This question already has answers here:
How to convert Java String into byte[]?
(9 answers)
Closed 5 years ago.
I have a string which represents an application (converted in bytes and then encoded in base64 -- if you ask yourself why, it is because i am transferring an application from a server to the client, in the hope of rebuilding it when transferred).
How would I get a Byte array back from this string?
String class has what you need (in java, a String is a class)
"this is a string".getBytes();
also take a look at this for base64 decoding of the String
org.apache.commons.codec.binary.Base64
java from 8 and beyond also has a base64 class built-in
java.util.Base64
Related
This question already has answers here:
Searching for a sequence of Bytes in a Binary File with Java
(5 answers)
Closed 5 years ago.
I come up an idea to read a byte[] array with the same size of the input, and check one by one. But it seems not very efficient. Is there a way to solve it by using rolling hash?
If you are using java 8 or above please check the
java.util.Optional<T>
The documentation is here
Optional
If I got what you mean correctly
This question already has answers here:
Convert String to KeyEvents
(16 answers)
Closed 7 years ago.
I need a way to do what is described in the first answer to this question: Type a String using java.awt.Robot
Only I would like to avoid using the clipboard. Is there a generic way to do it without?
(Other answers to the question address printing some hard-coded keys, but they don't help me print "Hello, world!")
You can use javax.swing.KeyStroke to transform the characters in your string into keycodes. For each key code, call Robot.keyPress(...), Robot.keyRelease(...) as you are doing in your previous question
This question already has answers here:
Java Serializable Object to Byte Array
(12 answers)
Closed 8 years ago.
I'm using a GoogleApiClient MessageApi method which accepts an arbitrary payload specified as a byte array.
For my payload I have some strings and a Bitmap that I want to transfer all together in one go.
What options are there available for packaging the strings and bitmaps and converting to a byte array?
A Bitmap can be converted to bytes through copyPixelsToBuffer. A string has getBytes.
This question already has answers here:
Java code To convert byte to Hexadecimal
(23 answers)
Closed 9 years ago.
I have a MAC address represented as a byte[] in Java and want it as a hexadecimal string, as they are usually represented. How can I do this with as easy as possible?
The byte array has length 6.
Try this:
String hexValue = String.format("%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
This question already has answers here:
how to convert image to byte array in java? [duplicate]
(9 answers)
Closed 10 years ago.
AoA. Dear, i need function which can convert an image into binary to store in database and reverse conversion for this binary to image using java.
Use Base64 Class to convert it into String and then store in Database. You can convert it back into image whenever it is required.
http://developer.android.com/reference/android/util/Base64.html