java解压缩Gzip JSON响应：StreamCorruptedException:无效流头：7B227061

Question

基本上，我试图通过解压gzip来获得对java中pojo的gzip编码json响应。首先，我从api调用中获得字节数组形式的响应

CategoriesFullDetails categoriesFullDetails = new CategoriesFullDetails();
        UriComponents getAllCategoriesUri = UriComponentsBuilder
                .fromHttpUrl(baseUrl + MENU_CATEGORY_FULL)
                .buildAndExpand(businessId);
        String getAllCategoriesUrl = getAllCategoriesUri.toUriString();
        HttpHeaders requestHeaders = new HttpHeaders();

        requestHeaders.set("Content-Type", "application/json");
        requestHeaders.set("Accept-Encoding", "gzip");

        HttpEntity httpEntity = new HttpEntity(requestHeaders);
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        client.setRequestFactory(requestFactory);
        client.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
        byte[] responseBytes = client
                .exchange(getAllCategoriesUrl, HttpMethod.GET, httpEntity, byte[].class).getBody();

一旦我将gzip响应转换并存储为如上所示的字节数组，我想对其进行解压缩，并将其添加到我的pojo中，即CategoriesFullDetails

下面我调用将解压缩字节数组的方法

            try {
                categoriesFullDetails = decompress(responseBytes);
                return categoriesFullDetails;
            } catch (ClassNotFoundException | IOException e) {
                e.printStackTrace();
                return  null;
            }

    public CategoriesFullDetails decompress(byte[] data) throws IOException, ClassNotFoundException {
        ByteArrayInputStream in = new ByteArrayInputStream(data);
        GZIPInputStream gis = new GZIPInputStream(in);
        ObjectInputStream is = new ObjectInputStream(gis);
        return (CategoriesFullDetails) is.readObject();
    }

所以我在调试这个解压方法时发现，它成功地将数据转换为ByteArrayInputStream，然后再转换为GZIPInputStream（方法的前两行工作正常）。但随后错误被抛出到ObjectInputStream is=new ObjectInputStream（gis） 正在说StreamCorruptedException:无效流头：7B227061

我希望有人能帮我解决这个问题，已经三天了，但我还是解决不了

Answer 1

7B227061是此ASCII的十六进制等价物：

{"pa

也就是说，它看起来像JSON数据的前4个字节。问题是，您有一个JSON文本的gzip流，并且将其传递给ObjectInputStream，后者用于读取序列化的Java对象数据

只需将gzip对象流传递给JSON解析器。或者，如果愿意，将整个输入流读入一个字符串，然后将该字符串传递给解析器

例如，如果你正在使用Jackson，那么：

ObjectMapper mapper = new ObjectMapper();
CategoriesFullDetails jsonMap = mapper.readValue(gis, CategoriesFullDetails.class);