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最近公司有个需求，需要点击一个按钮生成二维码，然后把二维码打包成zip文件，然后下载zip文件，于是我做了个demo，这里分享一下。
文件下载不能异步请求，因为我需要url后面动态拼接参数，所以这里用了button,具体前台代码如下可以实现下载（看压缩文件下载就可以了）：下载
后台主要分为这几个步骤：1生成二维码，2生成zip文件，3zip文件输出到输出流，4删除生成的文件。具体代码如下：
package com.mr.smart;import com.google.zxing.WriterException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;import java.net.URLEncoder;import java.util.Arrays;import java.util.List;@WebServlet(name = "ZipDownLoadServlet", value = "/zipDownLoadServlet")public class ZipDownLoadServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String realPath = request.getSession().getServletContext().getRealPath("/"); //1 生成二维码 String projectName = "农银公杂费"; String path = realPath + projectName; File file = new File(path); if (!file.exists()) { file.mkdirs(); } List list = Arrays.asList("code11.jpg", "code22.jpg", "code33.jpg");//已经存好的图片 try { for (String x : list) { String source = "G://" + x; String qrCode = path + "/公杂费_" + x; String url = "https://www.baidu.com/?name=" + x; QRCodeUtil.generateQRImage(url, qrCode, source);//生成二维码的方法 } } catch (WriterException e) { e.printStackTrace(); } //2 生成zip文件 ZipHelper.zipCompress(path, path + ".zip"); //3 下载 String zipFileName = path + ".zip"; String filename = projectName + ".zip"; //设置文件MIME类型 response.setContentType(getServletContext().getMimeType(filename)); response.setCharacterEncoding("UTF-8"); //设置Content-Disposition response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "utf-8")); InputStream in = new FileInputStream(zipFileName); OutputStream out = response.getOutputStream(); //写文件 int b; while ((b = in.read()) != -1) { out.write(b); } out.flush(); //4 删除多余文件 deleteDir(new File(path)); in.close();//先关闭输入流才能删除 deleteDir(new File(zipFileName)); out.close(); } private boolean deleteDir(File dir) { if (dir.isDirectory()) { String[] children = dir.list(); for (String s : children) { boolean success = deleteDir(new File(dir, s)); if (!success) { return false; } } } // 目录此时为空，可以删除 return dir.delete(); }} 中间用到了生成二维码的工具类，生成zip文件的工具类，具体代码见:
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