springboot 导出xlsx文件

 @Override
    public String downModelXlsFile(SxSourceReq param, HttpServletResponse response) {
　　　　　　//设置响应编码
        response.setCharacterEncoding("GBK");
        response.setContentType("multipart/form-data");
        ImModSourceVo imModSourceVo = findDetail(param);
        //ImModSourcePojo imModSourcePojo = imModSourcePojoMapper.get(param.getModSourceId());
        if (imModSourceVo == null) {
            return ReturnJsonFormatUntil.json(false, "该模板不存在！！！");
        }
        boolean isCustom = "2".equals(imModSourceVo.getModType());
        //List<ImModSourceSheetPojo> modSourceSheetPojos = imModSourceSheetPojoMapper.findList(param);
        if ((imModSourceVo.getList() == null || imModSourceVo.getList().size() == 0) && !isCustom) {
            return ReturnJsonFormatUntil.json(false, "该模板，没有sheet信息！！！");
        }
        if (!isCustom) {
            List<ImImpSourceSheetFactorPojo> factorPojoList = imImpSourceSheetFactorPojoMapper.findListBySheetIds(param);
            Map<String,List<ImImpSourceSheetFactorPojo>> sheetFactorListMap = factorPojoList.stream().collect(Collectors.groupingBy(ImImpSourceSheetFactorPojo::getModSourceSheetId));
            List<Map<String,Object>> sheetData = new ArrayList<>(imModSourceVo.getList().size());
            Map<String, Object> sheetMap = null;
            List<List<Map<String,Object>>> dataRowList = null;
            ImModSourceSheetVo sheetParam = new ImModSourceSheetVo();
            List<ImShowFactorColumnPojo> showFactorColumnPojos = getOrderImShowFactorColumnPojos(sheetParam);
            for (ImModSourceSheetVo imModSourceSheetVo:imModSourceVo.getList()) {
                sheetMap = new HashMap<>(3);
                sheetMap.put("sheetIndex",imModSourceSheetVo.getSheetIndex());
                sheetMap.put("sheetName",imModSourceSheetVo.getModSourceSheetName());
                List<ImModTableUnitVo> tableUnitIndexList = imModSourceSheetVo.getList();
                tableUnitIndexList.stream().sorted(Comparator.comparing(ImModTableUnitVo::getCoordinateY));
                dataRowList = new ArrayList<>(tableUnitIndexList.size()+1);
                List<Map<String,Object>> headers =  new ArrayList<>();
                List<ImModSourceSheetFactorVo> sheetFactorPojos = null;
                if (ObjectsUtil.isNotEmpty(imModSourceSheetVo.getFactorList())) {
                    sheetFactorPojos = imModSourceSheetVo.getFactorList();
                } else {
                    ListUtils.copyList(showFactorColumnPojos,sheetFactorPojos,ImModSourceSheetFactorVo.class);
                }
                sheetFactorPojos.stream().sorted(Comparator.comparing(ImImpSourceSheetFactorPojo::getOrderBy));

                Map<String,Object> header = null;
                Set<String> sortKeys = new HashSet<>();
                for (ImImpSourceSheetFactorPojo sheetFactorPojo : sheetFactorPojos) {
                    header = new HashMap<>(1);
                    header.put("value",sheetFactorPojo.getFactorPropertyName());
                    sortKeys.add(sheetFactorPojo.getFactorName());
                    headers.add(header);
                }
                dataRowList.add(headers);
/*                header.put("value","序号");
                headers.add(header);
                header = new HashMap<>(1);
                header.put("value","指标名称");
                headers.add(header);
                header = new HashMap<>(1);
                header.put("value","单位");
                headers.add(header);
                header = new HashMap<>(1);
                header.put("value","本期上报值");
                headers.add(header);
                header = new HashMap<>(1);
                header.put("value","备注说明");
                headers.add(header);*/
                List<Map<String,Object>> cellList =  null;
                Map<String,Object> cellMap = null;
                if (ObjectsUtil.isNotEmpty(imModSourceSheetVo.getList())) {
                    for (ImModTableUnitVo imModTableUnitVo : tableUnitIndexList) {
                        cellList = new ArrayList<>(5);
                        cellMap = new HashMap<>(1);
                        for (String sortKey : sortKeys) {
                            if ("indexName".equals(sortKey)) {
                                cellMap.put("value",imModTableUnitVo.getValue());
                            } else if ("indexUnit".equals(sortKey)) {
                                if (ObjectsUtil.isNotEmpty(imModTableUnitVo.getIndexVo())) {
                                    cellMap.put("value",imModTableUnitVo.getIndexVo().getIndexUnit());
                                } else {
                                    cellMap.put("value","");
                                }
                            } else {
                                cellMap.put("value","");
                            }
                            cellList.add(cellMap);
                        }
/*                    cellMap.put("value",serial);
                    cellList.add(cellMap);
                    cellMap = new HashMap<>(1);
                    cellMap.put("value",imModTableUnitIndexVo.getIndexName());
                    cellList.add(cellMap);
                    cellMap = new HashMap<>(1);
                    cellMap.put("value",imModTableUnitIndexVo.getIndexUnit());
                    cellList.add(cellMap);
                    cellMap = new HashMap<>(1);
                    cellMap.put("value","");
                    cellList.add(cellMap);
                    cellMap = new HashMap<>(1);
                    cellMap.put("value",imModTableUnitIndexVo.getDescription());
                    cellList.add(cellMap);*/
                        //serial++;
                        dataRowList.add(cellList);
                    }
                }
                sheetMap.put("data",dataRowList);
                sheetData.add(sheetMap);
            }
            String today = DateUtil.dateToStr(new Date());
            String dirPath = IReportUtils.saveXlsFileToLocal(today);

            //输出文件到本地
            String defaultFileName =  DateUtil.getStringAllDate() + ".xls";
            File file = new File(dirPath + "/" + defaultFileName);
            String path = dirPath + File.separator + defaultFileName;
            response.setHeader("Content-Disposition", "attachment;fileName=" + defaultFileName);
            ByteArrayOutputStream byteArrayOutputStream = null;
            try {
                OutputStream os = response.getOutputStream();
                log.info("导出开始!!!");
                //outputStream = new BufferedOutputStream(new FileOutputStream(file));
                byteArrayOutputStream = new ByteArrayOutputStream();
                //ExcelUtil.write2OutputStream(os,sheetData);
　　　　　　　　　　//写文件
                ExcelUtil.write2OutputStream(byteArrayOutputStream,sheetData);
                response.setContentLength(byteArrayOutputStream.size());
                ServletOutputStream outputStream = response.getOutputStream();
                byteArrayOutputStream.writeTo(outputStream);
                byteArrayOutputStream.close();
                outputStream.flush();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (byteArrayOutputStream != null) {
                    try {
                        byteArrayOutputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            log.info("下载文件成功");
            String results = ipAddress + path;
            log.info(results);
            return ReturnJsonFormatUntil.json(true, results);
        } else {
            if (ObjectsUtil.isEmpty(imModSourceVo.getFileId())) {
                return ReturnJsonFormatUntil.json(false, "没有该模板文件！！");
            }
            ImFilePojo pojo = imFilePojoMapper.get(imModSourceVo.getFileId());
            String filePath = "";
            if (ObjectUtils.isEmpty(pojo)) {
                log.error("查询的文件为空,不下载");
                return ReturnJsonFormatUntil.json(false, "该文件id错误,无该文件!!!");
            }
            log.info("开始下载文件到本地");
            String fileName = ObjectUtils.isEmpty(pojo.getFileName()) ? UuidUtils.uuid() : pojo.getFileName();
            String path = System.getProperty("user.dir");
            try {
                if(!FtpUtil.downloadFileJlf(1,response,
                        ftpConstants.getFTP_HOST_INDEX(),
                        ftpConstants.getFTP_PORT_INDEX(),
                        ftpConstants.getFTP_USER_INDEX(),
                        ftpConstants.getFTP_PASSWORD_INDEX(),
                        pojo.getFilePath(),
                        pojo.getFileName(),
                        "",
                        pojo.getFileName()
                )
                ){
                    return ReturnJsonFormatUntil.json(false, ResultConstants.DOWNLOAD_FALURE);
                }
                //下载路径
                //path = today + "_report/" + defaultFileName;
                log.info("导出成功!!!");
            } catch (Exception e) {
                log.error("下载失败+++++++++++++++" + fileName);
                log.error(e.getMessage());
                e.printStackTrace();
                return filePath;
            }
            log.info("下载文件成功");
            String results = ipAddress + path;
            log.info(results);
            return ReturnJsonFormatUntil.json(true, results);
        }
    }

首先开始设置响应格式

response.setCharacterEncoding("GBK");
response.setContentType("multipart/form-data");

然后设置响应文件名称

String today = DateUtil.dateToStr(new Date());
            String dirPath = IReportUtils.saveXlsFileToLocal(today);

            //输出文件到本地
            String defaultFileName =  DateUtil.getStringAllDate() + ".xls";
            File file = new File(dirPath + "/" + defaultFileName);
            String path = dirPath + File.separator + defaultFileName;
            response.setHeader("Content-Disposition", "attachment;fileName=" + defaultFileName);

导出文件到本地,并且把输出流写入给response

ByteArrayOutputStream byteArrayOutputStream = null;
            try {
                OutputStream os = response.getOutputStream();
                log.info("导出开始!!!");
                //outputStream = new BufferedOutputStream(new FileOutputStream(file));
                byteArrayOutputStream = new ByteArrayOutputStream();
                //ExcelUtil.write2OutputStream(os,sheetData);
                ExcelUtil.write2OutputStream(byteArrayOutputStream,sheetData);
                response.setContentLength(byteArrayOutputStream.size());
                ServletOutputStream outputStream = response.getOutputStream();
                byteArrayOutputStream.writeTo(outputStream);
                byteArrayOutputStream.close();
                outputStream.flush();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (byteArrayOutputStream != null) {
                    try {
                        byteArrayOutputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            log.info("下载文件成功");
            String results = ipAddress + path;
            log.info(results);

return ReturnJsonFormatUntil.json(true, results);

 ftp下载xlsx文件代码为

public  static boolean downloadFileJlf(int fileType, HttpServletResponse response, String host, int port, String username, String password, String remotePath,
                                        String fileName, String localPath,String saveAsFileName) {

        int count=0;

        FTPClient ftpClient = new FTPClient();
        ftpClient.setControlEncoding("GBK");
        response.setContentType("multipart/form-data");
        log.info(host + ":" + port + ":" + username + ":" + ":" + password + ":" + remotePath + ":" + fileName + ":" + localPath + ":" + saveAsFileName +":" + fileType);
//
//        FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
//        conf.setServerLanguageCode("zh");
//        ftpClient.configure(conf);
        String fileLastName="";

        try {
            int reply;
            ftpClient.connect(host, port);
            ftpClient.login(username, password);
            reply = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftpClient.disconnect();
                return false;
            }
           /* ftpClient.changeWorkingDirectory(remotePath);//转移到FTP服务器目录
            FTPFile[] fs = ftpClient.listFiles();
            for (int i = 0; i < fs.length; i++) {
                if (fs[i].getName().trim().equals(fileName)) {
                    if (fileType==1){
                        fileLastName=getFileNameNoEx(1,fs[i].getName());
                    }
                    saveAsFileName = new String(saveAsFileName.getBytes("GB2312"), "ISO-8859-1");
                    response.setHeader("Content-Disposition", "attachment;fileName=" + saveAsFileName);
                    OutputStream os = response.getOutputStream();
                    ftpClient.enterLocalPassiveMode();
                    ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
                    ftpClient.retrieveFile(fs[i].getName(), os);
                    os.flush();
                    os.close();
                    count++;
                    break;
                }
            }
*/
          // FTPFile[] files = ftpClient.listFiles(remotePath);
            saveAsFileName = new String(saveAsFileName.getBytes("GBK"), "ISO-8859-1");
            response.setHeader("Content-Disposition", "attachment;fileName=" + saveAsFileName);

            OutputStream os = response.getOutputStream();
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.retrieveFile(remotePath+"/"+fileName, os);
            os.flush();
            os.close();
            ftpClient.logout();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                    ioe.printStackTrace();
                    return false;
                }
            }
        }
       
        return true;
    }

由于xlsx文件比较特殊,如果还是下载失败,最后一种笨方法就是把文件下载到服务器本地,每天把文件放入指定文件夹,返回一个可以访问文件的路径,让用户从本地直接访问路径直接下载文件,第二天如果还有人下载文件,创建新文件夹,删除

昨天的旧文件夹即可,该方法只适用于下载文件比较少的情况,如果文件下载量太大,还是老老实实研究一下怎么下载xlsx文件吧!!!