java--游戏后端--项目开发总结6--资源下载

1. 示例

    /**
     * 获取资源
     *
     * @param request  请求
     * @param response 响应
     */
    @RequestMapping("/getFile")
    public void getFile(HttpServletRequest request, HttpServletResponse response) {
        //请求信息
        String version = request.getParameter("version");
        String data = request.getParameter("data");
        String platform = request.getParameter("platform");

        //获取版本文件
        String xmlPath = "";
        try {
            File path = new File(ResourceUtils.getURL("classpath:").getPath());
            while (true) {
                File parentFile = path.getParentFile();
                if (parentFile.getParent().endsWith("mapleStoryBackstage")) {
                    xmlPath = parentFile.getParent() + "/assetBundles/" + platform + "/version.xml";
                    break;
                } else {
                    path = path.getParentFile();
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        //验证版本
        AssetBundleVersion serverAssetBundleVersion = appService.assetBundleVersionXmlDecode(new File(xmlPath));
        ConcurrentHashMap<String, AssetBundle> serverAssetBundleMap = serverAssetBundleVersion.getAssetBundleMap();
        List<String> assetBundleList = new ArrayList<>();
        if (StringUtils.isBlank(data)) {
            LogManger.info("首次更新资源");
            serverAssetBundleMap.values().forEach(assetBundle -> assetBundleList.add(assetBundle.getUrl()));
        } else if (version.equals(serverAssetBundleVersion.getVersion())) {
            LogManger.info("已是最新版");
            return;
        } else {
            //资源比对
            LogManger.info("增量更新资源");
            List<AssetBundle> assetBundleList1 = JSONArray.parseArray(data, AssetBundle.class);
            Map<String, AssetBundle> a = new ConcurrentHashMap<>();
            assetBundleList1.forEach(assetBundle -> {
                AssetBundle assetBundle1 = a.get(assetBundle.getName());
                if (null == assetBundle1) {
                    a.put(assetBundle.getName(), assetBundle);
                } else {
                    System.out.println(assetBundle.getName());
                }
            });

            Map<String, AssetBundle> clientAssetBundleMap = JSONArray.parseArray(data, AssetBundle.class).stream().collect(Collectors.toMap(AssetBundle::getName, (p) -> p));
            serverAssetBundleMap.forEach((key, value) -> {
                AssetBundle assetBundle = clientAssetBundleMap.get(key);
                if (null == assetBundle) {
                    assetBundleList.add(value.getUrl());
                } else {
                    if (!value.getMd5().equals(assetBundle.getMd5())) {
                        assetBundleList.add(value.getUrl());
                    }
                }
            });
        }

        //资源目录
        String destFileName = "assetBundle";
        String[] split = xmlPath.split("/");
        StringBuilder basePath = new StringBuilder();
        for (int i = 0; i < split.length - 1; i++) {
            basePath.append(split[i]).append("/");
        }

        //创建压缩文件
        FileOutputStream fileOutputStream;
        ZipOutputStream zipOutputStream;
        FileInputStream fileInputStream = null;
        File zipFile = new File(platform + "_" + destFileName + ".zip");
        try {
            fileOutputStream = new FileOutputStream(zipFile.getName());
            zipOutputStream = new ZipOutputStream(fileOutputStream);
            for (String path : assetBundleList) {
                addToZip(fileInputStream, basePath, zipOutputStream, path);
            }
            addToZip(fileInputStream, basePath, zipOutputStream, "WindowsPlayer");
            zipOutputStream.closeEntry();
            zipOutputStream.close();
            if (fileInputStream != null) {
                fileInputStream.close();
            }
            fileOutputStream.close();
            byte[] fileBytes = FileUtil.readFileToByteArray(zipFile);
            byte[] versionBytes = serverAssetBundleVersion.getVersion().getBytes();
            ByteBuf byteBuf = Unpooled.copiedBuffer(ByteUtil.int2Bytes(versionBytes.length), versionBytes, fileBytes);
            byte[] bytes = new byte[byteBuf.readableBytes()];
            byteBuf.readBytes(bytes);

            //通过response发送数据
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-disposition", "attachment; filename=" + platform + "_" + destFileName);
            response.setContentLength(bytes.length);
            response.setContentType("multipart/form-data");

            InputStream in = new ByteArrayInputStream(bytes);
            OutputStream out = response.getOutputStream();
            int b;
            byte[] bufferOut = new byte[1024];
            while ((b = in.read(bufferOut)) != -1) {
                out.write(bufferOut, 0, b);
            }
            out.close();
            in.close();

            zipFile.delete();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }