poi實現excel上傳下載 親自實踐 教你十分鐘搞定
今天要實現一個上傳excel的功能，之前寫過很多次，但是都沒有詳細整理過，今天整理下，方便以後直接拿來拷貝
首先從前臺來看，看了很多案例，基本兩種方法：一種是form表單提交，一種是非同步ajax方式。
在這裡我選擇ajax方式，因為我想要在前臺上傳完成後給使用者提示上傳成功還是失敗。
上jsp程式碼：
<div>
<input id="upfile" type="file" name="upfile" onchange="fileUpload();"/>
<button class="btn btn-info btn-fill btn-wd" id="btn" name="btn">上傳excel</button><button class="btn btn-info btn-fill btn-wd" onclick="downloadTemp();">下載模板</button>
</div>
接下來js:
<script type="text/javascript">
function downloadTemp(){
window.location.href="/4sinfo/downloadTmpl.do";
}
function fileUpload(){
var fileName = $("#upfile").val();
if(fileName == null || fileName==""){
alert("請選擇檔案");
}else{
var fileType = fileName.substr(fileName.length-4,fileName.length);
if(fileType == ".xls" || fileType == "xlsx"){
var formData = new FormData();
formData.append("file",$("#upfile").prop("files")[0]);
$.ajax({
type:"post",
url:"/4sinfo/ajaxUpload.do",
data:formData,
cache:false,
processData:false,
contentType:false,
dataType:"json",
success:function(data){
if(null != data){
if(data.dataStatus == "1"){
if(confirm("上傳成功！")){
window.location.reload();
}
}else{
alert("上傳失敗！");
}
}
},
error:function(){
alert("上傳失敗！");
}
});
}else{
alert("上傳檔案型別錯誤！");
}
}
}
</script>
接下來是工具類（此處是借鑑別人的，整理了下，還算比較整齊通用，哈哈）：
package com.antke.website.utils;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
import common.Logger;
public class POIUtils {
private static Logger logger = Logger.getLogger(POIUtils.class);
private final static String XLS = "xls";
private final static String XLSX = "xlsx";
public static List<String[]> readExcel(MultipartFile formFile) throws IOException{
//檢查檔案
checkFile(formFile);
//獲得工作簿物件
Workbook workbook = getWorkBook(formFile);
//建立返回物件，把每行中的值作為一個數組，所有的行作為一個集合返回
List<String[]> list = new ArrayList<>();
if(null!=workbook){
for(int sheetNum = 0;sheetNum<workbook.getNumberOfSheets();sheetNum++){
//獲取當前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(null == sheet){
continue;
}
//獲得當前sheet的開始行
int firstRowNum = sheet.getFirstRowNum();
//獲得當前sheet的結束行
int lastRowNum = sheet.getLastRowNum();
//迴圈除了第一行之外的所有行
for(int rowNum = firstRowNum+1;rowNum<=lastRowNum;rowNum++){
//獲得當前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//後的當前行的開始列
int firstCellNum = row.getFirstCellNum();
//獲得當前行的列數
int lastCellNum = row.getPhysicalNumberOfCells();
String[] cells = new String[row.getPhysicalNumberOfCells()];
//迴圈當前行
for(int cellNum = firstCellNum;cellNum < lastCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
cells[cellNum] = getCellValue(cell);
}
list.add(cells);
}
}
}
return list;
}
/**
* 獲取當前行資料
* @param cell
* @return
*/
@SuppressWarnings("deprecation")
private static String getCellValue(Cell cell){
String cellValue = "";
if(cell == null){
return cellValue;
}
//把數字當成String來讀，避免出現1讀成1.0的情況
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判斷資料的型別
switch(cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC://數字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING://字串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN://Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA://公式
cellValue = String.valueOf(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK://空值
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR://故障
cellValue = "非法字元";
break;
default:
cellValue = "未知型別";
break;
}
return cellValue;
}
/**
* 獲得工作簿物件
* @param formFile
* @return
*/
public static Workbook getWorkBook(MultipartFile formFile){
//獲得檔名
//String fileName = formFile.getName();
String fileName = formFile.getOriginalFilename();
//建立Workbook工作簿物件，表示整個excel
Workbook workbook = null;
try {
//獲得excel檔案的io流
InputStream is = formFile.getInputStream();
//根據檔案字尾名不同（xls和xlsx）獲得不同的workbook實現類物件
if(fileName.endsWith(XLS)){
//2003
workbook = new HSSFWorkbook(is);
}else if(fileName.endsWith(XLSX)){
//2007
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
e.printStackTrace();
}
return workbook;
}
/**
*檢查檔案
* @param formFile
* @throws IOException
*/
public static void checkFile(MultipartFile formFile) throws IOException{
//判斷檔案是否存在
if(null == formFile){
logger.error("檔案不存在！");
throw new FileNotFoundException("檔案不存在！");
}
//獲得檔名
//String fileName = formFile.getName();
String fileName = formFile.getOriginalFilename();
//判斷檔案是否是excel檔案
if(!fileName.endsWith(XLS) && !fileName.endsWith(XLSX)){
logger.error(fileName+"不是excel檔案！");
throw new IOException(fileName+"不是excel檔案！");
}
}
}
後臺action程式碼：
@RequestMapping("ajaxUpload.do")
@ResponseBody
public Map<String,Object> readExcel(@RequestParam(value = "file") MultipartFile excelFile,HttpServletRequest req,HttpServletResponse resp){
Map<String, Object> param = new HashMap<String, Object>();
// List<Car4SInfo> infoList = new ArrayList<Car4SInfo>();
try {
List<String[]> rowList = POIUtils.readExcel(excelFile);
for(int i=0;i<rowList.size();i++){
String[] row = rowList.get(i);
Car4SInfo info = new Car4SInfo();
info.setDealers(row[0]);
info.setProvince(row[1]);
info.setCity(row[2]);
info.setAddress(row[3]);
info.setPhone(row[4]);
info.setCar_model(row[5]);
service.insertCar4SInfo(info);
}
} catch (IOException e) {
e.printStackTrace();
}
param.put("dataStatus", 1);
return param;
}
/**
* 下載模板
* @param request
* @param response
*/
@RequestMapping("downloadTmpl.do")
public void downloadTmpl(HttpServletRequest request,HttpServletResponse response){
try {
String fileName = "car4sinfo.xlsx";
String path = request.getSession().getServletContext().getRealPath("/template/4sinfo")+"/"+fileName;
path = path.replace("\\", "/");
File file = new File(path);
String filename = file.getName();
// 取得檔案的字尾名。
String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
// 以流的形式下載檔案。
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 設定response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
搞定！！！！！