Java: Base64 Image Encoder

Hello Friends,

This Code convert your image file/data to Base64 Format which is nothing but text representation of your Image.

To convert this you need Encoder & Decoder which you will get from http://www.source-code.biz/base64coder/java/. It is File Base64Coder.java you will need.

Now to access this class as per your requirement you will need class below:

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

public class Base64 {

 public static void main(String args[]) throws IOException {
  /*
   * if (args.length != 2) {System.out.println(
   * "Command line parameters: inputFileName outputFileName");
   * System.exit(9); } encodeFile(args[0], args[1]);
   */
  File sourceImage = new File("back3.png");
  File sourceImage64 = new File("back3.txt");
  File destImage = new File("back4.png");
  encodeFile(sourceImage, sourceImage64);
  decodeFile(sourceImage64, destImage);
 }

 private static void encodeFile(File inputFile, File outputFile) throws IOException {
  BufferedInputStream in = null;
  BufferedWriter out = null;
  try {
   in = new BufferedInputStream(new FileInputStream(inputFile));
   out = new BufferedWriter(new FileWriter(outputFile));
   encodeStream(in, out);
   out.flush();
  } finally {
   if (in != null)
    in.close();
   if (out != null)
    out.close();
  }
 }

 private static void encodeStream(InputStream in, BufferedWriter out) throws IOException {
  int lineLength = 72;
  byte[] buf = new byte[lineLength / 4 * 3];
  while (true) {
   int len = in.read(buf);
   if (len <= 0)
    break;
   out.write(Base64Coder.encode(buf, 0, len));
   out.newLine();
  }
 }

 static String encodeArray(byte[] in) throws IOException {
  StringBuffer out = new StringBuffer();
  out.append(Base64Coder.encode(in, 0, in.length));
  return out.toString();
 }
 
 static byte[] decodeArray(String in) throws IOException {
  byte[] buf = Base64Coder.decodeLines(in);
  return buf;
 }

 private static void decodeFile(File inputFile, File outputFile) throws IOException {
  BufferedReader in = null;
  BufferedOutputStream out = null;
  try {
   in = new BufferedReader(new FileReader(inputFile));
   out = new BufferedOutputStream(new FileOutputStream(outputFile));
   decodeStream(in, out);
   out.flush();
  } finally {
   if (in != null)
    in.close();
   if (out != null)
    out.close();
  }
 }

 private static void decodeStream(BufferedReader in, OutputStream out) throws IOException {
  while (true) {
   String s = in.readLine();
   if (s == null)
    break;
   byte[] buf = Base64Coder.decodeLines(s);
   out.write(buf);
  }
 }
}

In Android you can convert your Bitmap to Base64 for Uploading to Server/Web Service.

Bitmap bmImage = //Data
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmImage.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageData = baos.toByteArray();
String encodedImage = Base64.encodeArray(imageData);

This "encodedImage" is text representation of your Image. You can use this for either uploading purpose or for diplaying directly into HTML Page as below:

<img src="data:image/png;base64,<%= encodedImage %>" width="100px"/>
<img src="data:image/png;base64,/9j/4AAQ...........1f/9k=" width="100px"/>