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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

– Eclipse
– Java 8

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

java.util.Base64

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.

[Java 8] Encode Image to Base64 Java


public static String encoder(String imagePath) {
	String base64Image = "";
	File file = new File(imagePath);
	try (FileInputStream imageInFile = new FileInputStream(file)) {
		// Reading a Image file from file system
		byte imageData[] = new byte[(int) file.length()];
		imageInFile.read(imageData);
		base64Image = Base64.getEncoder().encodeToString(imageData);
	} catch (FileNotFoundException e) {
		System.out.println("Image not found" + e);
	} catch (IOException ioe) {
		System.out.println("Exception while reading the Image " + ioe);
	}
	return base64Image;
}

[Java 8] Decode an Base64 Java String to Image


public static void decoder(String base64Image, String pathFile) {
	try (FileOutputStream imageOutFile = new FileOutputStream(pathFile)) {
		// Converting a Base64 String into Image byte array
		byte[] imageByteArray = Base64.getDecoder().decode(base64Image);
		imageOutFile.write(imageByteArray);
	} catch (FileNotFoundException e) {
		System.out.println("Image not found" + e);
	} catch (IOException ioe) {
		System.out.println("Exception while reading the Image " + ioe);
	}
}

IV. Full Sample


package com.javasampleapproach.base64image;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Base64;

public class Java8Base64Image {
	public static void main(String[] args) {
		String imagePath = "C:\\base64\\image.jpg";
		System.out.println("=================Encoder Image to Base 64!=================");
		String base64ImageString = encoder(imagePath);
		System.out.println("Base64ImageString = " + base64ImageString);

		System.out.println("=================Decoder Base64ImageString to Image!=================");
		decoder(base64ImageString, "C:\\base64\\decoderimage.jpg");

		System.out.println("DONE!");

	}

	public static String encoder(String imagePath) {
		String base64Image = "";
		File file = new File(imagePath);
		try (FileInputStream imageInFile = new FileInputStream(file)) {
			// Reading a Image file from file system
			byte imageData[] = new byte[(int) file.length()];
			imageInFile.read(imageData);
			base64Image = Base64.getEncoder().encodeToString(imageData);
		} catch (FileNotFoundException e) {
			System.out.println("Image not found" + e);
		} catch (IOException ioe) {
			System.out.println("Exception while reading the Image " + ioe);
		}
		return base64Image;
	}

	public static void decoder(String base64Image, String pathFile) {
		try (FileOutputStream imageOutFile = new FileOutputStream(pathFile)) {
			// Converting a Base64 String into Image byte array
			byte[] imageByteArray = Base64.getDecoder().decode(base64Image);
			imageOutFile.write(imageByteArray);
		} catch (FileNotFoundException e) {
			System.out.println("Image not found" + e);
		} catch (IOException ioe) {
			System.out.println("Exception while reading the Image " + ioe);
		}
	}
}

Sourcecode

Here is the sourcecode for Tutorial Encode/Decode Java Image to Base 64:

Java-8-Convert-Image-to-Base64

– Github Sourcecode: