Java中的文件上传下载_技术笔记

690017359 2017-11-26

smartupload文件下载 response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment;filename=test.zip"); String path = "E:/Javajava/workspace for j2ee/Study2/WebContent/images"; String[] filenames = request.getParameterValues("filename"); String str = ""; ZipOutputStream zos = new ZipOutputStream(response.getOutputStream()); for (String filename : filenames) { File file = new File(path, filename); str += filename + " "; zos.putNextEntry(new ZipEntry(filename)); FileInputStream fis = new FileInputStream(file); byte b[] = new byte[1024]; int n = 0; while ((n = fis.read(b)) != -1) { zos.write(b, 0, n); } zos.flush(); fis.close(); } zos.setComment("download success" + " " + str); zos.flush(); zos.close();

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Zhq9695 2017-10-09

smartupload文件下载 response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment;filename=test.zip"); String path = "E:/Javajava/workspace for j2ee/Study2/WebContent/images"; String[] filenames = request.getParameterValues("filename"); String str = ""; ZipOutputStream zos = new ZipOutputStream(response.getOutputStream()); for (String filename : filenames) { File file = new File(path, filename); str += filename + " "; zos.putNextEntry(new ZipEntry(filename)); FileInputStream fis = new FileInputStream(file); byte b[] = new byte[1024]; int n = 0; while ((n = fis.read(b)) != -1) { zos.write(b, 0, n); } zos.flush(); fis.close(); } zos.setComment("download success" + " " + str); zos.flush(); zos.close();

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DR枫林残忆 2017-06-02

批量下载

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DR枫林残忆 2017-06-02

批量下载

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DR枫林残忆 2017-06-02

批量下载

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无心水2012 2016-12-07

批量下载-ZipOutputStream

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BeingTowards 2016-09-16

SmartUpload的批量下载：将多个文件打包成一个压缩包文件下载 setComment为压缩包里右边的注释说明

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为为_0002 2016-09-12

smartupload实现文件批量下载2

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为为_0002 2016-09-12

smartupload实现文件批量下载

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梦编猿 2016-07-28

Java中的文件上传下载——BatchDownloadServlet.java public class BatchDownloadServlet extends HttpServlet { public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("application/x-msdownload"); resp.setHeader("Content-Disposition", "attachment;filename=test.zip"); String path = getServletContext().getRealPath("/") + "images/"; String[] filenames = req.getParameterValues("filename"); String str = ""; String rt = "\r\n"; ZipOutputStream zos = new ZipOutputStream(resp.getOutputStream()); for(String filename : filenames){ str += filename + rt; File file = new File(path + filename); zos.putNextEntry(new ZipEntry(filename)); FileInputStream fis = new FileInputStream(file); byte b[] = new byte[1024]; int n = 0; while((n = fis.read(b)) != -1){ zos.write(b, 0, n); } zos.flush(); fis.close(); } zos.setComment("download success:" + rt + str); zos.flush(); zos.close(); } }

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梦编猿 2016-07-28

Java中的文件上传下载——SmartDownloadServlet.java public class SmartDownloadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String filename = request.getParameter("filename"); SmartUpload su = new SmartUpload(); su.initialize(getServletConfig(), request, response); su.setContentDisposition(null); try { su.downloadFile("/images/"+ filename); } catch (SmartUploadException e) { e.printStackTrace(); } } } 【温馨提示：JavaSE/EE、SSH/SSM、Hybrid APP、JQ/JS/CSS3/H5等编程爱好者关注我，加我慕课好友，互相学习，共同进步！】

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贫僧也是老衲 2016-07-28

设置文件下载

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zhuxc 2016-07-07

文件批量下载

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qq_颖_男人_03406653 2016-06-07

zos.setCmmont()在压缩文件中打出下载文件信息

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qq_颖_男人_03406653 2016-06-07

zos.putNextEntry(new ZipEntry(filename))设置文建条目

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庄学爸 2016-04-02

//通过循环,把文件写入到ZipOutputStream当中. for(String fileName:fileNames){ str+=fileName+rt; File file=new File(path+fileName); //通过ZipOutputStream的putNextEntry(ZipEntry e)方法设置需要压缩的文件条目.参数是ZipEntry对象,此类用于表示ZIP文件条目,条目:指按内容分列的细目. //文件条目即把文件加入到Zip压缩包里. ZipEntry类的构造方法参数是String类型. zipo.putNextEntry(new ZipEntry(fileName)); //创建输入流,从服务器端读取客户端需要下载的文件的内容,同时将内容通过ZipOutputStream输出流写入. FileInputStream inputStream=new FileInputStream(file); byte [] b=new byte[1024]; int n=0; while((n=inputStream.read(b))!=-1){ zipo.write(b, 0, n); } //刷新此输出流,关闭输入流 //zipo.flush(); inputStream.close(); } //ZipOutputStream的setComment(String comment)方法可以设置ZIP文件注释,下载打开压缩包时可以从右边看到该内容. zipo.setComment("download:success"+rt+str); //刷新输出流,不刷新结果也没什么影响. //zipo.flush(); //关闭输出流 zipo.close(); }

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庄学爸 2016-04-02

Servlet中: doPost(){ //首先设置contentType类型为下载类型 response.setContentType("application/x-msdownload"); //设置header信息,那么下载下来的zip压缩包名就为text.zip response.setHeader("Content-Disposition","attachment;filename=test.zip"); //获取服务器中保存需要下载文件的目录. String path=this.getServletContext().getRealPath("/")+"file/"; //获取表单提交需要下载的文件名数组(复选框). String [] fileNames=request.getParameterValues("filenames"); //创建ZipOutputStream对象,此类为以ZIP文件格式写入文件实现输出流过滤器.构造方法参数是OutPutStream对象,因此可以使用response.getOutPutStream作为参数. ZipOutputStream zipo=new ZipOutputStream(response.getOutputStream()); //该字符串用来设置Zip文件注释 String str=""; //定义换行符 String rt="\r\n";

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庄学爸 2016-04-02

在实际项目当中,想要实现文件批量下载,基本上都是通过打包的方式. 即假如下载10个文件,此时把这10个文件打包在一个zip的压缩包里. smartupload实现批量下载: jsp前台页面: <h2>批量下载:</h2>  <form action="batchDownLoad" method="post" > <input type="checkbox" name="filenames" value="a.txt"/>a.txt <input type="checkbox" name="filenames" value="b.txt"/>b.txt <input type="checkbox" name="filenames" value="c.txt"/>c.txt <input type="submit" value="确认"/> </form>

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庄学爸 2016-04-02

request.getInputStream()与response.getOutputStream()方法是为了在无法指定file对象时,可以通过此方法创建到输入/输出流.

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庄学爸 2016-04-02

getParameter()方法就是根据表单中的name值,获取该name值对应表单项的value属性值. getParameterValues();方法就是根据表单中的name值,获取该name值对应一组表单项的value属性值(用在复选框).

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ITLover 2016-03-17

下载时response头信息设置

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Godtrue 2016-03-05

文件批量下载的原理：将多个文件压缩成一个zip包下载。 public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("application/x-msdownload"); resp.setHeader("Content-Disposition", "attachment;filename=test.zip"); String path = getServletContext().getRealPath("/") + "images/"; String[] filenames = req.getParameterValues("filename"); String str = ""; String rt = "\r\n"; ZipOutputStream zos = new ZipOutputStream(resp.getOutputStream()); for(String filename : filenames){ str += filename + rt; File file = new File(path + filename); zos.putNextEntry(new ZipEntry(filename)); FileInputStream fis = new FileInputStream(file); byte b[] = new byte[1024]; int n = 0; while((n = fis.read(b)) != -1){ zos.write(b, 0, n); } zos.flush(); fis.close(); } zos.setComment("download success:" + rt + str); zos.flush(); zos.close(); }

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