java poi實現excel導入

解析excel的工具類

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.LinkedList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ImportExcel {

    /**
     * 對外提供讀取excel 的方法
     * */
    public static List<List<Object>> readExcel(File file) throws IOException {
        String fileName = file.getName();
        String extension = fileName.lastIndexOf(".") == -1 ? "" : fileName
                .substring(fileName.lastIndexOf(".") + 1);
        if ("xls".equals(extension)) {
            return read2003Excel(file);
        } else if ("xlsx".equals(extension)) {
            return read2007Excel(file);
        } else {
            throw new IOException("不支持的文件類型");
        }
    }

    /**
     * 讀取 office 2003 excel
     * 
     * @throws IOException
     * @throws FileNotFoundException
     */
    private static List<List<Object>> read2003Excel(File file) throws IOException {
        List<List<Object>> list = new LinkedList<List<Object>>();
        HSSFWorkbook hwb = new HSSFWorkbook(new FileInputStream(file));
        HSSFSheet sheet = hwb.getSheetAt(0);
        Object value = null;
        HSSFRow row = null;
        HSSFCell cell = null;
        int counter = 0;
        for (int i = sheet.getFirstRowNum(); counter < sheet
                .getPhysicalNumberOfRows(); i++) {
            row = sheet.getRow(i);
            if (row == null) {
                continue;
            } else {
                counter++;
            }
            List<Object> linked = new LinkedList<Object>();
            for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                cell = row.getCell(j);
                if (cell == null) {
                    continue;
                }
                DecimalFormat df = new DecimalFormat("0");// 格式化 number String
                                                            // 字符
                SimpleDateFormat sdf = new SimpleDateFormat(
                        "yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
                DecimalFormat nf = new DecimalFormat("0");// 格式化數字
                switch (cell.getCellType()) {
                case XSSFCell.CELL_TYPE_STRING:
                    value = cell.getStringCellValue();
                    break;
                case XSSFCell.CELL_TYPE_NUMERIC:
                    if ("@".equals(cell.getCellStyle().getDataFormatString())) {
                        value = df.format(cell.getNumericCellValue());
                    } else if ("General".equals(cell.getCellStyle()
                            .getDataFormatString())) {
                        value = nf.format(cell.getNumericCellValue());
                    } else {
                        value = sdf.format(HSSFDateUtil.getJavaDate(cell
                                .getNumericCellValue()));
                    }
                    break;
                case XSSFCell.CELL_TYPE_BOOLEAN:
                    value = cell.getBooleanCellValue();
                    break;
                case XSSFCell.CELL_TYPE_BLANK:
                    value = "";
                    break;
                default:
                    value = cell.toString();
                }
                if (value == null || "".equals(value)) {
                    continue;
                }
                linked.add(value);
            }
            list.add(linked);
        }
        return list;
    }

    /**
     * 讀取Office 2007 excel
     * */
    private static List<List<Object>> read2007Excel(File file) throws IOException {
        List<List<Object>> list = new LinkedList<List<Object>>();
        // 構造 XSSFWorkbook 對象，strPath 傳入文件路徑
        XSSFWorkbook xwb = new XSSFWorkbook(new FileInputStream(file));
        // 讀取第一章表格內容
        XSSFSheet sheet = xwb.getSheetAt(0);
        Object value = null;
        XSSFRow row = null;
        XSSFCell cell = null;
        int counter = 0;
        for (int i = sheet.getFirstRowNum(); counter < sheet
                .getPhysicalNumberOfRows(); i++) {
            row = sheet.getRow(i);
            if (row == null) {
                continue;
            } else {
                counter++;
            }
            List<Object> linked = new LinkedList<Object>();
            for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                cell = row.getCell(j);
                if (cell == null) {
                    continue;
                }
                DecimalFormat df = new DecimalFormat("0");// 格式化 number String
                                                            // 字符
                SimpleDateFormat sdf = new SimpleDateFormat(
                        "yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
                DecimalFormat nf = new DecimalFormat("0");// 格式化數字
                switch (cell.getCellType()) {
                case XSSFCell.CELL_TYPE_STRING:
                    value = cell.getStringCellValue();
                    break;
                case XSSFCell.CELL_TYPE_NUMERIC:
                    if ("@".equals(cell.getCellStyle().getDataFormatString())) {
                        value = df.format(cell.getNumericCellValue());
                    } else if ("General".equals(cell.getCellStyle()
                            .getDataFormatString())) {
                        value = nf.format(cell.getNumericCellValue());
                    } else {
                        value = sdf.format(HSSFDateUtil.getJavaDate(cell
                                .getNumericCellValue()));
                    }
                    break;
                case XSSFCell.CELL_TYPE_BOOLEAN:
                    value = cell.getBooleanCellValue();
                    break;
                case XSSFCell.CELL_TYPE_BLANK:
                    value = "";
                    break;
                default:
                    value = cell.toString();
                }
                if (value == null || "".equals(value)) {
                    continue;
                }
                linked.add(value);
            }
            list.add(linked);
        }
        return list;
    }

}

controller層接收前臺提交的excel文件並調用工具類工的readExcel方法對文件進行解析：

//通過Excel批量導入業務信息
    @ResponseBody
    @RequestMapping(value = "/import-bus", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public ResponseEntity<?> importBus(@RequestParam("file") MultipartFile file) throws IOException {

        // 判斷文件是否爲空
        if (!file.isEmpty()) {
            try {
                // 文件保存路徑
                /*String filePath = request.getSession().getServletContext().getRealPath("/") + 
                        "upload/" + file.getOriginalFilename();*/
                String filePath = file.getOriginalFilename();
                // 轉存文件
                file.transferTo(new File(filePath));
                List<List<Object>> list = ImportExcel.readExcel(new File(filePath));
                request.setAttribute("list", list);
                System.out.println(list);
                for (int i = 1; i < list.size(); i++) {
                    List<Object> list2 = list.get(i);
                    System.out.println(list2);
                    YwConfigVo ywConfigVo = new YwConfigVo();
                    ywConfigVo.setYwName(list2.get(0).toString());
                    ywConfigVo.setType(list2.get(1).toString());
                    ywConfigVo.setOperationStep(list2.get(2).toString());
                    ywConfigVo.setOperEntry(Long.parseLong(list2.get(3).toString()));
                    ywConfigVo.setOperExit(Long.parseLong(list2.get(4).toString()));
                    ywConfigVo.setExamine(list2.get(5).toString());
                    Long ywId = ywConfigService.findBusByName(ywConfigVo.getYwName());
                    if (ywId==null) {
                        ywConfigVo.setId(snowflake.next()); //添加ID
                        ywConfigService.addYwConfig(ywConfigVo);
                    }else{
                        ywConfigVo.setId(ywId);
                        ywConfigService.editYwConfig(ywConfigVo);
                    }
                }
            } catch (DemoException e){
                return ResponseUtil.responseError(e);
            }
        }
        return null;
    }

前臺jsp表單提交文件代碼：

<form action="fileUpload.html" method="post" enctype="multipart/form-data">
    選擇文件:<input type="file" name="file">
    <input type="submit" value="提交"> 
</form>