java下载压缩包文件zip

我不是女神ヾ 2022-06-12 10:20 340阅读 0赞

该案例从数据库查询出来数据，然后打包下载

@RequestMapping("/download")
    	public void download(UCFQRCodeRequestBO qrCodeRequestBO, HttpSession session, HttpServletResponse response) {
    		LOGGER.info("二维码下载，入参：" + JSON.toJSONString(qrCodeRequestBO));
    		ZipOutputStream zos = null;
    		try {
    			List<UCFQRCodeResponseBO> list = null;
    			if ("this".equals(qrCodeRequestBO.getBatchNo())) {
    				list = (List<UCFQRCodeResponseBO>) session.getAttribute(SUCCESS_DATA_SESSION);
    			} else {
    				FsResultBO<List<UCFQRCodeResponseBO>> fsResultBO = qrCodeService.searchQRCodeList(qrCodeRequestBO);
    				if (fsResultBO.isSuccess()) {
    					list = fsResultBO.getRespBO();
    				} else {
    					LOGGER.info("查询二维码信息列表失败！" + fsResultBO.getRespMsg());
    				}
    			}
    			LOGGER.info("下载数据信息：" + JSON.toJSON(list));
    			if (list != null && list.size() > 0 && list.size() <= 200) {
    				// 设置浏览器显示的内容类型为Zip
    				response.setContentType("application/zip");
    				// 设置内容作为附件下载，并且名字为：
    				SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
    				String fileName = sdf.format(new Date()) + ".zip";
    				response.setHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("GBK"), "ISO8859-1"));
    				// 装饰输出流为Zip输出流
    				zos = new ZipOutputStream(response.getOutputStream());
    				// 读取文件的缓存
    				for (UCFQRCodeResponseBO responseBO : list) {
    					String filePath = responseBO.getFilePath();
    					if (fileClient.existFile(filePath)) {
    						InputStream inputStream = fileClient.downloadFile(filePath);
    						// 把inputstream写入到zip流里
    						writeToZipFile(zos, inputStream, filePath);
    					} else {
    						LOGGER.info("二维码图片不存在！" + filePath);
    					}
    				}
    			}
    			session.removeAttribute(SUCCESS_DATA_SESSION);
    		} catch (Exception e) {
    			LOGGER.error("查询二维码信息列表异常！", e);
    		} finally {
    			if (zos != null) {
    				try {
    					zos.close(); // 最后要关闭流，否则使用RAR打开会提示“不可预料的压缩文件末端”
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    	}
    
    	/**
    	 * @Description: 把多个输入流的内容写到输出流里
    	 * @param zipOutput
    	 * @param inputStream
    	 * @param fileName
    	 */
    	private void writeToZipFile(ZipOutputStream zipOutput, InputStream inputStream, String fileName)
    			throws IOException {
    		BufferedInputStream bis = null;
    		try {
    			if (fileName.contains("/")) {
    				fileName = fileName.substring(fileName.lastIndexOf("/") + 1);
    			}
    			bis = new BufferedInputStream(inputStream);
    			ZipEntry entry = new ZipEntry(fileName);
    			zipOutput.putNextEntry(entry);
    			// 向压缩文件中输出数据
    			int length;
    			byte[] buffer = new byte[4096];
    			while ((length = bis.read(buffer)) != -1) {
    				zipOutput.write(buffer, 0, length);
    			}
    		} catch (IOException e) {
    			LOGGER.error("将图片文件写入压缩文件中出现异常：", e);
    		} finally {
    			if (zipOutput != null) {
    				zipOutput.flush();
    				zipOutput.closeEntry();
    			}
    			if (bis != null) {
    				bis.close();
    			}
    		}
    	}

参考：http://www.cnblogs.com/yzuzhang/p/4763606.html   里面还有另一种文件下载方式