java - How to convert byte array to string and vice versa?

Java - How to convert byte array to string and vice versa?

In Java, you can convert a byte array to a string and vice versa using appropriate constructors and methods provided by the String class and the getBytes() method. Here's how you can do it:

Convert Byte Array to String:

You can convert a byte array to a string using the String constructor that takes a byte array as an argument.

byte[] byteArray = {65, 66, 67, 68, 69}; // Example byte array String str = new String(byteArray); System.out.println("String: " + str); // Output: ABCDE

Convert String to Byte Array:

You can convert a string to a byte array using the getBytes() method of the String class.

String str = "Hello"; // Example string byte[] byteArray = str.getBytes(); System.out.println("Byte Array: " + Arrays.toString(byteArray)); // Output: [72, 101, 108, 108, 111]

Keep in mind that the conversion between byte arrays and strings relies on character encoding. When you convert a string to a byte array, you can specify the character encoding as an argument to the getBytes() method. For example:

String str = "Hello"; // Example string byte[] byteArray = str.getBytes(StandardCharsets.UTF_8); // Specify character encoding (UTF-8 in this case) System.out.println("Byte Array: " + Arrays.toString(byteArray));

Similarly, when you construct a string from a byte array, you can specify the character encoding as an argument to the String constructor. For example:

byte[] byteArray = {72, 101, 108, 108, 111}; // Example byte array String str = new String(byteArray, StandardCharsets.UTF_8); // Specify character encoding (UTF-8 in this case) System.out.println("String: " + str);

Ensure you handle character encoding consistently to avoid encoding/decoding issues.

Examples

  1. "Java byte array to string conversion example"

    • Description: This query helps users understand how to convert a byte array to a string in Java, which is a common task when dealing with data serialization or encoding.
    byte[] byteArray = {72, 101, 108, 108, 111}; // Example byte array String str = new String(byteArray); // Convert byte array to string System.out.println("Converted String: " + str);

  2. "Java string to byte array conversion example"

    • Description: This query addresses the reverse operation, converting a string back to a byte array in Java, which is necessary for tasks like data compression or network communication.
    String str = "Hello"; // Example string byte[] byteArray = str.getBytes(); // Convert string to byte array System.out.println("Converted Byte Array: " + Arrays.toString(byteArray));

  3. "Java byte array to hexadecimal string conversion"

    • Description: Users interested in representing byte arrays in hexadecimal format can use this query to find ways to achieve that in Java.
    byte[] byteArray = {10, 20, 30, 40}; // Example byte array String hexString = DatatypeConverter.printHexBinary(byteArray); // Convert byte array to hexadecimal string System.out.println("Hexadecimal String: " + hexString);

  4. "Java hexadecimal string to byte array conversion"

    • Description: This query addresses the reverse operation, converting a hexadecimal string back to a byte array in Java.
    String hexString = "0A141E28"; // Example hexadecimal string byte[] byteArray = DatatypeConverter.parseHexBinary(hexString); // Convert hexadecimal string to byte array System.out.println("Converted Byte Array: " + Arrays.toString(byteArray));

  5. "Java byte array to Base64 string conversion"

    • Description: Base64 encoding is commonly used for data transmission over networks. This query provides methods to convert byte arrays to Base64 strings.
    byte[] byteArray = {1, 2, 3, 4, 5}; // Example byte array String base64String = Base64.getEncoder().encodeToString(byteArray); // Convert byte array to Base64 string System.out.println("Base64 String: " + base64String);

  6. "Java Base64 string to byte array conversion"

    • Description: This query focuses on the reverse operation, converting Base64 strings back to byte arrays in Java.
    String base64String = "AQIDBAU="; // Example Base64 string byte[] byteArray = Base64.getDecoder().decode(base64String); // Convert Base64 string to byte array System.out.println("Converted Byte Array: " + Arrays.toString(byteArray));

  7. "Java byte array to ASCII string conversion"

    • Description: ASCII encoding is fundamental for text-based data exchange. This query guides users on how to convert byte arrays to ASCII strings.
    byte[] byteArray = {72, 101, 108, 108, 111}; // Example byte array String asciiString = new String(byteArray, StandardCharsets.US_ASCII); // Convert byte array to ASCII string System.out.println("ASCII String: " + asciiString);

  8. "Java ASCII string to byte array conversion"

    • Description: Conversely, this query helps users convert ASCII strings back to byte arrays in Java.
    String asciiString = "Hello"; // Example ASCII string byte[] byteArray = asciiString.getBytes(StandardCharsets.US_ASCII); // Convert ASCII string to byte array System.out.println("Converted Byte Array: " + Arrays.toString(byteArray));

  9. "Java byte array to UTF-8 string conversion"

    • Description: UTF-8 encoding is widely used for internationalization. Users can utilize this query to convert byte arrays to UTF-8 strings.
    byte[] byteArray = {72, 101, 108, 108, 111}; // Example byte array String utf8String = new String(byteArray, StandardCharsets.UTF_8); // Convert byte array to UTF-8 string System.out.println("UTF-8 String: " + utf8String);

  10. "Java UTF-8 string to byte array conversion"

    • Description: Finally, this query aids users in converting UTF-8 strings back to byte arrays in Java.
    String utf8String = "Hello"; // Example UTF-8 string byte[] byteArray = utf8String.getBytes(StandardCharsets.UTF_8); // Convert UTF-8 string to byte array System.out.println("Converted Byte Array: " + Arrays.toString(byteArray));

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