Java get string from byte array

Question

I am modding a java program and in it a handler receives 2 byte arrays When I print those arrays using a line of code like this\

java.util.Arrays.toString(this.part1))

I get an output like this

[43, 83, 123, 97, 104, -10, -4, 124, -113, -56, 118, -23, -25, -13, -9, -85, 58, -66, -34, 38, -55, -28, -40, 125, 22, -83, -72, -93, 73, -117, -59, 72, 105, -17, 3, -53, 121, -21, -19, 103, 101, -71, 54, 37...

I know these byte arrays contain a string. How might I get that string from them? Here is the code

    public void readPacketData(PacketBuffer data) throws IOException
{
    this.field_149302_a = data.readByteArray();
    this.field_149301_b = data.readByteArray();
    String packet1 = (java.util.Arrays.toString(this.field_149302_a));
    String packet2 = (java.util.Arrays.toString(this.field_149301_b));

}

possible duplicate of Java Byte Array to String to Byte Array — Thomas K.
– Thomas K., Commented Oct 18, 2015 at 17:18

1218985 · Accepted Answer · 2015-10-18 17:31:57Z

1

In order to convert Byte array into String format correctly, we have to explicitly create a String object and assign the Byte array to it. You can try this:

String str = new String(this.part1, "UTF-8"); //for UTF-8 encoding
System.out.println(str);

Please note that the byte array contains characters in a special encoding (that you must know).

edited Oct 18, 2015 at 17:31

answered Oct 18, 2015 at 17:15

1218985

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2 Comments

ElDoggo Over a year ago

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ElDoggo Over a year ago

This is what it outputs for some reason

Mureinik · Accepted Answer · 2015-10-18 17:16:34Z

0

String has a constructor from byte[], so you could just call new String(this.part1), or, if the bytes do not represent a string in the platform's default charster, use the overloaded flavor and pass the charset too.

answered Oct 18, 2015 at 17:16

Mureinik

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Alexey Fob Polbitsyn · Accepted Answer · 2015-10-18 18:13:21Z

0

actually to convert bytes to String you need encoding name. You need to change UTF-8 to correct encoding name in first answer to avoid wrong output, try UTF-16 or one of https://docs.oracle.com/javase/8/docs/technotes/guides/intl/encoding.doc.html (try to choose by your locale).

answered Oct 18, 2015 at 18:13

Alexey Fob Polbitsyn

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