java动态生成excel打包下载

    @SuppressWarnings("unchecked")
    public String batchExport() throws DBException{  

        @SuppressWarnings("unused")
        List chkList = this.checkValueToList();//获取复选框的值
        List srcfile=new ArrayList();  

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHSS");
        String path = sdf.format(new Date());  

        String serverPath = request.getSession().getServletContext().getRealPath("/");
        //在服务器端创建文件夹
        File file = new File(serverPath+path);
        if(!file.exists()){
            file.mkdir();
        }  

        for (int i = 0; i < chkList.size(); i++ ){
            String t[] = chkList.get(i).split("\\|");
            LhjcOrgSelfQuery lhjcunioncheckquery = new LhjcOrgSelfQuery();
            lhjcunioncheckquery.setChnoticeId(t[0]);
            lhjcunioncheckquery.setOrgId(t[1]);
            lhjcunioncheckquery.setSelfChTempId(t[2]);
            List> reportViews=commonService.getObjectPages("ExportLhjcunioncheckresultReportView", lhjcunioncheckquery);
            String orgName = (String)commonService.get2Object("getUnioncheckOrgName", t[1]);
            //生成excel的名字
            String templateName = nyear+"深圳市党政机关信息安全检查结果-"+(orgName==null?"未知单位":orgName);  

            String[] headArray = new String[]{"编码","检查项名称","   检查内容   ","考核类型","   检查结果   ","   备注   ","权重","得分"};  

            String[] fieldArray = new String[]{"CHECKITEMCODE","CHITEMNAME","CHCONTENT","REPORTTYPE","QUESTDESC","CHITEMDESC","REPORTWEIGHT","UNIONSCORE"};  

            ExportUtils exportUtils = new ExportUtils();
            exportUtils.setTitle(templateName);
            exportUtils.setHead(templateName);
            exportUtils.setHeadArray(headArray);
            exportUtils.setFieldArray(fieldArray);
            try {
                HttpServletResponse response = ServletActionContext.getResponse();  

                SimpleDateFormat sfm = new SimpleDateFormat("yyyy-MM-dd");
                String filename = templateName + "_" + sfm.format(new Date());  

                String encodedfileName = new String(filename.getBytes(), "GBK");
                //将生成的多个excel放到服务器的指定的文件夹中
                FileOutputStream out = new FileOutputStream(serverPath+path+"\"+encodedfileName+".xls");  

                if(fileType.indexOf(",") != -1){
                    fileType = StringUtils.substringBefore(fileType, ",");
                }
                response.setHeader("Content-Disposition", " filename="" + encodedfileName + "." + fileType + """);  

                //导出excel
                if ("xls".equals(fileType) || "xlsx".equals(fileType)) {
                    exportUtils.exportExcel(reportViews,fileType,out);
                } else if("doc".equals(fileType) || "docx".equals(fileType)){
                    exportUtils.exportWord(reportViews, fileType, out);
                } else if("pdf".equals(fileType)){
                    exportUtils.exportPdf(reportViews, out);
                }   

                srcfile.add(new File(serverPath+path+"\"+encodedfileName+".xls"));  

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        //将服务器上存放Excel的文件夹打成zip包
        File zipfile = new File(serverPath+path+".zip");
        this.zipFiles(srcfile, zipfile);
        //弹出下载框供用户下载
        this.downFile(ServletActionContext.getResponse(),serverPath, path+".zip");
        return null;
    }  

    public void zipFiles(List srcfile, File zipfile) {
        byte[] buf = new byte[1024];
        try {
            // Create the ZIP file
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));
            // Compress the files
            for (int i = 0; i < srcfile.size(); i++) {
                File file = srcfile.get(i);
                FileInputStream in = new FileInputStream(file);
                // Add ZIP entry to output stream.
                out.putNextEntry(new ZipEntry(file.getName()));
                // Transfer bytes from the file to the ZIP file
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                // Complete the entry
                out.closeEntry();
                in.close();
            }
            // Complete the ZIP file
            out.close();
        } catch (IOException e) {
           e.printStackTrace();
        }
    }    

    public void downFile(HttpServletResponse response,String serverPath, String str) {
        try {
            String path = serverPath + str;
            File file = new File(path);
            if (file.exists()) {
                InputStream ins = new FileInputStream(path);
                BufferedInputStream bins = new BufferedInputStream(ins);// 放到缓冲流里面
                OutputStream outs = response.getOutputStream();// 获取文件输出IO流
                BufferedOutputStream bouts = new BufferedOutputStream(outs);
                response.setContentType("application/x-download");// 设置response内容的类型
                response.setHeader(
                        "Content-disposition",
                        "attachment;filename="
                                + URLEncoder.encode(str, "GBK"));// 设置头部信息
                int bytesRead = 0;
                byte[] buffer = new byte[8192];
                 //开始向网络传输文件流
                while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {
                   bouts.write(buffer, 0, bytesRead);
               }
               bouts.flush();// 这里一定要调用flush()方法
                ins.close();
                bins.close();
                outs.close();
                bouts.close();
            } else {
                response.sendRedirect("../error.jsp");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }