excel导出FileUtil工具类

柔光的暖阳◎ 2022-05-10 13:48 335阅读 0赞

package com.ziyun.pop.common.utils;
    
    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 com.foxinmy.weixin4j.util.StringUtil;
    import io.renren.common.exception.RRException;
    import org.apache.commons.lang3.StringUtils;
    import org.apache.poi.ss.usermodel.Workbook;
    import org.springframework.web.multipart.MultipartFile;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.File;
    import java.io.IOException;
    import java.net.URLEncoder;
    import java.util.List;
    import java.util.Map;
    import java.util.NoSuchElementException;
    
    public class FileUtil {
    
        public static final String[] EXCEL_EXT = {"xls","xlsx"};
    
        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));
        }
        /**
         * 一个excel 创建多个sheet
         * 
         * @param list 多个Map key title 对应表格Title key entity 对应表格对应实体 key data
         *            Collection 数据
         * @param fileName
         * @param response
         */
        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);
        }
    
        private 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) {
                throw new RRException(e.getMessage());
            }
        }
    
        /**
         * 一个excel 创建多个sheet
         * 
         * @param list 多个Map key title 对应表格Title key entity 对应表格对应实体 key data
         *            Collection 数据
         * @param fileName
         * @param response
         */
        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){
                throw new RRException("模板不能为空");
            } catch (Exception e) {
                e.printStackTrace();
                throw new RRException(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){
                throw new RRException("excel文件不能为空");
            } catch (Exception e) {
                throw new RRException(e.getMessage());
            }
            return list;
        }
    
        /**
         * 检查文件名是否符合要求
         * @param fileName 待监测文件名
         * @param exts 后缀名集合
         * @return
         */
        public static boolean checkExt(String fileName,String[] exts){
            if (StringUtil.isBlank(fileName))
                throw new RRException("待校验文件名不能为空");
            if (exts == null || exts.length == 0)
                throw new RRException("文件后缀名数组不能为空");
            String ext = fileName.substring(fileName.lastIndexOf(".")+1);
            for (int i = 0;i<exts.length;i++){
                if (ext.equals(exts[i])){
                    return true;
                }
            }
            return false;
        }
    
        public static void main(String[] args) {
    
    //        List<category> people = importExcel("F://students.xlsx",1,1,category.class);
    //        System.out.println(FastJsonUtils.toJSONString(people));
        }
    
    }