输出的文件层级关系如下:

主要功能代码如下:

@Override
	public void getZipData(Map<String, String> map, HttpServletResponse response) {

		OutputStream out = null;
		BufferedOutputStream bos = null;
		ZipOutputStream zos = null;
		FileInputStream is = null;
		BufferedInputStream bis = null;
		try {
			String filename = "最终的压缩包名称.zip";
			out = new FileOutputStream("c:/temp/" + filename);
			bos = new BufferedOutputStream(out);
			zos = new ZipOutputStream(bos);
			// 解决中文文件名乱码
			zos.setEncoding("GBK");

			
            // allList 每次循环是压缩包下的一个文件夹
			for (allList) {
				// 将每一个报销单中的所有附件放在同一个文件夹下面
				

				// 获取每个文件夹的名字
				String dirsName = "每个文件夹的名称";
                
                // 每个循环是一个文件夹中的文件
				for (atts) {
					String fdFileName = att.getFdFileName();
					if(StringUtil.isNull(fdFileName)){
						fdFileName = "文件名为空.zip";
					}
					InputStream inputStream = xxxx;
					File file = new File(fdFileName);
					inputStream2File(inputStream, file);

					is = new FileInputStream(file);
					bis = new BufferedInputStream(is);
					//会在压缩文件中建立名字为dirsName的文件夹,并在文件夹里创建文件
					zos.putNextEntry(new ZipEntry(dirsName + "/" + file.getName()));

					byte[] cache = new byte[1024];
					int nRead = 0;
					while ((nRead = bis.read(cache)) != -1) {
						zos.write(cache, 0, nRead);
					}
					zos.flush();
				}

			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			IOUtils.closeQuietly(bis);
			IOUtils.closeQuietly(is);
			try {
				if (zos != null) {
					zos.closeEntry();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			IOUtils.closeQuietly(zos);
			IOUtils.closeQuietly(bos);
			IOUtils.closeQuietly(out);
		}

	}


private static void inputStream2File (InputStream is, File file) throws IOException {
		OutputStream os = null;
		try {
			os = new FileOutputStream(file);
			int len = 0;
			byte[] buffer = new byte[8192];

			while ((len = is.read(buffer)) != -1) {
				os.write(buffer, 0, len);
			}
		} finally {
			os.close();
			is.close();
		}
	}

以上代码实现将文件打包下载到指定目录下, 如果需要下载到浏览器再添加如下代码:

通过浏览器下载:

public void downloadLaborReportData(HttpServletResponse response) {
		String zipFileName = "附件导出.zip";
		String fileUrl = "c:/temp/" + zipFileName;
		OutputStream out = null;
		FileInputStream fis = null;
		try {
			out = response.getOutputStream();
			File file = new File(fileUrl);
			fis = new FileInputStream(file);

			byte[] buffer = new byte[(int) file.length()];
			fis.read(buffer);
			fis.close();

			// 设置响应头
			response.setContentType("application/zip");
			response.setContentLength((int) file.length());
			response.setHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(zipFileName, "UTF-8"));
			out.write(buffer);
			out.flush();

			//删除服务器上的临时文件
			File deleteFile = new File(fileUrl);
			if (deleteFile.delete()) {
				logger.debug("临时文件" + zipFileName + "删除成功");
			} else {
				logger.debug("临时文件" + zipFileName + "删除失败");
			}

		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			IOUtils.closeQuietly(fis);
			IOUtils.closeQuietly(out);
		}
	}

以上便是基于java ZipOutputStream 下载多级.zip文件的全部内容了!

补充一下用法:

// 先下载到c:/temp临时位置
this.getZipData(conditionMap, response);

// 再从c:/temp读取下载到浏览器
this.downloadLaborReportData(response);