数据压缩下载

服务端生成数据（数据库查询结果）-> 生成文件，压缩成zip下载到本地

zip压缩文件上传

zip数据文件解析处理

文件zip压缩下载注意：

要为ZipEntry设置好size,不然会导致解析文件的时候出现zipEntry.getSize() 为 -1的问题。

下载部分：

    @GetMapping("/exportUserData/{catalog}")
    public void export(@PathVariable("catalog") String catalog,HttpServletResponse response) {
        List<User> data =  userService.queryUserByCatalog(catalog);
        byte[] file = JSON.toJSONString(data).getBytes();
        InputStream inputStream = new ByteArrayInputStream(file);
        // 设置相关格式
        response.setContentType("application/x-zip-compressed");
        // 设置下载后的文件名以及header
        response.addHeader("Content-disposition", "attachment;fileName=" + "user.zip");
        // 创建输出对象
        OutputStream os = response.getOutputStream();
        ZipOutputStream out = new ZipOutputStream(os);
        ZipEntry zipEntry = new ZipEntry("user.json");
        zipEntry.setSize(file.length);
        zipEntry.setMethod(ZipEntry.STORED);
        CRC32 crc = new CRC32();
        crc.reset();
        crc.update(file);
        zipEntry.setCrc(crc.getValue());
        out.putNextEntry(zipEntry);
        IOUtils.copy(inputStream, out);
        inputStream.close();
        out.closeEntry();
        out.close();
    }

上传处理部分：

    @PostMapping("/importUser/{catalog}")
    public Result<?> importUser(@RequestParam("file") MultipartFile file, @PathVariable("catalog") String catalog)
            throws IOException {

        if (file.isEmpty()) {
            return Result.ofFail(-1, "获取文件失败");
        }

        String filename = file.getOriginalFilename();
        if (!filename.endsWith("zip")) {
            return Result.ofFail(-1, "传入文件格式不是zip文件");
        }

        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(file.getBytes());
        ZipInputStream zipInputStream = new ZipInputStream(byteArrayInputStream);

        ZipEntry zipEntry = zipInputStream.getNextEntry();

        byte[] bytes = new byte[(int) zipEntry.getSize()];

        zipInputStream.read(bytes, 0, (int) zipEntry.getSize());

        String userJson = new String(bytes, StandardCharsets.UTF_8);

        userService.importUser(catalog, userJson);

        return Result.ofSuccess("导入成功");
    }