java image to base64 example

1public void imageEncoderDecoder() throws IOException {
2
3    // image path declaration
4    String imgPath = "src/main/resources/images/bean.png";
5
6    // read image from file
7    FileInputStream stream = new FileInputStream(imgPath);
8
9    // get byte array from image stream
10    int bufLength = 2048;
11    byte[] buffer = new byte[2048];
12    byte[] data;
13
14    ByteArrayOutputStream out = new ByteArrayOutputStream();
15    int readLength;
16    while ((readLength = stream.read(buffer, 0, bufLength)) != -1) {
17        out.write(buffer, 0, readLength);
18    }
19
20    data = out.toByteArray();
21    String imageString = Base64.getEncoder().withoutPadding().encodeToString(data);
22   byte[] decodeImg = Base64.getDecoder().decode(imageString);
23    out.close();
24    stream.close();
25
26    // System.out.println("Encode Image Result : " + imageString);
27    System.out.println("Decode Image Result : " + Arrays.toString(decodeImg));
28}

1       public static void main(String[] args) throws Exception{
2 
3           File f =  new File("/opt/myImage.jpg");
4             String encodstring = encodeFileToBase64Binary(f);
5             System.out.println(encodstring);
6       }
7 
8       private static String encodeFileToBase64Binary(File file) throws Exception{
9            FileInputStream fileInputStreamReader = new FileInputStream(file);
10            byte[] bytes = new byte[(int)file.length()];
11            fileInputStreamReader.read(bytes);
12            return new String(Base64.encodeBase64(bytes), "UTF-8");
13        }
14