemInfo.getBankOrgFlag());
printer.print(subItemInfo.getAccountType());
printer.print(subItemInfo.getDebitSplitAmount());
printer.print(subItemInfo.getDebitSplitCount());
printer.print(subItemInfo.getCreditSplitAmount());
printer.print(subItemInfo.getDebitSplitCount());
// 换行
printer.println();
}
}
}主要核心代码以上。
最终导出效果如下：
