HttpURLConnection的HttpEntity替代方案

Question

由于Android开发人员删除了Apache HTTP Client，因此我将转向HttpURLConnection。我能够重写我所有的函数，只有一个除外。我正在发送带有名称和日期的字节数组(图像)。实际上，我的函数允许一次发送多张图像，但我只发送了一张。到目前为止，我一直使用MultipartEntityBuilder构建HttpEntity，并通过httpPost.setEntity(entity)设置它。然而，我想摆脱MultipartEntityBuilder。

现在我有以下代码片段：

public void sendImage(URL url, byte[] image, String name, long date) {
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setDoOutput(true);

    MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
    entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
    entityBuilder.addBinaryBody("file[]", image);
    entityBuilder.addTextBody("file_name[]", name);
    entityBuilder.addTextBody("file_size[]", String.valueOf(date));
    HttpEntity entity = entityBuilder.build();

    conn.addRequestProperty(entity.getContentType().getName(), entity.getContentType().getValue());

    OutputStream os = conn.getOutputStream();
    entity.writeTo(os);
    os.close();

    conn.connect();

    // read response code
}

在服务器端，我可以像这样接收数据：

$file = $_POST['file'];
$file_name = $_POST['file_name'];
$file_size = $_POST['file_size'];

我不能改变服务器实现。

我尝试了这个线程的解决方案：Sending files using POST with HttpURLConnection，但我不知道如何将其调整到我的服务器上。

有没有办法摆脱HttpEntity？我现在不想使用其他库(Volley，OkHttp或Retrofit)。我可能会在将来转到其中的一个。

谢谢你的帮助。

Answer 1

要将文件发送到服务器，您需要使用您可以编写的MultipartEntity类，如below.And所示，您可以将数据传递给它，如下所示。

AndroidMultiPartEntity entity = new AndroidMultiPartEntity();
File sourceFile = new File("yourpathhere");
entity.addPart("userfile", new FileBody(sourceFile));

您可以按如下方式编写服务器代码

 HttpClient httpclient = new DefaultHttpClient();
 HttpPost httppost = new HttpPost(targetURL);
 httppost.setEntity(entity);

 // Making server call
 HttpResponse responseObj = httpclient.execute(httppost);
 HttpEntity r_entity = responseObj.getEntity();

 int statusCode = responseObj.getStatusLine().getStatusCode();

 if (statusCode == 200) {
  // Server response
     response = EntityUtils.toString(r_entity);
 } else {
     response = "Error occurred! Http Status Code: "+ statusCode;
 }

MultipartEntityClass：

public class AndroidMultiPartEntity extends MultipartEntity

{

    //private final ProgressListener listener;

    public AndroidMultiPartEntity() {
        super();
        //this.listener = listener;
    }

    public AndroidMultiPartEntity(final HttpMultipartMode mode,
                                  final ProgressListener listener) {
        super(mode);
        //this.listener = listener;
    }

    public AndroidMultiPartEntity(HttpMultipartMode mode, final String boundary,
                                  final Charset charset, final ProgressListener listener) {
        super(mode, boundary, charset);
        //this.listener = listener;
    }

    @Override
    public void writeTo(final OutputStream outstream) throws IOException {
        super.writeTo(new CountingOutputStream(outstream));
    }

    public static interface ProgressListener {
        void transferred(long num);
    }

    public static class CountingOutputStream extends FilterOutputStream {

        //  private final ProgressListener listener;
        private long transferred;

        public CountingOutputStream(final OutputStream out) {
            super(out);
//  this.listener = listener;
            this.transferred = 0;
        }

        public void write(byte[] b, int off, int len) throws IOException {
            out.write(b, off, len);
            this.transferred += len;
            //this.listener.transferred(this.transferred);
        }

        public void write(int b) throws IOException {
            out.write(b);
            this.transferred++;
            //this.listener.transferred(this.transferred);
        }
    }
}