Java实现文件下载Zip压缩
目录
一、 概述
开发过程中碰到一个需求,需要将服务器上的多个文件打包为zip,并进行下载响应到客户端,写了一个Demo总结分享一下,如果有错误希望大家指正!
二、代码功能实现
这里实现只是模式本地文件下载Zip,响应的客户端下载
实现思路
- 创建一个临时文件zip
- 构建一个Zip文件输出流
- 从服务读取文件流放入Zip文件输出流
- 把临时文件Zip写入OutputStream
- 关闭资源
1. controller
- /**
- * 下载数据包
- *
- * @param response
- * @date: 2021/3/25 15:36
- * @return: void
- */
- @GetMapping("downloadDataZip")
- public void downloadDataZip(HttpServletResponse response) {
-
- String title = "报告源数据包.zip";
- File filePath = new File(FileUtil.getTemplatePath() + File.separator + title);
- List<String> srcFiles = Arrays.asList("20210113001.jpg", "20210113003.jpg", "20210113004.jpg", "瞳孔.txt");
- FileUtil.zipFiles(srcFiles, filePath);
- String filename = System.currentTimeMillis()+"_"+title;
- //设置文件路径
- if (filePath.exists()) {
- FileInputStream fis = null;
- BufferedInputStream bis = null;
- try {
- response.setContentType("application/octet-stream");
- response.setHeader("Content-disposition", "attachment; filename=" + new String(filename.getBytes("utf-8"), "ISO8859-1"));
- byte[] buffer = new byte[4096];
- fis = new FileInputStream(filePath);
- bis = new BufferedInputStream(fis);
- OutputStream os = response.getOutputStream();
- int i = bis.read(buffer);
- while (i != -1) {
- os.write(buffer, 0, i);
- i = bis.read(buffer);
- }
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- if (bis != null) {
- try {
- bis.close();
- // 删除临时文件
- filePath.delete();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- if (fis != null) {
- try {
- fis.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- }
2. FileUtil
-
- public class FileUtil {
-
-
-
- /**
- * 多图片压缩zip
- *
- * @param srcFiles 图片名称
- * @param zipFile 文件路径
- */
- public static void zipFiles(List<String> srcFiles, File zipFile) {
-
- // 判断压缩后的文件存在不,不存在则创建
- if (!zipFile.exists()) {
- try {
- zipFile.createNewFile();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- // 创建 FileOutputStream 对象
- FileOutputStream fileOutputStream ;
- // 创建 ZipOutputStream
- ZipOutputStream zipOutputStream ;
- // 创建 FileInputStream 对象
- BufferedInputStream bis = null;
-
- FileInputStream inputStream = null;
-
- try {
- // 实例化 FileOutputStream 对象
- fileOutputStream = new FileOutputStream(zipFile);
- // 实例化 ZipOutputStream 对象
- zipOutputStream = new ZipOutputStream(fileOutputStream);
- // 创建 ZipEntry 对象
- ZipEntry zipEntry ;
- // 遍历源文件数组
- for (String file : srcFiles) {
- // 将源文件数组中的当前文件读入 FileInputStream 流中
- String fileName = file;
- String localFileDir = "D:\\file\\video";
- fileName = URLDecoder.decode(fileName, "UTF-8");
- //获取文件输入流 localFileDir是服务端存储文件的路径
- File files = new File(localFileDir + File.separator + fileName);
- inputStream = new FileInputStream(files);
- // 文件后缀名称
- // 实例化 ZipEntry 对象,源文件数组中的当前文件
- zipEntry = new ZipEntry(fileName);
- zipOutputStream.putNextEntry(zipEntry);
- // 该变量记录每次真正读的字节个数
- int len;
- // 定义每次读取的字节数组
- byte[] buffer = new byte[4096];
- while ((len = inputStream.read(buffer)) > 0) {
- zipOutputStream.write(buffer, 0, len);
- }
-
- }
- zipOutputStream.closeEntry();
- zipOutputStream.close();
-
- fileOutputStream.close();
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- try {
- if (bis != null) {
- bis.close();
- }
- if (inputStream != null) {
- inputStream.close();
- }
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
-
- /**
- * 获取类路径
- * return 绝对路径地址
- */
- public static String getTemplatePath() {
- String realPath = FileUtil.class.getClassLoader().getResource("").getFile();
- File file = new File(realPath);
- realPath = file.getAbsolutePath();
- try {
- realPath = java.net.URLDecoder.decode(realPath, "utf-8");
- } catch (Exception e) {
- e.printStackTrace();
- }
- return realPath;
- }
-
- }
3. 前端页面
- <!DOCTYPE html>
- <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
- <head>
- <meta charset="UTF-8">
- <title>下载功能</title>
- <!-- <script th:src="@{/js/jquery-3.3.1.js}"></script>-->
- <script src="../static.js/jquery-3.3.1.js"></script>
- </head>
- <body>
-
- <div>
- <h3>下载文件测试</h3>
- <!-- <button type="submit" id="submit">上传</button>-->
- <a href="/order/sendUploadVoice" class="tab-down-button">下载1</a>
-
- <a href="/order/downloadUser" class="tab-down-button">下载2</a>
-
- <a href="/order/downloadDataZip" class="tab-down-button">报告源数据包</a>
- <button type="button" onclick="downloadzip()">按钮下载</button>
- <!--预览图片-->
- <div class="preview_box"></div>
- </div>
-
- <script type="text/javascript">
-
- function downloadzip(){
- window.location.href = "/order/downloadDataZip"
- };
-
- </script>
- </body>
- </html>
https://blog.csdn.net/zouliping123456/article/details/115211866 标签:文件,Java,String,Zip,压缩,File,new,null,bis From: https://www.cnblogs.com/sunny3158/p/16656236.html