java 文件流的处理 文件打包成zip
1、下载文件到本地
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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：
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new URL(fileUrl + item.getcBhFileserver()).openStream() |
方法二：
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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
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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：
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<!--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：
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< button type = "button" onclick = "downloadzip()" >下载</ button > |
js（我用了thymeleaf模板）代码：
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<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：
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/** * @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。
原文链接：https://www.cnblogs.com/jiehanshi/p/11533465.html
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