String and byte[] issue java

Question

I am converting a String to byte[] and then again byte[] to String in java using the getbytes() and String constructor,

String message = "Hello World";
byte[] message1 = message.getbytes();

using PipedInput/OutputStream I send this to another thread, where,

byte[] getit = new byte[1000];
pipedinputstream.read(getit);
print(new String(getit));

This last print result in 1000 to be printed... I want the actual string length. How can i do that?

what's the type of pipedinputstream?

Shine
– Shine

2012-05-14 09:28:52 +00:00
Commented May 14, 2012 at 9:28 — Shine
– Shine, Commented May 14, 2012 at 9:28
@Shine: make an educated guess :-)

Lukas Eder
– Lukas Eder

2012-05-14 09:31:32 +00:00
Commented May 14, 2012 at 9:31 — Lukas Eder
– Lukas Eder, Commented May 14, 2012 at 9:31

Vivien Barousse · Accepted Answer · 2012-05-14 09:25:18Z

1

When reading the String, you need to get the number of bytes read, and give the length to your String:

byte[] getit = new byte[1000];
int readed = pipedinputstream.read(getit);
print(new String(getit, 0, readed));

Note that if your String is longer than 1000 bytes, it will be truncated.

answered May 14, 2012 at 9:25

Vivien Barousse

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Comments

Drona · Accepted Answer · 2012-05-14 09:29:19Z

1

You are ignoring the number of bytes read. Do it as below:

  byte[] getit = new byte[1000]; 
  int bytesRead = pipedinputstream.read(getit); 
  print(new String(getit, 0, bytesRead).length());

answered May 14, 2012 at 9:29

Drona

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Comments

Shine · Accepted Answer · 2012-05-14 09:30:32Z

0

public String getText (byte[] arr)
{
StringBuilder sb = new StringBuilder (arr.length);

for (byte b: arr)
    if (b != 32)
        sb.append ((char) b);

return sb.toString ();
}

not so clean, but should work.

answered May 14, 2012 at 9:30

Shine

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Comments

user207421 · Accepted Answer · 2012-05-14 09:54:04Z

-1

I am converting a String to byte[] and then again byte[] to String

Why? The round trip is guaranteed not to work. String is not a container for binary data. Don't do this. Stop beating your head against the wall: the pain will stop after a while.

answered May 14, 2012 at 9:54

user207421

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3 Comments

Vineet Menon Over a year ago

i want data to flow thru the pipedinputstream! it takes only byte[] as argument...

user207421 Over a year ago

@VineetMenon So wrap InputStreamReader and OutputStreamWriter around them, then you can write chars. But my next question would be why you think you need pipes? I've never put a piped stream into production in 15 years.

Vineet Menon Over a year ago

:I want to exchange data(text) between 2 threads...synch. Anyways the problem is solved by Vivien's Solution..

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