Java Example: Convert A binary file to data URI in Java

ToDataURI.java

package org.example;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import javax.xml.bind.DatatypeConverter;

public class ToDataURI {

	public static void main(String[] args) throws IOException {

		// source file
		File file = new File("movie.mp4");

		// check content type of the file
		String contentType = Files.probeContentType(file.toPath());

		// read data as byte[]
		byte[] data = Files.readAllBytes(file.toPath());

		// convert byte[] to base64(java7)
		String base64str = DatatypeConverter.printBase64Binary(data);

		// convert byte[] to base64(java8)
		// String base64str = Base64.getEncoder().encodeToString(data);

		// cretate "data URI"
		StringBuilder sb = new StringBuilder();
		sb.append("data:");
		sb.append(contentType);
		sb.append(";base64,");
		sb.append(base64str);

		System.out.println(sb.toString());

	}
}

1. Check file contentType
2. Read file data into byte[]
3. Convert byte[] data to base64
4. Create "data URI" format

THE FILE MUST BE UPLOADED?

👍 thanks