使用service.selectMapsPage获取到map类型的分页数据，取出map类型的集合。由于集合中的任意一个元素都是excel中任意一行的完整数据，所以对mapList.get(0).entrySet()进行for循环得到key的集合，即对应的表中字段集合。
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excel标题
在对应的xxControl中定义标题集合，以及标题和字段对应关系的集合。（因为list集合是有序的！！利用有序的特点可以将数据有序地放进excel中，keyValueList 集合的顺序和页面显示的顺序是一致的。）
@Override
public String[] keyArray() {
String[] headers = {"科目名称", "级别", "理论", "操作", "理、操", "人数总计", "费用总计"};
return headers;
}
@Override
public List keyValueRelation() {
List keyValueList = new ArrayList<>();
keyValueList.add(new KeyValue("subject", "科目名称"));
keyValueList.add(new KeyValue("levelname", "级别"));
keyValueList.add(new KeyValue("theryNum", "理论"));
keyValueList.add(new KeyValue("operateNum", "操作"));
keyValueList.add(new KeyValue("theryOperateNum", "理、操"));
keyValueList.add(new KeyValue("allNum", "人数总计"));
keyValueList.add(new KeyValue("allMoney", "费用总计"));
return keyValueList;
}
headers集合和keyValueList集合长度是一样的，所以利用headers进行for循环或者keyValueList进行for循环都是一样的，都能够将keyValueList集合中的元素依次取出来，并拿到字段名（比如subject），再通过字段名将mapList中的值取出来存进单元格中。
for (short j = 0; j < headers.length; j++) {
// for (short j = 0; j < keyValueList.size(); j++) {
//创建单元格
Cell cell = row1.createCell(j);
String ziduan = keyValueList.get(j).getZiduan();
sheet.setColumnWidth(i, 256 * 15);//设置某列的列宽，列号为“i”
Object o = mapList.get(i).get(ziduan);
System.out.println(o);
cell.setCellValue(mapList.get(i).get(ziduan) == null ? " " : mapList.get(i).get(ziduan).toString());
}
对应xxControl代码
public class BaseRestController, M extends BaseMapper, T, I extends Serializable> {
/**
* 导出接口，暂时未用
*/
@RequestMapping(value = "export", method = RequestMethod.GET)
public ResponseObj export(@ModelAttribute Page page,
@ModelAttribute T model,
HttpServletResponse response,
HttpServletRequest request) throws Exception {
String name = model.getClass().getSimpleName();
Page> mapPage = service.selectMapsPage(page, queryWrapper(new EntityWrapper(model)));
List> mapList = mapPage.getRecords();
// Page pageList = service.selectPage(page, queryWrapper(new EntityWrapper<>(model)));
// List records = pageList.getRecords();
List keyValueList = keyValueRelation();
if (mapList != null && mapList.size() > 0) {
List keyList = new ArrayList<>(); //key的集合
for (Map.Entry entry : mapList.get(0).entrySet()) {
String key = entry.getKey();
keyList.add(key);
}
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("信息表");
String fileName = null;
if (name.equals("CostForJnjd")) {
fileName = "技能鉴定-费用统计" + ".xls";//设置要导出的文件的名字
} else if (name.equals("CostForGcs")) {
fileName = "通讯工程师-费用统计" + ".xls";//设置要导出的文件的名字
} else if (name.equals("CostForGg")) {
fileName = "高工评审-费用统计" + ".xls";//设置要导出的文件的名字
}
String[] headers = keyArray();
//headers表示excel表中第一行的表头
HSSFRow row = sheet.createRow(0);
//设置列名
for (int i = 0; i < headers.length; i++) {
Cell cell = row.createCell(i);
cell.setCellValue(headers[i]);
}
for (int i = 1; i < mapList.size(); i++) {
//创建行
HSSFRow row1 = sheet.createRow(i);
for (short j = 0; j < keyList.size(); j++) {
//创建单元格
Cell cell = row1.createCell(j);
String ziduan = keyValueList.get(j).getZiduan();
// cell.setCellType(HSSFCell.CELL_TYPE_STRING);
sheet.setColumnWidth(i, 256 * 15);//设置某列的列宽，列号为“i”
Object o = mapList.get(i).get(ziduan);
System.out.println(o);
cell.setCellValue(mapList.get(i).get(ziduan) == null ? " " : mapList.get(i).get(ziduan).toString());
}
}
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
response.flushBuffer();
workbook.write(response.getOutputStream());
return new ResponseObj<>(true, RetCode.SUCCESS);
} else {
// 无导出数据
request.setAttribute("noDataToExport", "没有数据可以导出!");
return new ResponseObj<>(false, RetCode.FAIL);
}
}
public void convertRow(HSSFRow row, T t) {
}
/**
* 表格里表头和数据的对应关系
* 按前端页面展示的顺序排列
* @return
*/
public List keyValueRelation() {
return null;
}
/**
* 表头数组
* @return
*/
public String[] keyArray() {
return null;
}
}
接口调用：http://127.0.0.1:10002/api/feeAnalysis/export?current=1&size=20