利用ant的ZipOutputStream进行文件合成zip进行下载

直接看代码

　　　　　List<Map<String, String>> filePaths = new ArrayList<>();
        for (LegislativePlanDraftFile legislativePlanDraftFile : list) {
            Map<String, String> map = new HashMap<>();
            map.put("filePath", legislativePlanDraftFile.getFilePath());
            map.put("fileName", legislativePlanDraftFile.getFileName());

            filePaths.add(map);
        }
        String zipName = "附件" + ".zip";
        String zipPath = "/ms-files/" + format.format(new Date()) + "/" + zipName;
//        String zipPath = "F:\\base-log\\" + zipName;  // 自己项目保存文件的位置
        CompressUtil.compress(filePaths, zipPath, false);
        File pocZipFile = new File(zipPath);
        CompressUtil.downloadZip(response, zipName, pocZipFile);

 

 

 先把查询出来的文件路径存入map集合中，进行循环读取，在存入

工具类

/**

/**
 * zip文件下载工具类
 */

public class CompressUtil {

    /**
     * 生成zip压缩文件
     * @param filePaths
     * @param zipFilePath
     * @param keepDirStructure
     */
    public static void compress(List<Map<String, String>> filePaths, String zipFilePath, Boolean keepDirStructure) {
        byte[] buf = new byte[1024];
        File zipFile = new File(zipFilePath);
        try {
            ZipOutputStream zos = new ZipOutputStream(Files.newOutputStream(zipFile.toPath()));
            zos.setEncoding("UTF-8"); // 有可能出现乱码的情况，手动设置编码格式
            for (int i = 0; i < filePaths.size(); i++) {
                String relativePath = filePaths.get(i).get("filePath");
                String relativeName = filePaths.get(i).get("fileName");
                if (StringUtils.isEmpty(relativePath)) {
                    continue;
                }
                File sourceFile = new File(relativePath);
                if (!sourceFile.exists()) {
                    continue;
                }
                FileInputStream fis = new FileInputStream(sourceFile);
                if (keepDirStructure != null && keepDirStructure) {
                    zos.putNextEntry(new ZipEntry(relativePath));
                } else {
                    zos.putNextEntry(new ZipEntry((i + 1) + "_" + relativeName));
                }
                int len;
                while ((len = fis.read(buf)) > 0) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
            }
            zos.close();
            if (!zipFile.exists()) {
                zipFile.createNewFile();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 下载zip
     *
     * @param response
     * @param zipName  浏览器header中zip名称
     * @param zipFile  zipFile文件
     */
    public static void downloadZip(HttpServletResponse response, String zipName, File zipFile) {
        //下载文件
        try {
　　　　　　　　// 设置自己需要的返回头信息，可以跟前端商量
            response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
            response.setHeader("Content-Disposition", "attachment; filename=" +
                    URLEncoder.encode(zipName, "UTF-8"));
            response.setHeader("Pragma", "no-cache");
            response.setHeader("Expires", "0");
            response.setHeader("Last-Modified", new Date().toString());
            response.setHeader("ETag", String.valueOf(System.currentTimeMillis()));
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/x-zip-compressed"); // 主要是返回的格式，要给到前端
            ServletOutputStream out = response.getOutputStream();
            int len = 0;
            byte[] buffer = new byte[1024];
            FileInputStream fis = new FileInputStream(zipFile);
            while ((len = fis.read(buffer)) > 0) {
                out.write(buffer, 0, len);
                out.flush();
            }
            out.close();
            fis.close();
            response.flushBuffer();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}