Learn to convert byte array to String and convert String to byte array in Java with examples. Conversion between byte array and string may be used in many cases including IO operations, generate secure hashes etc.
To convert a byte array to Stringyou can use String class constructor with byte as constructor argument. Since Java 8, we have Base64 class is available.
So if you need to encode arbitrary binary data as text, Base64 is the way to go. To convert from string to byte array, use String. We should focus on type of input data when working with conversion between byte array and String in Java. A family guy with fun loving nature. Love computers, programming and solving everyday problems. Find me on Facebook and Twitter. Hello, With this method, can I encode a jpg picture byte array to a string?
Because that way would be easier to store on database. If yes, what about the reverse process? Can I encode this jpg picture string to a byte array? I have converted an image having metadata such as geolocation,date created ,manufacturer and mode to a Bytestream, but While constructing back the image from bytestream I am losing the above metadata, can you please tell me how I can construct an Image from bytestream, without losing its metadata.
I've tried various ways, from the very rudimentary xyz. Tried splitting up the string into an array, something like ["12", 34" Am I not understanding here how strings are getting converted or is there some way of accomplishing this? Any tips appreciated. Note: The regex? So you essentially want to grab two digits at a time, parse them to a byteand store them in a byte.
This can be achieved easily with String substring and Byte parseByte. The StringJoiner is used to display a pretty output of the elements of the array in hexadecimal :. This snippet assumes that the initial String will only hold one or more two-digit byte values.
Convert byte array to String – Convert String to byte array in Java
Asked 5 days ago. Active 5 days ago. Viewed 50 times. Edit: Sorry i forgot to mention the String can have alphanumeric characters eg. Active Oldest Votes. The upper border is exclusive. Morinator Morinator 1 1 silver badge 13 13 bronze badges. Do it as follows: import java. BigInteger; import java.
String to byte array, byte array to String in Java
Arrays; import java. I updated this answer, as the OP has since specified that the input is actually in hexadecimal. Jacob G. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.
The Overflow Blog. Socializing with co-workers while social distancing. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….In this article, you'll learn how to convert a byte array to a string in Java. We will also look at different ways to convert a string into a byte array. Conversion between byte array and string is one of the most common tasks in Java while reading filesgenerating crypto hashes, etc.hexadecimal string to byte array in java
The simplest way to convert a byte array to a string is to use the String class constructor with byte as an argument:. By default, new String uses the platform default character encoding to convert the byte array to a string. If the character encoding is different, you can specify it by passing another argument to new String as shown below:.
Since Java 8, we have Base64 class available that provides static methods for obtaining encoders and decoders for the Base64 encoding scheme. You can also use this class to encode byte array into a string as shown below:.
To convert a string to a byte array, just use String. This method uses the default character encoding to encode this string into a sequence of bytes. Here is an example:. The Base64 class can also be used to decode a string into a byte array as shown below:. Follow attacomsian on Twitter. Subscribe to RSS Feed. Need help to launch a new product? I am available for contract work.
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Conversely, you can convert a String object into a byte array of non-Unicode characters with the String. When invoking either of these methods, you specify the encoding identifier as one of the parameters. The example that follows converts characters between UTF-8 and Unicode. The full source code for the example is in the file StringConverter.
The StringConverter program starts by creating a String containing Unicode characters:. To convert the String object to UTF-8, invoke the getBytes method and specify the appropriate encoding identifier as a parameter. The getBytes method returns an array of bytes in UTF-8 format. To create a String object from an array of non-Unicode bytes, invoke the String constructor with the encoding parameter. The code that makes these calls is enclosed in a try block, in case the specified encoding is unsupported:.
The StringConverter program prints out the values in the utf8Bytes and defaultBytes arrays to demonstrate an important point: The length of the converted text might not be the same as the length of the source text. Some Unicode characters translate into single bytes, others into pairs or triplets of bytes.
The printBytes method displays the byte arrays by invoking the byteToHex method, which is defined in the source file, UnicodeFormatter. Here is the printBytes method:. The output of the printBytes method follows.
Note that only the first and last bytes, the A and C characters, are the same in both arrays:. All rights reserved. Hide TOC. Working with Text.The process of converting a byte array to a String is called decoding. This process requires a Charset.
Though, we should use charset for decoding a byte array. The simplest way to convert a byte array into String, we can use String class constructor with byte as the constructor argument. Remember the character encoding while converting the byte array to String. Since bytes is the binary data while String is character data. It is important to know the original encoding of the text from which the byte array has created. When we use a different character encoding, we do not get the original string back.
We do not have any character encoding while converting byte array to string. We convert byte array into String by using String class constructor, but it does not provide a guarantee that we will get the same text back. It is because the constructor of String class uses the platform's default encoding.
Bytes holds 8 bits which can have up to distinct values. If the character sets have more than values, we should explicitly specify the encoding which tells how to encode characters into a sequence of bytes. When we do not remember exact encoding, in such cases our platform is not able to convert those special characters properly. This problem is solved by providing " UTF-8 " as a character encoding. Java provides another overloaded constructor in String class which accepts character encoding.
In the following example, we have used StandardCharset. In the following example, We have taken char while creating the byte array. It works because of autoboxing. The char 'T' is being converted to 84 in the byte array and so on. That's why the output of both byte array is the same. The String class also has a constructor in which we can pass byte array and Charset as an argument. So the following statement can also be used to convert byte array to String in Java.
Better approach is to use StandardCharsets class introduced in Java 1. String also has a constructor where we can provide byte array and Charset as an argument. So below code can also be used to convert byte array to String in Java. One example is processing the byte array for cryptography algorithms.
To encrypt or decrypt a text you need to do calculations on individual bytes. To read and write on sockets we need a byteArray, so while writing on socket, convert your string into byteArray and write it on outStream, while reading from socket, read from inuptStream into a byteArray and convert it into string, if needed. Your email address will not be published. Table of Contents 1 String to byte array 1.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Is there any way to convert Java String to a byte not the boxed Byte? The second is an address. Is there anything I'm doing wrong? I need the result in a byte to feed it to gzip decompressor, which is as follows. However the problem you appear to be wrestling with is that this doesn't display very well.
Calling toString will just give you the default Object. In your result [B 38ee9f13the [B means byte and 38ee9f13 is the memory address, separated by an. But this will just display as a sequence of comma-separated integers, which may or may not be what you want. When converting to a byte you will get a different breakdown of bytes for the given glyphs of that Stringdepending upon the chosen charset.
You might wanna try return new String byteout. It is not necessary to change java as a String parameter. You have to change the c code to receive a String without a pointer and in its code:. Learn more.
How to convert Java String into byte? Ask Question. Asked 6 years, 7 months ago. Active 1 year, 11 months ago. Viewed 1. In trying this: System. Unable to display 1st output as it is a gzip string. Inflater ; java. ByteArrayInputStream gzip ; java. Mkl Rjv Mkl Rjv 5, 3 3 gold badges 16 16 silver badges 37 37 bronze badges. Sorry, I'm trying to convert a String to bytearray and back and getting a wrong result. I'll edit it in a while and get back.
Your problem is that String. Active Oldest Votes.