请参阅我用于将视频上传到服务器的以下代码。但是,对于足够大的视频,我获得了OutOfMemory异常。
InputStream stream = getContentResolver().openInputStream(videoUri);
byte[] byteArray = IOUtils.toByteArray(stream);
RequestBody requestBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("file", "fname",
RequestBody.create(MediaType.parse("video/mp4"), byteArray))
.build();
Request request = new Request.Builder()
.url(uploadURL)
.post(requestBody)
.build();
OkHttpClient client = new OkHttpClient.Builder().build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
}
});
有人能指出我如何避免OutOfMemory异常的正确方向吗?有没有办法从InputStream转到requestBody?
答案 0 :(得分:4)
您可以创建用于流式传输数据的自定义div
。您将不得不小心:它可能会被多次重复使用,因为OkHttp可能会决定重试该请求。确保您每次都可以从头开始重新打开$('body').on({
'click': function() {
alert('clicked');
}
}, '.load-from-css');
。
RequestBody
答案 1 :(得分:3)
Uri
/ InputStream
/ AssetFileDescriptor
之一将 ContentResolver
转换为 ParcelFileDescriptor
okio.Source
(about source/sink) 创建 InputStream
Source
写入 Sink
,然后关闭 InputStream
如果您知道服务器期望什么为 contentType
,请对其进行硬编码。因为即使文件是 application/octet-stream
,服务器也可能只接受 video/mp4
。 Uri to contentType
检查Uri to contentLength,如果没有找到contentLength,则上传时不会附加Content-Length: X
标头。
/** It supports file/content/mediaStore/asset URIs. asset not tested */
fun createAssetFileDescriptor() = try {
contentResolver.openAssetFileDescriptor(this, "r")
} catch (e: FileNotFoundException) {
null
}
/** It supports file/content/mediaStore URIs. Will not work with providers that return sub-sections of files */
fun createParcelFileDescriptor() = try {
contentResolver.openFileDescriptor(this, "r")
} catch (e: FileNotFoundException) {
null
}
/** - It supports file/content/mediaStore/asset URIs. asset not tested
* - When file URI is used, may get contentLength error (expected x but got y) error when uploading if contentLength header is filled from assetFileDescriptor.length */
fun createInputStreamFromContentResolver() = try {
contentResolver.openInputStream(this)
} catch (e: FileNotFoundException) {
null
}
fun Uri.asRequestBody(contentResolver: ContentResolver,
contentType: MediaType? = null,
contentLength: Long = -1L)
: RequestBody {
return object : RequestBody() {
/** If null is given, it is binary for Streams */
override fun contentType() = contentType
/** 'chunked' transfer encoding will be used for big files when length not specified */
override fun contentLength() = contentLength
/** This may get called twice if HttpLoggingInterceptor is used */
override fun writeTo(sink: BufferedSink) {
val assetFileDescriptor = createAssetFileDescriptor()
if (assetFileDescriptor != null) {
// when InputStream is closed, it auto closes AssetFileDescriptor
AssetFileDescriptor.AutoCloseInputStream(assetFileDescriptor)
.source()
.use { source -> sink.writeAll(source) }
} else {
val inputStream = createInputStreamFromContentResolver()
if (inputStream != null) {
inputStream
.source()
.use { source -> sink.writeAll(source) }
} else {
val parcelFileDescriptor = createParcelFileDescriptor()
if (parcelFileDescriptor != null) {
// when InputStream is closed, it auto closes ParcelFileDescriptor
ParcelFileDescriptor.AutoCloseInputStream(parcelFileDescriptor)
.source()
.use { source -> sink.writeAll(source) }
} else {
throw IOException()
}
}
}
}
}
}
用法:
val request = uri.asRequestBody(
contentResolver = context.contentResolver,
contentType = "application/octet-stream".toMediaTypeOrNull(),
contentLength = uri.length(context.contentResolver)
)