How to Convert string to byte?

Question

How can I convert a String containing number like "00110011" to bytes using Java? I have tried some code as follows-

System.Text.Encoding enc = System.Text.Encoding.ASCII; 
byte[] myByteArray = enc.GetBytes("a text string"); 
string myString = enc.GetString(myByteArray );

Is the number in base 2? And you trying to do a binary conversion? — Chris Cooper, Mar 19 '13 at 12:53
http://stackoverflow.com/questions/11528898/convert-byte-to-binary-in-java — c.pramod, Mar 19 '13 at 12:53
I have a feeling that what he wants from string "00110011" is to have byte array like {0, 0, 1, 1, 0, 0, 1, 1}; — jonasnas, Mar 19 '13 at 13:04
@jonasnas I want to convert an IP Address (converted to bits and then again to string) back to byte array. — Prasad, Mar 19 '13 at 13:28

Nikolay Kuznetsov · Accepted Answer · 2013-03-19T13:44:15.860

2

Try:

int num = Integer.parseInt("00110011", 2);
byte b = (byte)num;

edited Mar 19 '13 at 13:44

answered Mar 19 '13 at 12:53

Nikolay Kuznetsov

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Thanks, but this one is having some limitations. I want to convert an IP Address (converted to bits and then again to string) back to byte array. Can you please help? – Prasad Mar 19 '13 at 13:25
@PrasadPofali, I don't understand exactly. And I think you better ask another question where you provide example of input and output. – Nikolay Kuznetsov Mar 19 '13 at 13:31
If I write byte b = Byte.parseByte("11000000",2); It will result in NumberFormatException : Value out of range. – Prasad Mar 19 '13 at 13:39
@PrasadPofali, so use first snippet. – Nikolay Kuznetsov Mar 19 '13 at 13:44

score 0 · Answer 2 · answered Mar 19 '13 at 12:55

0

Do you mean convert a binary number expressed as a string to an int?

If so, then:

String binaryString = "00110011";
int base = 2;
int decimal = Integer.parseInt(binaryString, base);

answered Mar 19 '13 at 12:55

NickJ

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If binaryString is having string "11000000" it shows NumberFormatException : Value Out of range. – Prasad Mar 19 '13 at 13:33

score -1 · Answer 3 · edited Mar 19 '13 at 12:55

-1

Try something like this

String str =  "00110011";
byte[] bytes = str.getBytes();

Alternatively you can send an Encoding to getBytes like "UTF-16", so str.getBytes("UTF-16")

edited Mar 19 '13 at 12:55

Harry Joy

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answered Mar 19 '13 at 12:53

sahmed24

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How to Convert string to byte?

3 Answers3