Spring boot OBS 华为云文件打包下载

原文地址：springboot 多文件打包下载_潇潇暮雨_H的博客-CSDN博客_springboot文件打包下载   可用

 

 

OBS文件打包下载

/**
 * 文件打包下载
 * @param response
 * @return
 * @throws Exception
 */
@RequestMapping("/packDown")
public String packDown(HttpServletResponse response) throws Exception {

    List files = new ArrayList();
    InputStream inputStream = hweiYunOBSService.fileDownload("b71268f1c92f456c96fa42f584594924.zip");
    InputStream inputStream1 = hweiYunOBSService.fileDownload("779cc2a36a67449fa92a3debedd75552.zip");
    files.add(inputStream);
    files.add(inputStream1);
    downLoadFiles(files, response);

    return "成功";
}

/**
 *
 * @param files List<File> 作为参数传进来，就是把多个文件的路径放到一个list里面
 * @param response
 * @return
 * @throws Exception
 */
public static HttpServletResponse downLoadFiles(List<File> files, HttpServletResponse response) throws Exception {

    try {
        // 临时文件夹 最好是放在服务器上，方法最后有删除临时文件的步骤
        String zipFilename = "D:/tempFile.zip";
        File file = new File(zipFilename);
        file.createNewFile();
        if (!file.exists()) {
            file.createNewFile();
        }
        response.reset();
        // response.getWriter()
        // 创建文件输出流
        FileOutputStream fous = new FileOutputStream(file);
        ZipOutputStream zipOut = new ZipOutputStream(fous);
        zipFile(files, zipOut);
        zipOut.close();
        fous.close();
        return downloadZip(file, response);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return response;
}

/**
 * 把接受的全部文件打成压缩包
 *
 */
public static void zipFile(List files, ZipOutputStream outputStream) {
    int size = files.size();
    for (int i = 0; i < size; i++) {
        InputStream file = (InputStream) files.get(i);
        zipFile(file, outputStream);
    }
}

/**
 * 根据输入的文件与输出流对文件进行打包
 *
 */
public static void zipFile(InputStream inputFile, ZipOutputStream ouputStream) {
    try {
                BufferedInputStream bins = new BufferedInputStream(inputFile, 512);
                ZipEntry entry = new ZipEntry(UUID.fastUUID()+".zip");
                ouputStream.putNextEntry(entry);
                // 向压缩文件中输出数据
                int nNumber;
                byte[] buffer = new byte[512];
                while ((nNumber = bins.read(buffer)) != -1) {
                    ouputStream.write(buffer, 0, nNumber);
                }
                // 关闭创建的流对象
                bins.close();
        inputFile.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static HttpServletResponse downloadZip(File file, HttpServletResponse response) {
    if (file.exists() == false) {
        System.out.println("待压缩的文件目录：" + file + "不存在.");
    } else {
        try {
            // 以流的形式下载文件。
            InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();

            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");

            // 如果输出的是中文名的文件，在此处就要用URLEncoder.encode方法进行处理
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + new String(file.getName().getBytes("GB2312"), "ISO8859-1"));
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            try {
                File f = new File(file.getPath());
                f.delete();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    return response;
}