使用Excel批量导入那咱们就得使用程序读取Excel的内容
我们使用apache poi来操作excel
创建Excel
1、右键新建Excel(xls=2003 xlsx=2003以后) ----> new Excel对象
2、默认创建三个Sheet -----> createSheet
3、创建Row -----> createRow
4、创建Cell ----> createCell
5、填数据 ----> cell.setValue
6、点击保存 -----> 用FileOutPutStream写入文件
读取Excel
1、双击打开excel ---->new Excel对象("文件路径")
2、读取sheet ----> getSheet("sheet名称或者下标")
3、读取行 -----> getRow("下标")
4、读取cell --->getCell("下标")
5、读取cell值 ---->getCellValue
6、x 掉excel --->关闭excel对象
使用文件上传(Element)组件把excel上传
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";
/**
* 读入excel文件,解析后返回
* @param file
* @throws IOException
*/
public static List<String[]> readExcel(MultipartFile file) throws IOException {
//检查文件
checkFile(file);
//获得Workbook工作薄对象
Workbook workbook = getWorkBook(file);
//创建返回对象,把每行中的值作为一个数组,所有行作为一个集合返回
List<String[]> list = new ArrayList<String[]>();
if(workbook != null){
for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
//获得当前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(sheet == null){
continue;
}
//获得当前sheet的开始行
int firstRowNum = sheet.getFirstRowNum();
//获得当前sheet的结束行
int lastRowNum = sheet.getLastRowNum();
//循环除了第一行的所有行
for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
//获得当前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//获得当前行的开始列
int firstCellNum = row.getFirstCellNum();
//获得当前行的列数
int lastCellNum = row.getPhysicalNumberOfCells();
String[] cells = new String[row.getPhysicalNumberOfCells()];
//循环当前行
for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
cells[cellNum] = getCellValue(cell);
}
list.add(cells);
}
}
workbook.close();
}
return list;
}
//校验文件是否合法
public static void checkFile(MultipartFile file) throws IOException{
//判断文件是否存在
if(null == file){
throw new FileNotFoundException("文件不存在!");
}
//获得文件名
String fileName = file.getOriginalFilename();
//判断文件是否是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) {
//获得文件名
String fileName = file.getOriginalFilename();
//创建Workbook工作薄对象,表示整个excel
Workbook workbook = null;
try {
//获取excel文件的io流
InputStream is = file.getInputStream();
//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
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;
}
//如果当前单元格内容为日期类型,需要特殊处理
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) {
}
}
//把数字当成String来读,避免出现1读成1.0的情况
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判断数据的类型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //数字
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 = "未知类型";
break;
}
return cellValue;
}
}
Controller层
/**
* Excel文件上传,并解析文件内容保存到数据库
* @param excelFile
* @return
*/
@RequestMapping("upload")
public Result upload(@RequestParam("excelFile")MultipartFile excelFile){
try {
//读取文件
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]));*/
//判断数组数据是否完整
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;
}