CODEWITHSUNDEEP
javainputstream
Ree
Ree

Reputation: 6211

Reading lines from an InputStream without buffering

Does Java have a simple method to read a line from an InputStream without buffering? BufferedReader is not suitable for my needs because I need to transfer both text and binary data through the same connection repeatedly and buffering just gets in the way.

Upvotes: 7

Views: 3480

Answers (3)

AlikElzin-kilaka
AlikElzin-kilaka

Reputation: 36051

Eventually did it manually directly reading byte after byte from the InputStream without wrapping the InputStream. Everything I tried, like Scanner and InputStreamReader, reads ahead (buffers) the input :(

I guess I missed a some cases like \r.

public static String readLine(InputStream inputStream) throws IOException {
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    int c;
    for (c = inputStream.read(); c != '\n' && c != -1 ; c = inputStream.read()) {
        byteArrayOutputStream.write(c);
    }
    if (c == -1 && byteArrayOutputStream.size() == 0) {
        return null;
    }
    String line = byteArrayOutputStream.toString("UTF-8");
    return line;
}

Upvotes: 7

Tudor
Tudor

Reputation: 62469

You could try the Scanner class: http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html

However, this may buffer the input if no newline characters are present:

Since this method continues to search through the input looking for a line separator, it may buffer all of the input searching for the line to skip if no line separators are present.

Upvotes: 0

Hugh M Halford-Thompson
Hugh M Halford-Thompson

Reputation: 111

You may be better off reading the InputStream with a BufferedReader and appending the read lines to a String.

You can then manipulate the String as you wish without worrying about buffering.

Upvotes: -3

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