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i need to convert from string to same byte array:

String data = request.getParameter("data");

byte[] dataByte = new byte[]{};

data = -60,-33,-10,-119,126,114,-61,-31,55,-102,-35,-72,114,77,115,72,79,-117,102,64,98,-20,-75,27,58,-59,86,-97,106,19,-112,-79,100,105,115,107,100,105,114,101,99,116,111,114,95,115,97,102,101,46,99,111,110,102,105,103,49,52,53,53,83,112,97,99,101,115,83,116,111,114,101,114,117,99,111,110,116,101,110,116,85,114,108,61,115,116,111,114,101,58,47,47,50,48,49,50,47,49,48,47,49,47,57,47,53,50,47,57,100,48,48,48,48,55,97,45,54,50,48,48,45,52,54,52,102,45,97,48,48,97,45,50,52,97,100,52,98,100,55,50,53,53,48,46,98,105,110,124,109,105,109,101,116,121,112,101,61,97,112,112,108,105,99,97,116,105,111,110,47,111,99,116,101,116,45,115,116,114,101,97,109,124,115,105,122,101,61,52,53,57,53,49,124,101,110,99,111,100,105,110,103,61,85,84,70,45,56,124,108,111,99,97,108,101,61,114,117,95,124,105,100,61,52,49,48,56,101,57,100,100,50,100,56,45,56,102,54,97,45,52,54,55,54,45,56,53,99,57,45,50,52,54,102,55,57,57,55,101,102,48,99,77,111,110,32,79,99,116,32,48,49,32,48,57,58,53,50,58,49,53,32,78,79,86,83,84,32,50,48,49,50,119,111,114,107,115,112,97,99,101,97,100,109,105,110,97,100,109,105,110
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    split(",") then Byte.parseByte() Commented Oct 9, 2012 at 10:40

5 Answers 5

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String[] dataArray = data.split(",")

You can then iterate over that dataArray and then create byte[] out of it.

    String dataArray[] = data.split(",");
    byte[] bytes = new byte[dataArray.length];
    int count = 0;
    for(String str : dataArray)
    {
        bytes[count++] = Byte.parseByte(str);
    }

If you know character encoding then you can use #String.getBytes

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2 Comments

String.getBytes() semantics is quite different from what I suspect the OP wants and you indicate with your code fragment - that will give you the byte representation of the string, not the byte values that are comma-separated!
Problem is it is not clear how he has obtained that data string. If he wants to convert exact sequence then solution 1 will work. But it can be a simple print of byte[] which was created from string. That is why I have added second point.
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String.getBytes(String charsetName) will give you a byte-array. You will have to be careful re. specifying your character encoding.

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0

Use StringTokenizer or String.split() method and parse each substring to byte. Take care with encoding.

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Use String.split() and iterate over the resulting array:

String[] array = data.split(",");
byte[] dataByte = new byte[ array.length ];
for ( int i=0 ; i<array.length ; i++ ) { dataByte[ i ] = Byte.parseByte( array[ i ] ); }

Cheers,

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It's not clear, but I'm not convinced that the OP is getting a comma-separated string. I think that's more likely an illustration of the info they want
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You can use String#getBytes() method for this purpose: -

String data = request.getParameter("data");
byte[] dataByte = data.getBytes()

It uses the default character encoding.. You can specify your own..

See String#getBytes(Charset)

Or you can use Byte#parseByte(String) method in each value of the string array after splitting it: - 

    String data = request.getParameter("data");
    String arr[] = data.split(",");
    byte[] newarr = new byte[arr.length];

    int count = 0;
    for (String val: arr) {
        newarr[count++] = Byte.parseByte(val);
        System.out.println(Byte.parseByte(val) + ", ");
    }
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I don't think that is what the OP wants - this would give you the byte representation of the string, not the byte representation of the values separated by commas in the string...

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