使用Excel批量導入那咱們就得使用程序讀取Excel的內容
我們使用apache poi來操作excel
創建Excel
1、右鍵新建Excel(xls=2003 xlsx=2003以後) ----> new Excel對象
2、默認創建三個Sheet -----> createSheet
3、創建Row -----> createRow
4、創建Cell ----> createCell
5、填數據 ----> cell.setValue
6、點擊保存 -----> 用FileOutPutStream寫入文件
讀取Excel
1、雙擊打開excel ---->new Excel對象("文件路徑")
2、讀取sheet ----> getSheet("sheet名稱或者下標")
3、讀取行 -----> getRow("下標")
4、讀取cell --->getCell("下標")
5、讀取cell值 ---->getCellValue
6、x 掉excel --->關閉excel對象
使用文件上傳(Element)組件把excel上傳
POI
package com.zyf.utils;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
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;
public class POIUtils {
private final static String xls = "xls";
private final static String xlsx = "xlsx";
private final static String DATE_FORMAT = "yyyy/MM/dd";
/**
* 讀入excel文件,解析後返回
* @param file
* @throws IOException
*/
public static List<String[]> readExcel(MultipartFile file) throws IOException {
//檢查文件
checkFile(file);
//獲得Workbook工作薄對象
Workbook workbook = getWorkBook(file);
//創建返回對象,把每行中的值作爲一個數組,所有行作爲一個集合返回
List<String[]> list = new ArrayList<String[]>();
if(workbook != null){
for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
//獲得當前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(sheet == null){
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();
//循環除了第一行的所有行
for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
//獲得當前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//獲得當前行的開始列
int firstCellNum = row.getFirstCellNum();
//獲得當前行的列數
int lastCellNum = row.getPhysicalNumberOfCells();
String[] cells = new String[row.getPhysicalNumberOfCells()];
//循環當前行
for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
cells[cellNum] = getCellValue(cell);
}
list.add(cells);
}
}
workbook.close();
}
return list;
}
//校驗文件是否合法
public static void checkFile(MultipartFile file) throws IOException{
//判斷文件是否存在
if(null == file){
throw new FileNotFoundException("文件不存在!");
}
//獲得文件名
String fileName = file.getOriginalFilename();
//判斷文件是否是excel文件
if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
throw new IOException(fileName + "不是excel文件");
}
}
public static Workbook getWorkBook(MultipartFile file) {
//獲得文件名
String fileName = file.getOriginalFilename();
//創建Workbook工作薄對象,表示整個excel
Workbook workbook = null;
try {
//獲取excel文件的io流
InputStream is = file.getInputStream();
//根據文件後綴名不同(xls和xlsx)獲得不同的Workbook實現類對象
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;
}
public static String getCellValue(Cell cell){
String cellValue = "";
if(cell == null){
return cellValue;
}
//如果當前單元格內容爲日期類型,需要特殊處理
String dataFormatString = cell.getCellStyle().getDataFormatString();
if(dataFormatString.equals("m/d/yy")){
try {
cellValue = new SimpleDateFormat(DATE_FORMAT).format(cell.getDateCellValue());
return cellValue;
} catch (Exception e) {
}
}
//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);
}
//判斷數據的類型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //數字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING: //字符串
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 = "非法字符";
break;
default:
cellValue = "未知類型";
break;
}
return cellValue;
}
}
Controller層
/**
* Excel文件上傳,並解析文件內容保存到數據庫
* @param excelFile
* @return
*/
@RequestMapping("upload")
public Result upload(@RequestParam("excelFile")MultipartFile excelFile){
try {
//讀取文件
List<String[]> list = POIUtils.readExcel(excelFile);
if (list!=null&&list.size()>0){
List<OrderSetting> orderSettingList = new ArrayList<>();
for (String[] strings : list) {
/*OrderSetting orderSetting = new OrderSetting(new Date(strings[0]), Integer.parseInt(strings[1]));*/
//判斷數組數據是否完整
if (strings.length!=2){
continue;
}
String dateStr = strings[0];
int num =Integer.parseInt(strings[1]);
if (isNotEmpty(dateStr)&&isNotEmpty(num)){
OrderSetting orderSetting =new OrderSetting(DateUtil.parse(strings[0],"yyyy/MM/dd"),num);
orderSettingList.add(orderSetting);
}
}
orderSettingService.add(orderSettingList);
}
}catch (IOException e) {
e.printStackTrace();
return new Result(false, MessageConstant.IMPORT_ORDERSETTING_FAIL);
}
return new Result(true,MessageConstant.IMPORT_ORDERSETTING_SUCCESS);
}
private boolean isNotEmpty(Object o){
if (null==o){
return false;
}
if (o instanceof String ){
String o1 = (String) o;
if (o1.equals("")||o1.equals(" ")){
return false;
}
}
return true;
}