No, you can’t. InputStream is designed to work with remote resources, so you can’t know if it’s there until you actually read from it. You may be able to use a java.io.PushbackInputStream, however, which allows you to read from the stream to see if there’s something there, and then “push it back” up the stream … Read more
Something like this should work. Note that for simplicity, I’ve used a Java 7 feature (try block with closeable resource), and IOUtils from Apache commons-io. If you can’t use those it’ll be a little longer, but the same idea. import org.apache.commons.io.IOUtils; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class StreamUtil { public static … Read more
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 … Read more
ClassLoader.getResourceAsStream(). As stated in the comment below, if you are in a multi-ClassLoader environment (such as unit testing, webapps, etc.) you may need to use Thread.currentThread().getContextClassLoader(). See http://stackoverflow.com/questions/2308188/getresourceasstream-vs-fileinputstream/2308388#comment21307593_2308388.
If you don’t want to copy all of the data into an in-memory buffer all at once then you’re going to have to have your code that uses the OutputStream (the producer) and the code that uses the InputStream (the consumer) either alternate in the same thread, or operate concurrently in two separate threads. Having … Read more
Update: This answer is precisely what the OP doesn’t want. Please read the other answers. For those cases when we don’t care about the data being re-materialized in memory, please use: new ByteArrayInputStream(str.getBytes(“UTF-8”))
An InputStream is the raw method of getting information from a resource. It grabs the data byte by byte without performing any kind of translation. If you are reading image data, or any binary file, this is the stream to use. A Reader is designed for character streams. If the information you are reading is … Read more
Solved my own problem. This line: BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream())); needs to be: BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), “UTF-8”)); or since Java 7: BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8));
This is a REALLY old thread, but it was still the first thing to pop up when I googled the issue. So I just wanted to add this: InputStream inputStream = conn.getInputStream(); int length = inputStream.available(); Worked for me. And MUCH simpler than the other answers here. Warning This solution does not provide reliable results … Read more