CODEWITHSUNDEEP
javastringstream
Yossale
Yossale

Reputation: 14361

How do I turn a String into a InputStreamReader in java?

How can I transform a String value into an InputStreamReader?

Upvotes: 294

Views: 181872

Answers (6)

Guido
Guido

Reputation: 47675

ByteArrayInputStream also does the trick:

InputStream is = new ByteArrayInputStream( myString.getBytes( charset ) );

Then convert to reader:

InputStreamReader reader = new InputStreamReader(is);

Upvotes: 339

yegor256
yegor256

Reputation: 105043

You can try Cactoos:

InputStream stream = new InputStreamOf(str);

Then, if you need a Reader:

Reader reader = new ReaderOf(stream);

Upvotes: 2

Yossale
Yossale

Reputation: 14361

I also found the apache commons IOUtils class , so : 

InputStreamReader isr = new InputStreamReader(IOUtils.toInputStream(myString));

Upvotes: 64

Fai Ng
Fai Ng

Reputation: 790

Are you trying to get a) Reader functionality out of InputStreamReader, or b) InputStream functionality out of InputStreamReader? You won't get b). InputStreamReader is not an InputStream.

The purpose of InputStreamReader is to take an InputStream - a source of bytes - and decode the bytes to chars in the form of a Reader. You already have your data as chars (your original String). Encoding your String into bytes and decoding the bytes back to chars would be a redundant operation.

If you are trying to get a Reader out of your source, use StringReader.

If you are trying to get an InputStream (which only gives you bytes), use apache commons IOUtils.toInputStream(..) as suggested by other answers here.

Upvotes: 4

toolkit
toolkit

Reputation: 50227

Same question as @Dan - why not StringReader ?

If it has to be InputStreamReader, then:

String charset = ...; // your charset
byte[] bytes = string.getBytes(charset);
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
InputStreamReader isr = new InputStreamReader(bais);

Upvotes: 17

Dan Dyer
Dan Dyer

Reputation: 54465

Does it have to be specifically an InputStreamReader? How about using StringReader?

Otherwise, you could use StringBufferInputStream, but it's deprecated because of character conversion issues (which is why you should prefer StringReader).

Upvotes: 34

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