excel导入数据到数据库 文件上传通过流再上传到第三方服务器(含批量上传)

import com.alibaba.fastjson.JSON;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;


import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.*;

@Controller
public class MerchantUploadController {


    private final static String XLS = "xls";
    public static final String XLSX = "xlsx";

    @RequestMapping(value = "/upload/excel", method = RequestMethod.POST)
    public Json upload(MultipartFile file) {
        Workbook workbook = null;
        String fileName = file.getOriginalFilename();
        if (fileName.endsWith(XLS)) {
            try {
                workbook = new HSSFWorkbook(file.getInputStream());

            } catch (IOException e) {
                e.printStackTrace();
            }
        } else if (fileName.endsWith(XLSX)) {
            try {
                workbook = new XSSFWorkbook(file.getInputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            throw new BizException("文件不是Excel文件");
        }
        Sheet sheet = workbook.getSheet("sheet1");
        int rows = sheet.getLastRowNum();
        if (rows == 0) {
            throw new BizException("数据为空,请上传不为空的数据文档");
        }
        for (int i = 1; i <= rows + 1; i++) {
            Row row = sheet.getRow(i);
            if (row != null) {
                String rowOne = getCellValue(row.getCell(0));
                String rowTwo = getCellValue(row.getCell(1));
                String rowThree = getCellValue(row.getCell(2));
                Map obj = new HashMap();
                obj.put("bankCode", rowOne);
                obj.put("bankName", rowTwo);
                obj.put("bankFullName", rowThree);
                obj.put("createTime", DateUtil.getNow());
                Db.table("biz_system_bank").insert(obj);
            }
        }
        return json(BizUtils.SUCCESS_CODE, BizUtils.SUCCESS_MESSAGE);
    }


    public String getCellValue(Cell cell) {
        String value = "";
        if (cell != null) {
            switch (cell.getCellType()) {
                case HSSFCell.CELL_TYPE_NUMERIC:// 数字
                    value = cell.getNumericCellValue() + " ";
                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
                        Date date = cell.getDateCellValue();
                        if (date != null) {
                            value = new SimpleDateFormat("yyyy-MM-dd").format(date); //日期格式化
                        } else {
                            value = "";
                        }
                    } else {
                        value = new DecimalFormat("0").format(cell.getNumericCellValue());
                    }
                    break;
                case HSSFCell.CELL_TYPE_STRING: //  字符串
                    value = cell.getStringCellValue();
                    break;
                case HSSFCell.CELL_TYPE_BOOLEAN:   // Boolean类型
                    value = cell.getBooleanCellValue() + "";
                    break;
                case HSSFCell.CELL_TYPE_BLANK:   // 空值
                    value = "";
                    break;
                case HSSFCell.CELL_TYPE_ERROR: // 错误类型
                    value = "非法字符";
                    break;
                default:
                    value = "未知类型";
                    break;
            }

        }
        return value.trim();
    }

    @Value("${file.server.host}")
    private String fileHost;

    @RequestMapping(value = "/upload/file/list", method = RequestMethod.POST)
    public Json uploadList(@RequestParam(value = "file", required = false) MultipartFile[] file, HttpServletResponse response) {
        if (file.length <= 0) {
            throw new BizException("请上传图片");
        }
        List