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Java 8 Image to Base 64 Java

loizenai/image-to-base-64-java-8

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README.md

Image to Base64 Java using Java 8 Encode Decode

Tutorial: “Convert Image to Base64 Java – Java 8 Encode Decode an Image to Base64 tutorial”

With Java 8, Base64 has finally got its due. Java 8 now has inbuilt encoder and decoder for Base64 encoding. For some purpose like transfering an image through RestfulAPI or saving an image to a DataBase, We need Encoder (Decode) the image to Base64. In the tutorial, I will guide you how to use Java 8 for converting.

Technologies – Java 8 Encode Decode an Image to Base64 tutorial

Note: Prepare an Image at folder C:\base64\image.jpg

This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme. The implementation of this class supports the following types of Base64 as specified in RFC 4648 and RFC 2045:

1. Basic Uses “The Base64 Alphabet” as specified in Table 1 of RFC 4648 and RFC 2045 for encoding and decoding operation. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.
2. URL and Filename safe Uses the “URL and Filename safe Base64 Alphabet” as specified in Table 2 of RFC 4648 for encoding and decoding. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.
3. MIME Uses the “The Base64 Alphabet” as specified in Table 1 of RFC 2045 for encoding and decoding operation. The encoded output must be represented in lines of no more than 76 characters each and uses a carriage return ‘\r’ followed immediately by a linefeed ‘\n’ as the line separator. No line separator is added to the end of the encoded output. All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation.

About

Java 8 Image to Base 64 Java

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Convert an Image to base64 string in java

In this tutorial, we will explore how to convert an image to Base64 encoding using Java. Base64 is a widely used encoding scheme that represents binary data in an ASCII string format. By converting an image to Base64, you can easily embed the image in a web page, an email, or even store it in a database as text data.

Prerequisites

To follow this tutorial, you need a basic understanding of Java programming and familiarity with the concept of Base64 encoding.

Java Libraries for Image Conversion

Java provides built-in support for converting images to Base64 encoding using the following libraries:

• Java SE’s javax.xml.bind (up to JDK 8)
• Java SE’s java.util.Base64 (from JDK 8 onwards)
• Apache Commons Codec

Method 1: Using java.util.Base64 (JDK 8+)

Starting from JDK 8, Java provides a new java.util.Base64 class to perform Base64 encoding and decoding. The following example demonstrates how to convert an image file to a Base64-encoded string using this class:

Replace the path/to/your/image.jpg placeholder with the actual path to your image file.

Method 2: Using Apache Commons Codec

If you are using an older version of Java (prior to JDK 8) or prefer to use the Apache Commons Codec library, you can follow this example:

First, add the Apache Commons Codec dependency to your project. For Maven, include the following in your pom.xml :

For Gradle, add this to your build.gradle :

Next, implement the image-to-Base64 conversion using the org.apache.commons.codec.binary.Base64 class:

Again, make sure to replace the path/to/your/image.jpg placeholder with the actual path to your image file.

Conclusion

In this tutorial, we have explored two methods for converting an image to Base64 encoding using Java. By leveraging the built-in java.util.Base64 class (from JDK 8 onwards) or the Apache Commons Codec library, you can easily convert images to Base64 strings for various use cases, such as embedding images in web pages or emails.

It’s essential to consider the implications of using Base64-encoded images, as they can increase the size of your data by approximately 33%. However, in specific situations where binary data handling is not possible or practical, converting images to Base64 can be a viable solution.

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Convert Image to Base64 String or Base64 String to Image in Java

In this tutorial you will learn how to convert or encode image to Base64 string and convert or decode Base64 string to image in Java.

What is Base64?

Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation.

Why we need to convert image to Base64 string?

• What we will do if we want to store some image in database without using blob type?
• What we will do if we want to send and receive image to and from server?

These kinds of situations can be solved easily by converting the image into Base64 string format.

Note: Here we will require Apache Common Codec library. So download it from below link.

How to Convert or Encode Image to Base64 String?

• Read the image using FileInputStream and convert it to byte array.
• Convert the byte array to Base64 string by using encodeBase64String() method.

How to Convert or Decode Base64 String to Image?

• Convert Base64 string to byte array using decodeBase64() method.
• Now convert the byte array to image using FileOutputStream.

In below example I am first reading an image from some location and then converting it to string. After that I am converting it to image and saving to some location.

Make sure you change the path of the image according to your system.

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Java Convert Image to Base64 String and Base64 to Image

In this post, we will be converting an image to base64 string so that it can be save to a database, more accurately in a blob type column.

Encode Image to Base64 String

The below method will encode the Image to Base64 String. The result will be a String consisting of random characters, representing the image. This characters can then be save to the database. A blob type column is more applicable when saving an image to the database since a blob column can hold large amount of data.

public static String encodeToString(BufferedImage image, String type) < String imageString = null; ByteArrayOutputStream bos = new ByteArrayOutputStream(); try < ImageIO.write(image, type, bos); byte[] imageBytes = bos.toByteArray(); BASE64Encoder encoder = new BASE64Encoder(); imageString = encoder.encode(imageBytes); bos.close(); >catch (IOException e) < e.printStackTrace(); >return imageString; >

Decode Base64 String to Image

Meanwhile, you can also decode your base64 string to an image to be save or sent to the client. Below is a method on how to decode base64 string to image.

public static BufferedImage decodeToImage(String imageString) < BufferedImage image = null; byte[] imageByte; try < BASE64Decoder decoder = new BASE64Decoder(); imageByte = decoder.decodeBuffer(imageString); ByteArrayInputStream bis = new ByteArrayInputStream(imageByte); image = ImageIO.read(bis); bis.close(); >catch (Exception e) < e.printStackTrace(); >return image; >

For example, if the data/string came from a client request, if the base64 string starts with something like data:image/png;base64,iVBORw0KGgoAA….. you should remove data:image/png;base64, . Therefore, your base64 string should starts with eg. iVBORw0KGgoAA.

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Преобразование изображения в строку Base64

В этом кратком руководстве мы рассмотрим, как кодировать файл изображения в строку Base64 , а затем декодировать его, чтобы получить исходное изображение с помощью Apache Common IO и Java 8 собственные функции Base64.

Эта операция может быть применена к любым двоичным файлам или двоичным массивам. Это полезно, когда нам нужно перенести двоичный контент в формате JSON, например, из мобильного приложения в конечную точку REST.

Для получения дополнительной информации о преобразовании Base64 ознакомьтесь с этой статьей здесь .

2. Зависимость Maven

Давайте добавим следующие зависимости в pom.xml файл:

Вы можете найти последнюю версию Apache Commons IO на Maven Central .

3. Преобразуйте файл изображения в строку Base64

Прежде всего, давайте прочитаем содержимое файла в массив байтов и используем класс Java 8 Base64 для его кодирования:

byte[] fileContent = FileUtils.readFileToByteArray(new File(filePath)); String encodedString = Base64.getEncoder().encodeToString(fileContent);

Закодированная строка представляет собой Строку символов в наборе A-Za-z0-9+/ , и декодер отклоняет любые символы за пределами этого набора.

4. Преобразуйте строку Base64 в файл изображения

Теперь у нас есть Base64 String , давайте декодируем его обратно в двоичный контент и запишем в новый файл:

byte[] decodedBytes = Base64.getDecoder().decode(encodedString); FileUtils.writeByteArrayToFile(new File(outputFileName), decodedBytes);

5. Тестирование Нашего Кода

Наконец, мы можем убедиться, что код работает правильно , прочитав файл, закодировав его в строку Base64 | и декодировав его обратно в новый файл:

public class FileToBase64StringConversionUnitTest < private String inputFilePath = "test_image.jpg"; private String outputFilePath = "test_image_copy.jpg"; @Test public void fileToBase64StringConversion() throws IOException < // load file from /src/test/resources ClassLoader classLoader = getClass().getClassLoader(); File inputFile = new File(classLoader .getResource(inputFilePath) .getFile()); byte[] fileContent = FileUtils.readFileToByteArray(inputFile); String encodedString = Base64 .getEncoder() .encodeToString(fileContent); // create output file File outputFile = new File(inputFile .getParentFile() .getAbsolutePath() + File.pathSeparator + outputFilePath); // decode the string and write to file byte[] decodedBytes = Base64 .getDecoder() .decode(encodedString); FileUtils.writeByteArrayToFile(outputFile, decodedBytes); assertTrue(FileUtils.contentEquals(inputFile, outputFile)); >>

6. Заключение

В этой статье по существу объясняются основы кодирования содержимого любого файла в Base64 String , а также декодирования Base64 String в массив байтов и сохранения его в файл с помощью функций Apache Common IO и Java 8.

Как всегда, фрагменты кода можно найти на GitHub .

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