问题
I am using OKHTTP client for networking in my android application.
This example shows how to upload binary file. I would like to know how to get inputstream of binary file downloading with OKHTTP client.
Here is the listing of the example :
public class InputStreamRequestBody extends RequestBody {
private InputStream inputStream;
private MediaType mediaType;
public static RequestBody create(final MediaType mediaType,
final InputStream inputStream) {
return new InputStreamRequestBody(inputStream, mediaType);
}
private InputStreamRequestBody(InputStream inputStream, MediaType mediaType) {
this.inputStream = inputStream;
this.mediaType = mediaType;
}
@Override
public MediaType contentType() {
return mediaType;
}
@Override
public long contentLength() {
try {
return inputStream.available();
} catch (IOException e) {
return 0;
}
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
Source source = null;
try {
source = Okio.source(inputStream);
sink.writeAll(source);
} finally {
Util.closeQuietly(source);
}
}
}
Current code for simple get request is:
OkHttpClient client = new OkHttpClient();
request = new Request.Builder().url(\"URL string here\")
.addHeader(\"X-CSRFToken\", csrftoken)
.addHeader(\"Content-Type\", \"application/json\")
.build();
response = getClient().newCall(request).execute();
Now how do I convert the response to InputStream. Something similar to response from Apache HTTP Client like this for OkHttp response:
InputStream is = response.getEntity().getContent();
EDIT
Accepted answer from below. My modified code:
request = new Request.Builder().url(urlString).build();
response = getClient().newCall(request).execute();
InputStream is = response.body().byteStream();
BufferedInputStream input = new BufferedInputStream(is);
OutputStream output = new FileOutputStream(file);
byte[] data = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
回答1:
Getting ByteStream from OKHTTP
I've been digging around in the Documentation of OkHttp you need to go this way
use this method :
response.body().byteStream() wich will return an InputStream
so you can simply use a BufferedReader or any other alternative
OkHttpClient client = new OkHttpClient();
request = new Request.Builder().url("URL string here")
.addHeader("X-CSRFToken", csrftoken)
.addHeader("Content-Type", "application/json")
.build();
response = getClient().newCall(request).execute();
InputStream in = response.body().byteStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String result, line = reader.readLine();
result = line;
while((line = reader.readLine()) != null) {
result += line;
}
System.out.println(result);
response.body().close();
回答2:
For what it's worth, I would recommend response.body().source() from okio (since OkHttp is already supporting it natively) in order to enjoy an easier way to manipulate a large quantity of data that can come when downloading a file.
@Override
public void onResponse(Call call, Response response) throws IOException {
File downloadedFile = new File(context.getCacheDir(), filename);
BufferedSink sink = Okio.buffer(Okio.sink(downloadedFile));
sink.writeAll(response.body().source());
sink.close();
}
A couple of advantages taken from the documentation in comparison with InputStream:
This interface is functionally equivalent to InputStream. InputStream requires multiple layers when consumed data is heterogeneous: a DataInputStream for primitive values, a BufferedInputStream for buffering, and InputStreamReader for strings. This class uses BufferedSource for all of the above. Source avoids the impossible-to-implement available() method. Instead callers specify how many bytes they require.
Source omits the unsafe-to-compose mark and reset state that's tracked by InputStream; callers instead just buffer what they need.
When implementing a source, you need not worry about the single-byte read method that is awkward to implement efficiently and that returns one of 257 possible values.
And source has a stronger skip method: BufferedSource.skip(long) won't return prematurely.
回答3:
The best option to download (based on source code "okio")
private void download(@NonNull String url, @NonNull File destFile) throws IOException {
Request request = new Request.Builder().url(url).build();
Response response = okHttpClient.newCall(request).execute();
ResponseBody body = response.body();
long contentLength = body.contentLength();
BufferedSource source = body.source();
BufferedSink sink = Okio.buffer(Okio.sink(destFile));
Buffer sinkBuffer = sink.buffer();
long totalBytesRead = 0;
int bufferSize = 8 * 1024;
for (long bytesRead; (bytesRead = source.read(sinkBuffer, bufferSize)) != -1; ) {
sink.emit();
totalBytesRead += bytesRead;
int progress = (int) ((totalBytesRead * 100) / contentLength);
publishProgress(progress);
}
sink.flush();
sink.close();
source.close();
}
回答4:
This is how I use Okhttp + Okio libraries while publishing download progress after every chunk download:
public static final int DOWNLOAD_CHUNK_SIZE = 2048; //Same as Okio Segment.SIZE
try {
Request request = new Request.Builder().url(uri.toString()).build();
Response response = client.newCall(request).execute();
ResponseBody body = response.body();
long contentLength = body.contentLength();
BufferedSource source = body.source();
File file = new File(getDownloadPathFrom(uri));
BufferedSink sink = Okio.buffer(Okio.sink(file));
long totalRead = 0;
long read = 0;
while (read = (source.read(sink.buffer(), DOWNLOAD_CHUNK_SIZE)) != -1) {
totalRead += read;
int progress = (int) ((totalRead * 100) / contentLength);
publishProgress(progress);
}
sink.writeAll(source);
sink.flush();
sink.close();
publishProgress(FileInfo.FULL);
} catch (IOException e) {
publishProgress(FileInfo.CODE_DOWNLOAD_ERROR);
Logger.reportException(e);
}
回答5:
Better solution is to use OkHttpClient as:
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("http://publicobject.com/helloworld.txt")
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
// Headers responseHeaders = response.headers();
// for (int i = 0; i < responseHeaders.size(); i++) {
// System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
// }
// System.out.println(response.body().string());
InputStream in = response.body().byteStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String result, line = reader.readLine();
result = line;
while((line = reader.readLine()) != null) {
result += line;
}
System.out.println(result);
}
});
来源：https://stackoverflow.com/questions/25893030/download-binary-file-from-okhttp