How best to convert a byte[] array to a string buffer

Question

I have a number of byte[] array variables I need to convert to string buffers.

is there a method for this type of conversion ?

Thanks

Thank you all for your responses..However I didn't make myself clear.... I'm using some byte[] arrays pre-defined as public static "under" the class declaration for my java program. these "fields" are reused during the "life" of the process. As the program issues status messages, (written to a file) I've defined a string buffer (mesg_data) that used to format a status message. So as the program executes I tried msg2 = String(byte_array2) I get a compiler error: cannot find symbol symbol : method String(byte[]) location: class APPC_LU62.java.LU62XnsCvr convrsID = String(conversation_ID) ;

example:

public class LU62XnsCvr extends Object
           .
           .
static String convrsID ; 
static byte[] conversation_ID = new byte[8] ;

So I can't use a "dynamic" define of a string variable because the same variable is used in multiple occurances.

I hope I made myself clear Thanks ever so much

Guy

you need the byte string representation? or each byte represent a char? — Dave
– Dave, Commented Apr 28, 2011 at 18:33

helpermethod · Accepted Answer · 2015-07-22 09:35:54Z

6

String s = new String(myByteArray, "UTF-8");
StringBuilder sb = new StringBuilder(s);

edited Jul 22, 2015 at 9:35

answered Apr 28, 2011 at 18:32

helpermethod

62.8k71 gold badges201 silver badges281 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

helpermethod Over a year ago

Why was this downvoted? Because of the missing character encoding?

AgilePro Over a year ago

Yes, you should specify the character encoding. If you want one byte maps to one character, then use the "US-ASCII" encoding. If you don't specify the encoding, you may get different results in different environments. In any case specifying "US-ASCII" makes it clear.

Itay Maman · Accepted Answer · 2011-04-28 18:31:22Z

5

There is a constructor that a byte array and encoding:

 byte[] bytes = new byte[200];
 //...

 String s = new String(bytes, "UTF-8");

In order to translate bytes to characters you need to specify encoding: the scheme by which sequences (typically of length 1,2 or 3) of 0-255 values (that is: sequence of bytes) are mapped to characters. UTF-8 is probably the best bet as a default.

answered Apr 28, 2011 at 18:31

Itay Maman

30.8k12 gold badges93 silver badges124 bronze badges

Comments

Martin · Accepted Answer · 2011-04-28 18:31:03Z

3

You can turn it to a String directly

byte[] bytearray
....
String mystring = new String(bytearray)

and then to convert to a StringBuffer

StringBuffer buffer = new StringBuffer(mystring)

answered Apr 28, 2011 at 18:31

Martin

7,1494 gold badges32 silver badges43 bronze badges

Comments

Void · Accepted Answer · 2011-04-28 18:31:48Z

1

You may use

str = new String(bytes)

By thewhat the code above does is to create a java String (i.e. UTF-16) with the default platform character encoding.

If the byte array was created from a string encoded in the platform default character encoding this will work well.

If not you need to specify the correct character encoding (Charset) as

String str = new String (byte [] bytes, Charset charset)

answered Apr 28, 2011 at 18:31

community wiki

Void

Comments

pickypg · Accepted Answer · 2011-04-28 18:31:35Z

0

It depends entirely on the character encoding, but you want:

String value = new String(bytes, "US-ASCII");

This would work for US-ASCII values.

See Charset for other valid character encodings (e.g., UTF-8)

answered Apr 28, 2011 at 18:31

pickypg

22.4k5 gold badges75 silver badges85 bronze badges

Collectives™ on Stack Overflow

How best to convert a byte[] array to a string buffer

5 Answers 5

2 Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

2 Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related