如何使用 GZIP DATA 向服务器发送 http 请求

Question

我有一个 json 文件，我将它作为 POST 发送到服务器，但它必须被压缩

我不知道该怎么做

我在这里找到了潜在的解决方案GZip POST request with HTTPClient in Java

但我不知道如何将他们在答案第二部分中使用的方法与我的 makeHttpRequest 方法合并（他们使用的是多部分实体，而我使用的是 urlencoded 实体）

编辑：这是我获取 jsonAsBytes 的方式

public static byte[] stringToGZIPByteArray (String string) {
    Log.d("string to be gzipped", string);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    GZIPOutputStream gzos = null;

    try {
        gzos = new GZIPOutputStream(baos);
        gzos.write(string.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (gzos != null) {
            try { 
                gzos.close();
                } catch (IOException ignore) {

                };
        }
    }

    return baos.toByteArray();
} // End of stringToGZIPByteArray

这是我使用该方法的地方

jsonParser.sendGzippedJSONviaHTTP(context, API.JSON_ACCEPT,    UtilityClass.stringToGZIPByteArray(jsonObject.toString()), context.getResources());

这是 sendGzippedJSONviaHTTP

public JSONObject sendGzippedJSONviaHTTP(Context context, String url, byte[] gzippedJSON, Resources res) {

    if (httpClient == null) {
        try {
            httpClient = new HttpClientBuilder().setConnectionTimeout(10000) 
                    .setSocketTimeout(60000) //
                    .setHttpPort(80)//
                    .setHttpsPort(443)//
                    .setCookieStore(new BasicCookieStore())//
                    .pinCertificates(res, R.raw.keystore, null) //
                    .build();
        } catch (CertificateException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    // Making HTTP request
    try {

        // request method is POST
        // defaultHttpClient

        HttpPost httpPost = new HttpPost(url);


        httpPost.setHeader("Content-Encoding", "gzip");
        httpPost.setHeader("Content-Type", "application/json");

        httpPost.setEntity(AndroidHttpClient.getCompressedEntity(gzippedJSON, context.getContentResolver()));


        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        inputStream = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        inputStream.close();
        reader.close();
        json = sb.toString();
    } catch (ClientProtocolException e1) {
        e1.printStackTrace();
    } catch (IOException e1) {
        e1.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }

    // try parse the string to a JSON object
    try {
        jsonObject = new JSONObject(json);
    } catch (JSONException e) {
        e.printStackTrace();
    }

    // return JSON String
    return jsonObject;

} // End of makeHttpRequest

Answer 1

看看AndroidHttpClient。您可以使用它来代替 appache 的 DefaultHttpClient。它有一个静态方法getCompressedEntity(byte[] data, ContentResolver resolver)

所以，你可以写：

 HttpPost httpPost = new HttpPost(url);
 post.setEntity( AndroidHttpClient.getCompressedEntity( jsonAsBytes, null ) );
 httpClient.execute(httpPost);

更新：

这是来自AndroidHttpClient的代码：

public static AbstractHttpEntity getCompressedEntity(byte data[], ContentResolver resolver)
        throws IOException {
    AbstractHttpEntity entity;
    if (data.length < getMinGzipSize(resolver)) {
        entity = new ByteArrayEntity(data);
    } else {
        ByteArrayOutputStream arr = new ByteArrayOutputStream();
        OutputStream zipper = new GZIPOutputStream(arr);
        zipper.write(data);
        zipper.close();
        entity = new ByteArrayEntity(arr.toByteArray());
        entity.setContentEncoding("gzip");
    }
    return entity;
}

应该会给你一些见解