java导出excel，excel表头映射到javaBean属性名称（Date类型属性，按yyyy-MM-dd HH:mm:ss格式输出）
一、pom依赖
3.10-FINAL org.apache.poi poi ${org.apache.poi.version} org.apache.poi poi-ooxml ${org.apache.poi.version} org.apache.poi poi-ooxml-schemas ${org.apache.poi.version}
二、封装的服务
import cn.hutool.core.util.ObjectUtil;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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.Service;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
@Slf4j
@Service
public class ExcelExportService {
/**
* 导出excel
* @param excelDataList:需要导出的数据 List
* @param clazz 对应excelDataList具体类型的clazz(导出excel表头使用javaBean属性名)
* @param response
* @throws Exception
*/
public void exportExcel2003(List excelDataList, Class clazz, HttpServletResponse response) throws Exception {
List> excelTitles = getExcelTitleMaps(clazz);
List> rowDataList = new ArrayList<>();
for (Object obj : excelDataList) {
rowDataList.add(JSONObject.parseObject(JSON.toJSONString(obj), Map.class));
}
exportExcel2003(excelTitles, rowDataList, response);
}
/**
* 导出excel
* @param excelDataList:需要导出的数据 List
* @param clazz 对应excelDataList具体类型的clazz(导出excel表头使用javaBean属性名)
* @param response
* @throws Exception
*/
public void exportExcel2007(List excelDataList, Class clazz, HttpServletResponse response) throws Exception {
List> excelTitles = getExcelTitleMaps(clazz);
List> rowDataList = new ArrayList<>();
for (Object obj : excelDataList) {
rowDataList.add(JSONObject.parseObject(JSON.toJSONString(obj), Map.class));
}
exportExcel2007(excelTitles, rowDataList, response);
}
/**
* 导出Excel
* @param titles eg:[id, name, age]
* @param rowDataList eg:[{id:1,name:张三}]
* @param response
* @throws Exception
*/
private void exportExcel2003(List> titles, List> rowDataList, HttpServletResponse response) throws Exception {
HSSFWorkbook workbook = new HSSFWorkbook();
ServletOutputStream outputStream = null;
try {
String sheetName = "sheet1";
HSSFSheet sheet = workbook.createSheet(sheetName);
// 4.1表头
HSSFRow headRow = sheet.createRow(0);
for(int i = 0; i < titles.size(); i++){
Map map = titles.get(i);
headRow.createCell(i).setCellValue(getTitle(map));
}
for (Map currRowDataMap : rowDataList) {
HSSFRow dataRow = sheet.createRow(sheet.getLastRowNum() + 1); // 获取当前行
for(int i = 0; i < titles.size(); i++){
Map map = titles.get(i);
String title = getTitle(map);
Object obj = currRowDataMap.get(title);
if(ObjectUtil.isNotNull(obj)) {
String type = map.get(title);
if(ObjectUtil.equal(type, "java.lang.String")) {
dataRow.createCell(i).setCellValue(obj + "");
}else if(ObjectUtil.equal(type, "java.lang.Integer") ||
ObjectUtil.equal(type, "java.lang.Long") ||
ObjectUtil.equal(type, "java.math.BigDecimal") ||
ObjectUtil.equal(type, "java.lang.Float") ||
ObjectUtil.equal(type, "java.lang.Double") ||
ObjectUtil.equal(type, "java.lang.Number") ||
ObjectUtil.equal(type, "java.lang.Short") ||
ObjectUtil.equal(type, "java.lang.Byte")){
dataRow.createCell(i).setCellValue(String.valueOf(obj));
}else if(ObjectUtil.equal(type, "java.util.Date")) {
String formDateStr = DateUtil.getDateTime(new Date((long)obj));
dataRow.createCell(i).setCellValue(formDateStr);
}else{
dataRow.createCell(i).setCellValue(JSON.toJSONString(obj));
}
}
}
}
// 下载导出设置
// 设置头信息
String fileName = UUID.randomUUID().toString().replace("-", "") + ".xls";
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
outputStream = response.getOutputStream();
workbook.write(outputStream);
outputStream.flush();
} finally {
// 关闭
if(outputStream != null){
outputStream.close();
}
}
}
/**
* 导出Excel
* @param titles eg:[id, name, age]
* @param rowDataList eg:[{id:1,name:张三}]
* @param response
* @throws Exception
*/
private void exportExcel2007(List> titles, List> rowDataList, HttpServletResponse response) throws Exception {
XSSFWorkbook workbook = new XSSFWorkbook();
ServletOutputStream outputStream = null;
try {
String sheetName = "sheet1";
XSSFSheet sheet = workbook.createSheet(sheetName);
// 4.1表头
XSSFRow headRow = sheet.createRow(0);
for(int i = 0; i < titles.size(); i++){
Map map = titles.get(i);
headRow.createCell(i).setCellValue(getTitle(map));
}
for (Map currRowDataMap : rowDataList) {
XSSFRow dataRow = sheet.createRow(sheet.getLastRowNum() + 1); // 获取当前行
for(int i = 0; i < titles.size(); i++){
Map map = titles.get(i);
String title = getTitle(map);
Object obj = currRowDataMap.get(title);
if(ObjectUtil.isNotNull(obj)) {
String type = map.get(title);
if(ObjectUtil.equal(type, "java.lang.String")) {
dataRow.createCell(i).setCellValue(obj + "");
}else if(ObjectUtil.equal(type, "java.lang.Integer") ||
ObjectUtil.equal(type, "java.lang.Long") ||
ObjectUtil.equal(type, "java.math.BigDecimal") ||
ObjectUtil.equal(type, "java.lang.Float") ||
ObjectUtil.equal(type, "java.lang.Double") ||
ObjectUtil.equal(type, "java.lang.Number") ||
ObjectUtil.equal(type, "java.lang.Short") ||
ObjectUtil.equal(type, "java.lang.Byte")){
dataRow.createCell(i).setCellValue(String.valueOf(obj));
}else if(ObjectUtil.equal(type, "java.util.Date")) {
String formDateStr = DateUtil.getDateTime(new Date((long)obj));
dataRow.createCell(i).setCellValue(formDateStr);
}else{
dataRow.createCell(i).setCellValue(JSON.toJSONString(obj));
}
}
}
}
// 下载导出设置
// 设置头信息
String fileName = UUID.randomUUID().toString().replace("-", "") + ".xlsx";
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
outputStream = response.getOutputStream();
workbook.write(outputStream);
outputStream.flush();
} finally {
// 关闭
if(outputStream != null){
outputStream.close();
}
}
}
private String getTitle(Map map) {
for (String title : map.keySet()) {
return title;
}
return null;
}
private List> getExcelTitleMaps(Class clazz) {
Field[] declaredFields = clazz.getDeclaredFields();
List> titles = new ArrayList<>();
for (Field field : declaredFields) {
String name = field.getName();
if(ObjectUtil.notEqual(name, "serialVersionUID")) { // 剔除掉 serialVersionUID 属性
Map map = new HashMap<>();
map.put(name, field.getType().getTypeName());
titles.add(map);
}
}
return titles;
}
}
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateUtil {
public static String datetime = "yyyy-MM-dd HH:mm:ss";
public static String date_format = "yyyy-MM-dd";
/**
* 获取当前时间
*/
public static String getCurrentDateTime() {
SimpleDateFormat sdf = getDateFormat(datetime);
return sdf.format(new Date());
}
public static String getDateTime(Date date) {
if (date == null) {
return "";
}
SimpleDateFormat sdf = getDateFormat(datetime);
return sdf.format(date);
}
public static String getDate(Date date) {
if (date == null) {
return "";
}
SimpleDateFormat sdf = getDateFormat(date_format);
return sdf.format(date);
}
private static SimpleDateFormat getDateFormat(String parttern) throws RuntimeException {
return new SimpleDateFormat(parttern);
}
}
三、调用示例
public void exportExcel(HttpServletRequest request, HttpServletResponse response) {
// 获取需要导出的数据列表 需是javaBean的一个数据列表
List exportJavaBeans = xxxx；
// 导出excel2003
excelExportService.exportExcel2003(exportJavaBeans, ExportJavaBean.class, response);
// 导出excel2007
excelExportService.exportExcel2007(exportJavaBeans, ExportJavaBean.class, response);
}
四、此种导出excel有点
若存在Date类型的数据，会转成yyyy-MM-dd HH:mm:ss格式输出