java 文件流的处理 文件打包成zip
1、下载文件到本地
|
1
2
3
4
5
6
7
8
9
10
11
|
public void download(HttpServletResponse response){ String filePath ="";//文件路径 String fileName ="";//文件名称 // 读到流中 InputStream inStream = new FileInputStream(filePath); // 设置输出的格式 response.reset(); response.setContentType("bin"); response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); IOUtils.copy(inStream, response.getOutputStream());} |
2、java后端下载
方式一：
|
1
|
new URL(fileUrl + item.getcBhFileserver()).openStream() |
方法二：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
public Boolean addFile(String url, String id, String fileName) { RequestCallback requestCallBack = new RequestCallback() { @Override public void doWithRequest(ClientHttpRequest request) throws IOException { request.getHeaders().add("accept", MediaType.APPLICATION_OCTET_STREAM_VALUE); } }; ResponseExtractor<Boolean> responseExtractor = new ResponseExtractor<Boolean>() { @Override public Boolean extractData(ClientHttpResponse response) throws IOException { if (response.getStatusCode() == HttpStatus.OK) { //得到文件流 InputStream input = response.getBody(); return true; } return false; } }; return restTemplate.execute(url, HttpMethod.GET, requestCallBack, responseExtractor, id);} |
3、文件打包成zip
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
public void zipFilesAll() throws Exception { String zipPath = "";//zip包路径 String zipFileName = "";//zip包名称 File zipFile = new File(zipFileName .toString()); // 创建 FileOutputStream 对象 FileOutputStream fileOutputStream = null; // 创建 ZipOutputStream ZipOutputStream zipOutputStream = null; try { //创建文件夹 zipFile = new File(zipPath ); FileUtils.forceMkdir(zipFile); //创建文件 zipFile = new File(zipFileName .toString()); if (!zipFile.exists()) { zipFile.createNewFile(); } // 实例化 FileOutputStream 对象 fileOutputStream = new FileOutputStream(zipFileName.toString()); // 实例化 ZipOutputStream 对象 zipOutputStream = new ZipOutputStream(fileOutputStream); // 创建 ZipEntry 对象 ZipEntry zipEntry = null; for (CL cl: ClList) { // 实例化 ZipEntry 对象，源文件数组中的当前文件 zipEntry = new ZipEntry(tCltjjl.getcClmc() + ".zip"); zipOutputStream.putNextEntry(zipEntry); IOUtils.copy(new FileInputStream(cl.getcPath(), zipOutputStream); } } catch (Exception e) { }finally{ //记得删除文件 } } |
后台多文件打包成zip返回流 前台提供按钮一键下载
项目pom文件添加二维码操作，和文件打包的maven支持：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
<!--二维码相关 start--><dependency> <groupId>net.glxn.qrgen</groupId> <artifactId>javase</artifactId> <version>2.0</version></dependency><!--二维码相关 end--><!--文件打包相关 start--><dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-compress</artifactId> <version>1.12</version></dependency><!--文件打包相关 end--> |
前台代码：
|
1
|
<button type="button" onclick="downloadzip()">下载</button> |
js（我用了thymeleaf模板）代码：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
<script th:inline="javascript"> function downloadzip(){ var storeType = $("#storeType").val(); if(storeType ==""){ bootAlertError("请选择门店！"); return; } var url = [[@{/downLoadProductQrCode/getStreamZip}]]; //模拟form表单 返回打包流 var form = $('<form method= "POST" action="'+ url +'" enctyped="multipart/form-data">'+ '<input name= "agencyId" type= "hidden" value="'+storeType+'" />' +'</form>'); form. appendTo('body'). submit(). remove(); }</script> |
后台代码：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/** * @Author Ni Klaus * @Description //TODO 门店总代生成打包产品二维码zip * @Date 上午 10:38 2019/8/20 0020 * @Param [params,response] * @return void **/ @RequestMapping({"getStreamZip"}) @ResponseBody public void findList(@RequestParam Map params,HttpServletResponse response) throws Exception { String agencyId = (String) params.get("agencyId"); AgencyAccount agencyAccount = agencyAccountService.getAccountByAgencyId(agencyId); //这里设置打包后的zip文件名 String downloadName = agencyAccount.getName()+".zip"; try{ response.setContentType("multipart/form-data"); response.setHeader("Content-Disposition", "attachment;fileName=" + new String(downloadName.getBytes(),"ISO8859-1")); }catch(UnsupportedEncodingException e){ log.error("----------下载文件名编码时出现错误------"+e.getMessage()); } OutputStream outputStream = response.getOutputStream(); ZipArchiveOutputStream zous = new ZipArchiveOutputStream(outputStream); zous.setUseZip64(Zip64Mode.AsNeeded); zous.setEncoding("utf-8"); try{ //我这里是通过不同产品类型生成不同产品的二维码图片流 //具体你想生成什么类型的多个文件打包，只需要循环创建ArchiveEntry 然后zous.putArchiveEntry(entry)就可以了 StoreProductType[] storeProductTypes = StoreProductType.values(); for (StoreProductType storeProductType : storeProductTypes) { String url = "http://m.xxx.cn/goods/pay/xxx.html?productid="+storeProductType.getProductId() + "&agencycode="+ agencyId +"&channelid=def&appfrom=sqjk&isstore=1"; //打包文件里的每个文件的名字 String imgName = storeProductType.getDescription()+".png"; ByteArrayOutputStream out = QRCode.from(url).to(ImageType.PNG).withSize(300,300).stream(); byte[] bytes = out.toByteArray(); ArchiveEntry entry = new ZipArchiveEntry(imgName); zous.putArchiveEntry(entry); zous.write(bytes); zous.closeArchiveEntry(); if (out != null) { out.close(); } } }catch (Exception e){ e.printStackTrace(); log.error("---------------门店总代生成二维码打包流出错----------------"+e.getMessage()); }finally{ if(outputStream != null){ outputStream.close(); } if(zous != null){ zous.close(); } } } |
最后效果:
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/jiehanshi/p/11533465.html
