Convert a byte array from one encoding to another java

Question

hi guys i should convert this code to C# in Java. Could you give me a hand?

private static String ConvertStringToHexStringByteArray(String input) {
        Encoding ebcdic = Encoding.GetEncoding("IBM037");
        Encoding utf8 = Encoding.UTF8;
        byte[] utfBytes = utf8.GetBytes(input);
        byte[] isoBytes = Encoding.Convert(utf8, ebcdic, utfBytes);
        StringBuilder hex = new StringBuilder(isoBytes.length * 2);
        foreach( byte b in isoBytes)
        hex.AppendFormat("{0:x2}", b);
        return hex.ToString();

    }

I tried to convert it to java like this. But the result is different:

private static String ConvertStringToHexStringByteArray(String input) throws UnsupportedEncodingException {

        byte[] isoBytes = input.getBytes("IBM037");
        StringBuilder hex = new StringBuilder(isoBytes.length * 2);

        for (byte b : isoBytes) {
            hex.append(String.format("%02x", b));
        }
        return hex.toString();

    }

input = "X1GRUPPO 00000000726272772"
expected = "e7f1c7d9e4d7d7d64040404040f0f0f0f0f0f0f0f0f1f6f7f3f5f3f5f5f2"
result = "e7f1c7d9e4d7d7d640f0f0f0f0f0f0f0f0f7f2f6f2f7f2f7f7f2"

what am I doing wrong?

Step one open a java IDE, step 2 write java code, step 3 when you have a problem paste your java code, and your actual issue — TheGeneral
– TheGeneral, Commented Nov 4, 2021 at 9:56
Do not "convert" code. You write down what it does and then you do not look at the original code any more and you implement these requirements in the other language. — Fildor
– Fildor, Commented Nov 4, 2021 at 9:58
What is the point of using EBCDIC? Why not just input.getBytes("UTF-8") or input.getBytes(StandardCharsets.UTF_8)? — VGR
– VGR, Commented Nov 4, 2021 at 14:23

Thomas Kläger · Accepted Answer · 2021-11-04 12:23:51Z

1

Your code works but you are comparing the output for two different input strings.

When you write expected and result side by side:

e7f1c7d9e4d7d7d64040404040f0f0f0f0f0f0f0f0f1f6f7f3f5f3f5f5f2
e7f1c7d9e4d7d7d640f0f0f0f0f0f0f0f0f7f2f6f2f7f2f7f7f2

you will notice that both start with the same sequence (e7f1c7d9e4d7d7d6) which seems to come from a common beginning X1GRUPPO

But then the two outputs differ:

4040404040f0f0f0f0f0f0f0f0f1f6f7f3f5f3f5f5f2
40f0f0f0f0f0f0f0f0f7f2f6f2f7f2f7f7f2

Reasoning from the input that you provided, the remainder of first input string starts with 5 spaces followed by "00000000167353552"

This means the complete input for the C# code was "X1GRUPPO 00000000167353552", which is not the same input that you provided to the Java code and then clearly the output cannot match.

answered Nov 4, 2021 at 12:23

Thomas Kläger

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1 Comment

KG_stackoverflow Over a year ago

you're right, I got the input wrong. thanks a lot

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