导出多个Excel文件并打包为压缩包下载

问题简述

之前系统里做的导出都是千篇一律的所有文件导在一个excel里，有现成的工具，现成的逻辑。

突然有那么一天，一切都不再现成了，我得把数据们导出为压缩包，一人一个Excel谁也不干涉谁。研究和参考了一下网上大神们的思路和逻辑以及代码，最后做出一版符合现有需求和现有系统的接口。希望能帮到需要的、同为初级菜菜的兄弟姐妹。水平有限不足之处望大家批评指正，批评使人进步，进步使人涨薪

先上导出效果（名字保密啦，大概就是这个熊样）

开始撸起袖子干

思路

1.先在工作路径的适当位置搞一个临时文件夹

2.把所有组装好的数据丢进去

3.打包这个临时文件夹并把.zip文件也放在临时文件夹下面

4.压缩包输出流，临时文件夹及其里所有东西删除掉

编写工具类

package com.gdj.ggfw.serv.web.rest.util.ExcelUtils;
import java.io.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.servlet.http.HttpServletResponse;
import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.TemplateExportParams;
import org.apache.poi.ss.usermodel.Workbook;public class ZipExportUtils {/*** 导出--使用easypoi，有模板* @param sheetList、、* @param templatePath* @param filename* @return*/public static String getExportResult(List<List<Map<String, Object>>> sheetList, String templatePath, String filename) throws IOException {// 加载模板TemplateExportParams params = new TemplateExportParams(templatePath, true);// 组装数据Map<String, Object> excelMap = new HashMap<>();for (int i = 0; i < sheetList.size(); i++) {String sheetname = "sheet" + (i + 1);List<Map<String, Object>> list = sheetList.get(i);excelMap.put(sheetname, list);}// easypoi方法--得到workbookWorkbook workbook = ExcelExportUtil.exportExcel(params, excelMap);// workBook写入fileFileOutputStream fileOutputStream = new FileOutputStream(filename);workbook.write(fileOutputStream);fileOutputStream.close();return "导出成功";}/*** 将多个Excel打包成zip文件* @param srcfile* @param zipfile*/public static void zipFiles(List<File> srcfile, File zipfile) {byte[] buf = new byte[1024];try {ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));for (int i = 0; i < srcfile.size(); i++) {File file = srcfile.get(i);FileInputStream in = new FileInputStream(file);out.putNextEntry(new ZipEntry(file.getName()));int len;while ((len = in.read(buf)) > 0) {out.write(buf, 0, len);}out.closeEntry();in.close();}out.close();} catch (IOException e) {e.printStackTrace();}}/*** 输出文件流以及关闭闭流;*/public static void closeFile(HttpServletResponse response,String serverPath, String str) {try {String path = serverPath +"/"+ str;File file = new File(path);if (file.exists()) {FileInputStream inputStream = null;try {inputStream = new FileInputStream(file);byte[] data = new byte[(int) file.length()];int length = inputStream.read(data);inputStream.close();response.setContentType("application/zip");OutputStream stream = response.getOutputStream();stream.write(data);stream.flush();stream.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}} else {response.sendRedirect("../error.jsp");}} catch (IOException e) {e.printStackTrace();}finally{File file1=new File(serverPath);// 删除临时目录deleteExcelPath(file1);}}/*** 删除目录下所有的文件;* @param file*/public static boolean deleteExcelPath(File file){String[] files = null;if(file != null){files = file.list();}if(file.isDirectory()){for(int i = 0; i < files.length; i ++){boolean bol = deleteExcelPath(new File(file,files[i]));if(bol){System.out.println("删除成功!");}else{System.out.println("删除失败!");}}}return file.delete();}
}

控制层代码

     /*** 导出(压缩包)* @param response* @param ids* @return*/@PutMapping("/exportZip")@Timedpublic void exportProContractManagement(HttpServletResponse response , @RequestBody List<String> ids) throws IOException {// 加载模板String templatePath = "xxx/xxx.xls";// 设置下载excel的临时文件夹String dirId = UUID.randomUUID().toString();MultipartConfigFactory multipartConfigFactory = new MultipartConfigFactory();//获取程序当前路径（当前工作目录）String serverPath = System.getProperty("user.dir") + "/" + dirId;File fileTemp = new File(serverPath);if(!fileTemp.exists()){fileTemp.mkdirs();}multipartConfigFactory.setLocation(serverPath);multipartConfigFactory.createMultipartConfig();serverPath = serverPath.replace('\\', '/');// 声明一个集合，用来存放多个Excel文件路径及名称List<File> srcfile = new ArrayList<File>();// 得到路径下的文件，如果不存在创建文件夹File file = new File(serverPath);if (!file.exists()) {file.mkdir();}// 打印日志logger.debug("\n"+"临时路径---------------------------" + serverPath);// 组装数据List<List<Map<String, Object>>> sheetList = null;for(int i = 0 ; i < ids.size() ; i ++){// 单条数据查询（service层中获取数据并组装完成，此处不赘述）sheetList = managementService.exportProContractManagement(ids.get(i));if (sheetList.size() == 0) {// 删除临时路径（为防止报错后临时文件夹仍存在于工作目录，这里需要删除临时文件夹）boolean b = ZipExportUtils.deleteExcelPath(file);throw new BadRequestAlertException("请确认有可导出数据！", ENTITY_NAME, "NoExists");} else {// 设置每个Excel的名称String filename = serverPath + "/" +sheetList.get(0).get(0).get("contractName")+".xls";ZipExportUtils.getExportResult(sheetList, templatePath, filename);// 组装数据Map<String, Object> excelMap = new HashMap<>();String sheetname = "sheet"  + 1;excelMap.put(sheetname, sheetList);String encodedfileName = new String(filename.getBytes(), "UTF-8");// 存放到文件集合中srcfile.add(new File(encodedfileName));}}// 设置压缩包路径File zipfile = new File(serverPath + "/" + "单项目业绩" + ".zip");// 实现将多个excel打包成zip文件ZipExportUtils.zipFiles(srcfile, zipfile);// 打印日志logger.debug("\n"+"打包成功---------------------------" );// 实现将压缩包写入流中，并删除临时文件中的压缩包及文件ZipExportUtils.closeFile(response, serverPath, "单项目业绩" + ".zip");logger.debug("\n"+"压缩成功并删除临时文件---------------------------" );}