前后端分离项目后端向前端返回压缩包的方法实现java版

  //zip文件的下载
    @GetMapping("/zip/{imagePath}")
    @ResponseBody
    public void zip(HttpServletResponse response, @PathVariable(value = "imagePath", required = false) String imagePathList) throws IOException {
        String[] imagePaths = imagePathList.split(CCPCommon.CCP_SEPARATOR);
        //设置返回响应头
        response.reset();
        // 自动判断下载文件类型
        response.setContentType("multipart/form-data");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("picture.zip", "UTF-8"));

        FTPClient ftpClient;
        ftpClient = FtpUtil.getFTPClient("xxx", "xxx", "xxx", 21);
        // 中文支持
        ftpClient.setControlEncoding("UTF-8");
        ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
        ftpClient.enterLocalPassiveMode();
        ftpClient.changeWorkingDirectory("ftp://xxx");
        ZipOutputStream zos = null;
        OutputStream os = response.getOutputStream();
        try {
            zos = new ZipOutputStream(os);
            InputStream ins = null;
            for (String imagePath : imagePaths) {
                if (imagePath == null || imagePath.equals("") || imagePath.equals("undefined")) {//如果书没有上传
                    continue;
                }
                ins = ftpClient.retrieveFileStream(new String(imagePath.getBytes("UTF-8"), "iso-8859-1"));
                if (ins != null) {
                    zos.putNextEntry(new ZipEntry(imagePath));
                    int len;
                    byte[] buff = new byte[1024];
                    while (-1 != (len = ins.read(buff, 0, buff.length))) {
                        zos.write(buff, 0, len);
                    }
                    zos.closeEntry();
                    ins.close();
                    ftpClient.completePendingCommand();//不让一个循环后ftpClient自动关闭
                }
            }
            zos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

  //设置返回响应头
        response.reset();
        // 自动判断下载文件类型
        response.setContentType("multipart/form-data");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("picture.zip", "UTF-8"));

 ftpClient.completePendingCommand();