springboot导出excel（easyexcel和poi 列下拉及表格锁定）
最近做的项目导入的数据量比较大，直接用poi或者easypoi会可能会出现OOM的情况，综合考虑下用easyexcel，
pom引入所需包
<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>1.1.2-beta5</version>
</dependency>excelUtil.java
import com.alibaba.excel.EasyExcelFactory;
import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.support.ExcelTypeEnum;
import com.alibaba.excel.util.CollectionUtils;
import com.cmbchina.ccd.oa.socialsecurity.model.bo.ExcelListener;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @description: excel工具类
* @author: kongwc
* @create: 2019-09-23
*/
@Component
public class ExcelUtil {
private static Sheet initSheet;
static {
initSheet = new Sheet(1, 0);
initSheet.setSheetName("sheet");
//设置自适应宽度
initSheet.setAutoWidth(Boolean.TRUE);
}
/**
* 读取少于1000行数据
* 数据量少时，同步读取
*
* @param file 读取的文件
* @return
*/
public List<Object> readLessThan1000Row(MultipartFile file) throws IOException {
return readLessThan1000RowBySheet(file, null);
}
/**
* 读小于1000行数据
* filePath 文件绝对路径
* initSheet ：
* sheetNo: sheet页码，默认为1
* headLineMun: 从第几行开始读取数据，默认为0, 表示从第一行开始读取
* clazz: 返回数据List<Object> 中Object的类名
*/
public List<Object> readLessThan1000RowBySheet(MultipartFile file, Sheet sheet) throws IOException {
if (file == null) {
//log.info("导入文件为空", file);
return null;
}
sheet = sheet != null ? sheet : initSheet;
InputStream fileStream = null;
try {
fileStream = file.getInputStream();
return EasyExcelFactory.read(fileStream, sheet);
} catch (FileNotFoundException e) {
//log.info("文件有误, 文件：{}", file);
} finally {
try {
if (fileStream != null) {
fileStream.close();
}
} catch (IOException e) {
//log.info("excel文件读取失败, 失败原因：{}", e);
}
}
return null;
}
/**
* 生成excle
*
* @param filePath 绝对路径, 如：/home/Downloads/aaa.xlsx
* @param data 数据源
* @param head 表头
*/
public static void writeBySimple(String filePath, List<List<Object>> data, List<String> head) {
writeSimpleBySheet(filePath, data, head, null);
}
/**
* 生成excle
*
* @param filePath 绝对路径
* @param data 数据源
* @param sheet excle页面样式
* @param head 表头
*/
public static void writeSimpleBySheet(String filePath, List<List<Object>> data, List<String> head, Sheet sheet) {
sheet = (sheet != null) ? sheet : initSheet;
if (head != null) {
List<List<String>> list = new ArrayList<>();
head.forEach(h -> list.add(Collections.singletonList(h)));
sheet.setHead(list);
}
OutputStream outputStream = null;
ExcelWriter writer = null;
try {
outputStream = new FileOutputStream(filePath);
writer = EasyExcelFactory.getWriter(outputStream);
writer.write1(data, sheet);
} catch (FileNotFoundException e) {
//log.error("找不到文件或文件路径错误, 文件：{}", filePath);
} finally {
try {
if (writer != null) {
writer.finish();
}
if (outputStream != null) {
outputStream.close();
}
} catch (IOException e) {
//log.error("excel文件导出失败");
}
}
}
/**
* @Description 导出excel 支持一张表导出多个sheet
* @Param OutputStream 输出流
* Map<String, List> sheetName和每个sheet的数据
* ExcelTypeEnum 要导出的excel的类型 有ExcelTypeEnum.xls 和有ExcelTypeEnum.xlsx
*/
public void createExcel(HttpServletResponse response, Map<String, List<? extends BaseRowModel>> sheetNameAndDateList, ExcelTypeEnum type, String fileName) {
// if (checkParam(SheetNameAndDateList, type)) return;
try {
response.setContentType("multipart/form-data");
response.setCharacterEncoding("utf-8");
//解决导出文件名中文乱码
fileName = new String(fileName.getBytes(), "iso8859-1") + DateUtil.todayStr();
response.setHeader("Content-disposition", "attachment;filename=" + fileName + type.getValue());
ServletOutputStream out = response.getOutputStream();
ExcelWriter writer = new ExcelWriter(out, type, true);
setSheet(sheetNameAndDateList, writer);
writer.finish();
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @Description //setSheet数据
*/
private void setSheet(Map<String, List<? extends BaseRowModel>> SheetNameAndDateList, ExcelWriter writer) {
int sheetNum = 1;
for (Map.Entry<String, List<? extends BaseRowModel>> stringListEntry : SheetNameAndDateList.entrySet()) {
Sheet sheet = new Sheet(sheetNum, 0, stringListEntry.getValue().get(0).getClass());
sheet.setSheetName(stringListEntry.getKey());
writer.write(stringListEntry.getValue(), sheet);
sheetNum++;
}
}
/**
* @Description 校验参数
*/
private static boolean checkParam(Map<String, List<? extends BaseRowModel>> SheetNameAndDateList, ExcelTypeEnum type) {
if (CollectionUtils.isEmpty(SheetNameAndDateList)) {
//log.error("SheetNameAndDateList不能为空");
return true;
} else if (type == null) {
//log.error("导出的excel类型不能为空");
return true;
}
return false;
}
/**
* 读取某个 sheet 的 Excel
*
* @param excel 文件
* @param rowModel 实体类映射，继承 BaseRowModel 类
* @return Excel 数据 list
*/
public static List<Object> readExcel(MultipartFile excel, BaseRowModel rowModel) throws IOException {
return readExcel(excel, rowModel, 1, 1);
}
/**
* 读取某个 sheet 的 Excel
*
* @param excel 文件
* @param rowModel 实体类映射，继承 BaseRowModel 类
* @param sheetNo sheet 的序号 从1开始
* @return Excel 数据 list
*/
public Map<String, Object> readExcel(MultipartFile excel, BaseRowModel rowModel, int sheetNo) throws IOException {
Map<String, Object> result = new HashMap<>();
ExcelListener excelListener = new ExcelListener();
ExcelReader reader = getReader(excel, excelListener);
if (reader == null) {
return null;
}
reader.read(new Sheet(sheetNo, 0, rowModel.getClass()));
//校验表头
Boolean flag = false;
//维护实体类中 没有@ExcelProperty 放置在最后，会被映射出null表头
String head = excelListener.getImportHeads().replace("null,", "");
if (head.equals(excelListener.getModelHeads())) {
flag = true;
}
result.put("flag", flag);
result.put("datas", excelListener.getDatas());
return result;
}
/**
* 读取某个 sheet 的 Excel
*
* @param excel 文件
* @param rowModel 实体类映射，继承 BaseRowModel 类
* @param sheetNo sheet 的序号 从1开始
* @param headLineNum 表头行数，默认为1
* @return Excel 数据 list
*/
public static List<Object> readExcel(MultipartFile excel, BaseRowModel rowModel, int sheetNo, int headLineNum) throws IOException {
ExcelListener excelListener = new ExcelListener();
ExcelReader reader = getReader(excel, excelListener);
if (reader == null) {
return null;
}
reader.read(new Sheet(sheetNo, headLineNum, rowModel.getClass()));
return excelListener.getDatas();
}
/**
* 读取指定sheetName的Excel(多个 sheet)
*
* @param excel 文件
* @param rowModel 实体类映射，继承 BaseRowModel 类
* @return Excel 数据 list
* @throws IOException
*/
public static List<Object> readExcel(MultipartFile excel, BaseRowModel rowModel, String sheetName) throws IOException {
ExcelListener excelListener = new ExcelListener();
ExcelReader reader = getReader(excel, excelListener);
if (reader == null) {
return null;
}
for (Sheet sheet : reader.getSheets()) {
if (rowModel != null) {
sheet.setClazz(rowModel.getClass());
}
//读取指定名称的sheet
if (sheet.getSheetName().contains(sheetName)) {
reader.read(sheet);
break;
}
}
return excelListener.getDatas();
}
/**
* 返回 ExcelReader
*
* @param excel 需要解析的 Excel 文件
* @param excelListener new ExcelListener()
* @throws IOException
*/
private static ExcelReader getReader(MultipartFile excel, ExcelListener excelListener) throws IOException {
String filename = excel.getOriginalFilename();
if (filename != null && (filename.toLowerCase().endsWith(".xls") || filename.toLowerCase().endsWith(".xlsx"))) {
InputStream is = new BufferedInputStream(excel.getInputStream());
return new ExcelReader(is, null, excelListener, false);
} else {
return null;
}
}
}
但是easyexcel导出的功能还不丰富，比如带下拉选择的时候，还是需要原生的poi才行，所以决定导入数据量大的时候用easyexcel，导出时就用poi导出，由于easyexcel已引入poi，所以如果引入poi的时候要注意版本一致
pom文件
<!--poi相关 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>3.17</version>
</dependency>PoiExcelUtil.java
import com.alibaba.excel.util.StyleUtil;
import com.cmbchina.ccd.oa.socialsecurity.model.bo.excel.ColumnName;
import com.cmbchina.ccd.oa.socialsecurity.model.bo.excel.SelectData;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.message.BasicNameValuePair;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFDataValidation;
import org.apache.poi.xssf.usermodel.XSSFDataValidationConstraint;
import org.apache.poi.xssf.usermodel.XSSFDataValidationHelper;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Component;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Excel文件相关操作工具类
*
* @author kongwc
* @create 2018-05-09 18:23
*/
@Component
public class PoiExcelUtil<T> {
private static final String EXCEL_TEMPLATE = "classpath:/fileTemplate/EmailNoticeExcelTemplate.xlsx";
private static final String CANCEL_ORDER_EXCEL_TEMPLATE = "classpath:/fileTemplate/CancelOrder.xlsx";
/**
* 没有定义转换时间格式
*
* @param clazz
* @param stream
* @return
* @throws NoSuchFieldException
* @throws InstantiationException
* @throws IllegalAccessException
* @throws ParseException
* @throws IOException
*/
public List<T> excelToList(Class<T> clazz, InputStream stream)
throws NoSuchFieldException, InstantiationException, IllegalAccessException, ParseException, IOException {
return excelToListWithDateForMate(clazz, stream, null);
}
/**
* 定义转换时间格式
*
* @param clazz
* @param stream
* @param dateFormat
* @return
* @throws NoSuchFieldException
* @throws InstantiationException
* @throws IllegalAccessException
* @throws ParseException
* @throws IOException
*/
public List<T> excelToList(Class<T> clazz, InputStream stream, String dateFormat)
throws NoSuchFieldException, InstantiationException, IllegalAccessException, ParseException, IOException {
return excelToListWithDateForMate(clazz, stream, dateFormat);
}
/**
* 将文件流转成列表
*
* @param clazz 泛型类型
* @param stream 文件流
* @return 列表
*/
public List<T> excelToListWithDateForMate(Class<T> clazz, InputStream stream, String dateFormat)
throws IOException, IllegalAccessException, InstantiationException, NoSuchFieldException, ParseException,
ParseException {
if (dateFormat == null) {
dateFormat = "yyyy-MM-dd HH:mm:ss";
}
if (stream == null) {
return new ArrayList<>();
}
XSSFSheet xssfSheet = new XSSFWorkbook(stream).getSheetAt(0);
//开始、结束行号
int rowStart = xssfSheet.getFirstRowNum();
int rowEnd = xssfSheet.getLastRowNum();
XSSFRow columnNames = xssfSheet.getRow(rowStart);
//列的开始，结束
int cellStart = columnNames.getFirstCellNum();
int cellEnd = columnNames.getLastCellNum();
List<BasicNameValuePair> columnValues = new ArrayList<>();
Field[] fields = clazz.getDeclaredFields();
for (int k = cellStart; k < cellEnd; k++) {
for (Field fieldItem : fields) {
ColumnName cn = fieldItem.getAnnotation(ColumnName.class);
if (cn != null) {
String columnChineseName = fieldItem.getAnnotation(ColumnName.class).value();
if (columnNames.getCell(k).getStringCellValue().equals(columnChineseName)) {
columnValues.add(new BasicNameValuePair(fieldItem.getName(),
fieldItem.getGenericType().toString()));
break;
}
}
}
//导入的列与实际列不一致
if (columnValues.size() <= k - cellStart) {
return null;
}
}
List<T> result = new ArrayList<>();
for (int i = rowStart + 1; i <= rowEnd; i++) {
T t = clazz.newInstance();
XSSFRow row = xssfSheet.getRow(i);
//不为空行
if (row != null) {
for (int k = cellStart; k < cellEnd; k++) {
XSSFCell cell = row.getCell(k);
Field field = clazz.getDeclaredField(columnValues.get(k - cellStart).getName());
field.setAccessible(true);
switch (columnValues.get(k - cellStart).getValue()) {
case "class java.lang.String":
field.set(t, getCellValue(cell));
break;
case "class java.lang.Integer":
field.set(t, (int) cell.getNumericCellValue());
break;
case "int":
field.set(t, (int) cell.getNumericCellValue());
break;
case "class java.lang.Boolean":
if("是".equals(getCellValue(cell))){
field.set(t, true);
}
else{
field.set(t, false);
}
break;
case "class java.util.Date":
SimpleDateFormat format = new SimpleDateFormat(dateFormat);
if (cell != null) {
if (cell.getCellType() == XSSFCell.CELL_TYPE_NUMERIC) {
String dateStr = format.format(cell.getDateCellValue());
field.set(t, format.parse(dateStr));
} else {
if (StringUtils.isBlank(cell.getStringCellValue())) {
field.set(t, null);
} else {
field.set(t, format.parse(cell.getStringCellValue()));
}
}
}
break;
default:
break;
}
}
}
result.add(t);
}
return result;
}
/**
* 获取单元格内容
*
* @param cell 单元格
* @return 单元格的值
*/
private Object getCellValue(XSSFCell cell) {
Object value = null;
if (cell != null) {
switch (cell.getCellType()) {
case XSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case XSSFCell.CELL_TYPE_NUMERIC:
DecimalFormat df = new DecimalFormat("0");
value = df.format(cell.getNumericCellValue()) + "";
break;
default:
}
}
return value;
}
/**
* 将列表转成文件流
*
* @param clazz
* @param ts
* @return
* @throws Exception
*/
public XSSFWorkbook listToExcel(Class<T> clazz, List<T> ts) throws Exception {
return this.listToExcel(clazz, ts, null);
}
/**
* 将列表转成文件流
*
* @param clazz
* @param ts
* @return
* @throws Exception
*/
public XSSFWorkbook listToExcel(Class<T> clazz, List<T> ts, String dataFormat) throws Exception {
return this.listToExcel(clazz, ts, null, dataFormat);
}
/**
* 将列表转成文件流
*
* @param clazz
* @param ts
* @param sheetName
* @return
* @throws Exception
*/
public XSSFWorkbook listToExcel(Class<T> clazz, List<T> ts, String sheetName, String dateFormat) throws Exception {
if (dateFormat == null) {
dateFormat = "yyyy-MM-dd HH:mm";
}
XSSFWorkbook workbook = new XSSFWorkbook();
this.createSheet(workbook, clazz, ts, (StringUtils.isBlank(sheetName)) ? "Sheet1" : sheetName, dateFormat, null, null);
return workbook;
}
/**
* 将列表转成文件流
*
* @param clazz
* @param ts
* @param sheetName
* @return
* @throws Exception
*/
public XSSFWorkbook listToExcel(Class<T> clazz, List<T> ts, String sheetName, String dateFormat, SelectData selectData, List<Integer> lockedCols) throws Exception {
if (dateFormat == null) {
dateFormat = "yyyy-MM-dd HH:mm";
}
XSSFWorkbook workbook = new XSSFWorkbook();
this.createSheet(workbook, clazz, ts, (StringUtils.isBlank(sheetName)) ? "Sheet1" : sheetName, dateFormat, selectData, lockedCols);
return workbook;
}
/**
* @param clazz
* @param headerMap 表头字段属性集合 key 字段 value 字段含义(需有序)
* @param ts
* @param sheetName
* @return
* @throws Exception
*/
public XSSFWorkbook listToExcelByMap(Class<T> clazz, Map<String, String> headerMap, List<T> ts, String sheetName)
throws Exception {
XSSFWorkbook workbook = new XSSFWorkbook();
this.createSheetByMap(workbook, headerMap, ts, clazz, (StringUtils.isBlank(sheetName)) ? "Sheet1" : sheetName);
return workbook;
}
/**
* 创建Excel的Sheet
*
* @param workbook
* @param clazz
* @param data
* @param sheetName
* @param selectData 下拉值
* @param lockedCols 锁定的列
* @throws Exception
*/
private void createSheet(XSSFWorkbook workbook, Class clazz, List data, String sheetName, String dateFormat, SelectData selectData, List<Integer> lockedCols)
throws Exception {
Field[] fields = clazz.getDeclaredFields();
Map<String, String> columnInfos = new LinkedHashMap<>();
//设置表头
XSSFSheet sheet = workbook.createSheet(sheetName);
XSSFRow headRow = sheet.createRow(0);
for (int i = 0; i < fields.length; i++) {
ColumnName cn = fields[i].getAnnotation(ColumnName.class);
if (cn != null) {
XSSFCell cell = headRow.createCell(i);
sheet.setColumnWidth(i, 5000);
//用easyExcel设置表头
cell.setCellStyle(StyleUtil.buildDefaultCellStyle(workbook));
String fieldType = fields[i].getGenericType().toString();
cell.setCellValue(cn.value());
columnInfos.put(fields[i].getName(), fieldType);
}
}
//列的下拉选择赋值
if(selectData != null){
//生成下拉框
String[] datas = selectData.getDatas();
XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper.createExplicitListConstraint(datas);
CellRangeAddressList addressList = new CellRangeAddressList(selectData.getFirstRow(), selectData.getLastRow(), selectData.getFirstCol(), selectData.getLastCol());
XSSFDataValidation validation = (XSSFDataValidation) dvHelper.createValidation(
dvConstraint, addressList);
sheet.addValidationData(validation);
}
sheet.protectSheet("111");
//XSSFCellStyle bodyStyle = workbook.createCellStyle();
XSSFCellStyle lockStyle = workbook.createCellStyle();
lockStyle.setLocked(true);
//单元格不锁定的样式
XSSFCellStyle unlockStyle = workbook.createCellStyle();
unlockStyle.setLocked(false);
//bodyStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置内容
for (int i = 0; i < data.size(); i++) {
XSSFRow row = sheet.createRow(i + 1);
int j = 0;
for (Map.Entry<String, String> entry2 : columnInfos.entrySet()) {
String columnName = entry2.getKey();
String methodName = "get" + columnName.substring(0, 1).toUpperCase() + columnName.substring(1);
Method method = clazz.getDeclaredMethod(methodName);
Object value = method.invoke(data.get(i));
XSSFCell cell = row.createCell(j);
//判断是否要锁定列
if(lockedCols != null && lockedCols.contains(j)){
cell.setCellStyle(lockStyle);
}else{
cell.setCellStyle(unlockStyle);
}
j++;
if (value != null) {
switch (entry2.getValue()) {
case "class java.lang.String":
cell.setCellValue((String) value);
break;
case "int":
cell.setCellValue((int) value);
break;
case "class java.lang.Integer":
cell.setCellValue((int) value);
break;
case "class java.lang.Boolean":
cell.setCellValue((boolean) value);
break;
case "class java.util.Date":
//SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
cell.setCellValue(sdf.format((Date) value));
break;
default:
}
} else {
cell.setCellValue("");
}
}
}
}
/**
* 创建Excel的Sheet
*
* @param workbook
* @param headerMap 表头字段属性集合 key 字段 value 字段含义(需有序)
* @param data
* @param clazz
* @param sheetName
* @throws Exception boolean类型注意封装时的get/set方法
*/
private void createSheetByMap(XSSFWorkbook workbook, Map<String, String> headerMap, List data, Class clazz,
String sheetName) throws Exception {
//样式
XSSFFont font = workbook.createFont();
//font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setColor(HSSFColor.BLUE.index);
XSSFCellStyle headStyle = workbook.createCellStyle();
headStyle.setFont(font);
//headStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置表头
XSSFSheet sheet = workbook.createSheet(sheetName);
XSSFRow headRow = sheet.createRow(0);
int headerIdx = 0;
for (Map.Entry<String, String> headerEntry : headerMap.entrySet()) {
XSSFCell cell = headRow.createCell(headerIdx);
cell.setCellType(XSSFCell.CELL_TYPE_STRING);
sheet.setColumnWidth(headerIdx, 5000);
cell.setCellStyle(headStyle);
cell.setCellValue(headerEntry.getValue());
headerIdx++;
}
XSSFCellStyle bodyStyle = workbook.createCellStyle();
//bodyStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置内容
XSSFRow dataRow;
Field field;
Method method;
XSSFCell cell;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < data.size(); i++) {
dataRow = sheet.createRow(i + 1);
int j = 0;
for (Map.Entry<String, String> headerEntry : headerMap.entrySet()) {
field = clazz.getDeclaredField(headerEntry.getKey());
sb.append("get").append(field.getName().substring(0, 1).toUpperCase())
.append(field.getName().substring(1));
method = clazz.getDeclaredMethod(sb.toString());
sb.delete(0, sb.length());
Object value = method.invoke(data.get(i));
cell = dataRow.createCell(j++);
cell.setCellStyle(bodyStyle);
if (value != null) {
switch (field.getType().getName()) {
case "java.lang.String":
cell.setCellValue((String) value);
break;
case "int":
cell.setCellValue((int) value);
break;
case "java.lang.Integer":
cell.setCellValue((int) value);
break;
case "java.lang.Boolean":
cell.setCellValue((boolean) value);
break;
case "java.util.Date":
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
cell.setCellValue(sdf.format((Date) value));
break;
default:
}
} else {
cell.setCellValue("");
}
}
}
}
}demo
@GetMapping("/exportExcel")
public void exportExcel(HttpServletResponse response) throws Exception {
List<Person> list=new ArrayList<>();
Person p1=new Person("末日");
Person p2=new Person("神灵");
list.add(p1);
list.add(p2);
String[] datas = new String[] {"部门","科室","岗位 "};
SelectData selectData = new SelectData(datas, 1, 100, 0, 0);
XSSFWorkbook applicantExcel = poiExcelUtil.listToExcel(Person.class, list, "kongtest", "yyyy-MM-dd", selectData);
// 输出附件
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("下拉选择.xlsx", "UTF-8"));
OutputStream outStream = response.getOutputStream();
applicantExcel.write(outStream);
outStream.flush();
}
导入
Map<String,Object> result = excelUtil.readExcel(file, new Person(),1);
List<Person> excelImports = new ArrayList<>();
Boolean flag = (Boolean) result.get("flag");
Response response;
List<Object> list;
if(flag){
list = (List<Object>) result.get("datas");
if(list != null && list.size() > 0){
list = (List<Object>) result.get("datas");
}else{
return BaseUtil.createResponse(ReturnCode.ERROR, "", Arrays.asList(ReturnMessage.IMPORT_NULL));
}
}else{
return BaseUtil.createResponse(ReturnCode.ERROR, "", Arrays.asList(ReturnMessage.EXCEL_HEAD_ERROR));
}
原文作者：裂魂人1214
原文地址: https://blog.csdn.net/b422761838/article/details/103016850
本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
原文地址: https://blog.csdn.net/b422761838/article/details/103016850
本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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