how to encode servlet response to base64?

Question

I was trying to send the images in servlet to ajax call but its showing some characters in my browser instead. my question is how to encode servlet response in base64. I have an image as response.

Servlet code :

response.setContentType("image/jpeg");
ServletOutputStream out;  
out = response.getOutputStream();
FileInputStream fin = new FileInputStream("D:\\Astro\\html5up-arcana (1)\\images\\1.jpg");

BufferedInputStream bin = new BufferedInputStream(fin);  
BufferedOutputStream bout = new BufferedOutputStream(out);  
int ch =0; ;  
while((ch=bin.read())!=-1) {  
    bout.write(ch);  
}  

Ajax code :

$(document).ready(function() {
    $('#nxt').click(function() {
        $.ajax({
            url : 'DisplayImage',
            data : {
                userName : 'Hi'
            },
            success : function(result) {
                $('#gallery-overlay').html('<img src="data:image/jpeg;base64,'+result+'"/>');
            }
        });
    });
});

Answer 1

• Using java.util.Base64 JDK8

  byte[] contents = new byte[1024];
  int bytesRead = 0;
  String strFileContents;
  while ((bytesRead = bin.read(contents)) != -1) {
      bout.write(java.util.Base64.getEncoder().encode(contents), bytesRead);
  }
  

• Using sun.misc.BASE64Encoder, Note that: The Oracle says that the sun.* packages are not part of the supported, public interface. Therefore try to prevent using this method

  sun.misc.BASE64Encoder encoder= new sun.misc.BASE64Encoder();
  byte[] contents = new byte[1024];
  int bytesRead = 0;
  String strFileContents;
  while ((bytesRead = bin.read(contents)) != -1) {
      bout.write(encoder.encode(contents).getBytes());
  }
  

• Using org.apache.commons.codec.binary.Base64

  byte[] contents = new byte[1024];
  int bytesRead = 0;
  while ((bytesRead = bin.read(contents)) != -1) {
      bout.write(org.apache.commons.codec.binary.Base64.encodeBase64(contents), bytesRead);
  }