ExcelUtil导出工具类

package com.ztw.common.util;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

@Component
public class ExcelUtil {

    private static String excelPath;

   /* @Value("${excelPath}")
    public void setExcelPath(String excelPath) {
        ExeclUtil.excelPath = excelPath;
    }*/

    public static void download(HttpServletRequest request, HttpServletResponse response, String title, Workbook workbook) throws IOException {
        String path = excelPath + "/ExcelData//" + title + ".xls";
        File file = new File(path);
        //判断目标文件所在的目录是否存在
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        FileOutputStream fos = new FileOutputStream(new File(path));
        workbook.write(fos);
        workbook.close();
        fos.close();
        response.setHeader("content-type", "application/octet-stream");
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment;filename=" + title + ".xls");
        byte[] buff = new byte[1024];
        BufferedInputStream bis = null;
        OutputStream os = null;
        try {
            os = response.getOutputStream();
            bis = new BufferedInputStream(new FileInputStream(new File(path)));
            int i = bis.read(buff);
            while (i != -1) {
                os.write(buff, 0, buff.length);
                os.flush();
                i = bis.read(buff);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println("success");

    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);

    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null){
            downLoadExcel(fileName, response, workbook);
        }
    }

    public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null){
            downLoadExcel(fileName, response, workbook);
        }
    }

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            System.out.println("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
        return list;
    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            System.out.println("excel文件不能为空");
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return list;
    }


    /**
     * 处理单元格格式的简单方式
     *
     * @param hssfCell
     * @return
     */
    public static String formatCell(Cell hssfCell) {
        if (hssfCell == null) {
            return "";
        } else {
            if (hssfCell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
                return String.valueOf(hssfCell.getBooleanCellValue());
            } else if (hssfCell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
                return String.valueOf(hssfCell.getNumericCellValue());
            } else {
                return String.valueOf(hssfCell.getStringCellValue());
            }
        }
    }

    /**
     * 处理单元格格式的第二种方式: 包括如何对单元格内容是日期的处理
     *
     * @param cell
     * @return
     */
    public static String formatCell2(HSSFCell cell) {
        if (cell.getCellType() == HSSFCell.CELL_TYPE_BOOLEAN) {
            return String.valueOf(cell.getBooleanCellValue());
        } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {

            //针对单元格式为日期格式  
            if (HSSFDateUtil.isCellDateFormatted(cell)) {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                return sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue())).toString();
            }
            return String.valueOf(cell.getNumericCellValue());
        } else {
            return cell.getStringCellValue();
        }
    }

    /**
     * 处理单元格格式的第三种方法:比较全面
     *
     * @param cell
     * @return
     */
    public static String formatCell3(HSSFCell cell) {
        if (cell == null) {
            return "";
        }
        switch (cell.getCellType()) {
            case HSSFCell.CELL_TYPE_NUMERIC:

                //日期格式的处理
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    return sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue())).toString();
                }

                return String.valueOf(cell.getNumericCellValue());

            //字符串  
            case HSSFCell.CELL_TYPE_STRING:
                return cell.getStringCellValue();

            // 公式  
            case HSSFCell.CELL_TYPE_FORMULA:
                return cell.getCellFormula();

            // 空白  
            case HSSFCell.CELL_TYPE_BLANK:
                return "";

            // 布尔取值  
            case HSSFCell.CELL_TYPE_BOOLEAN:
                return cell.getBooleanCellValue() + "";

            //错误类型  
            case HSSFCell.CELL_TYPE_ERROR:
                return cell.getErrorCellValue() + "";
        }

        return "";
    }
}