How to convert String to byte without changing?

Question

I need a solution to convert String to byte array without changing like this:

Input:

 String s=\"Test\";

Output:

String         


        

Answer 1

You may try the following code snippet -

String string = "Sample String";

byte[] byteArray = string.getBytes();

Answer 2

You can revert back using

String originalString = new String(b, "UTF-8");

That should get you back your original string. You don't want the bytes printed out directly.

Answer 3

You should always make sure serialization and deserialization are using the same character set, this maps characters to byte sequences and vice versa. By default String.getBytes() and new String(bytes) uses the default character set which could be Locale specific.

Use the getBytes(Charset) overload

byte[] bytes = s.getBytes(Charset.forName("UTF-8"));

Use the new String(bytes, Charset) constructor

String andBackAgain = new String(bytes, Charset.forName("UTF-8"));

Also Java 7 added the java.nio.charset.StandardCharsets class, so you don't need to use dodgy String constants anymore

byte[] bytes = s.getBytes(StandardCharsets.UTF_8);
String andBackAgain = new String(bytes, StandardCharsets.UTF_8);

Answer 4

In general that's probably not what you want to do, unless you're serializing or transmitting the data. Also, Java strings are UTF-16 rather than UTF-8, which what more like what you're expecting. If you really do want/need this then this should work:

String str = "Test";
byte[] raw = str.getBytes(new Charset("UTF-8", null));