How to convert a file to base64 encoded format

Applies to

HCL Digital Experience 9.5 and higher

Introduction

This document describes a sample JSP code that you can use to convert a file (for example, a PNG image file) to base64 encoded format.

Instructions

DISCLAIMER OF WARRANTIES

The following enclosed code is sample code created by HCL Corporation. This sample code is provided to you solely for the purpose of assisting you in the development of your applications. The code is provided "AS IS", without warranty of any kind. HCL shall not be liable for any damages arising out of your use of the sample code, even if they have been advised of the possibility of such damages.

<%@page session="false" contentType="text/html" pageEncoding="ISO-8859-1" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.net.*" %>
<%@ page import="java.lang.*" %>
<%@ page import="java.util.*,javax.servlet.jsp.JspWriter,java.io.*" %>
<%@ page import="java.io.FileNotFoundException, java.io.IOException, java.io.InputStreamReader, java.util.ArrayList, java.util.Map, java.util.logging.Logger" %>
<br>

<H1>
    Convert image file to bytes for image upload
</H1>

<form action="convert.jsp" method="GET">
    Enter path to image file:<br><br>
<textarea rows="1" cols="100" name="path"></textarea>
<br>
<input type="submit">
</form>

</div>

<% String path = (String) request.getParameter("path");

if (path != null) {
    String trimpath = path.trim();
    out.println("Converting file: " + path);
    java.nio.file.Path mypath = java.nio.file.Paths.get(path);
    byte[] mydata = java.nio.file.Files.readAllBytes(mypath);
    String str = DatatypeConverter.printBase64Binary(mydata);
    out.println("<br>str = " + str);
}

You can also check the Free Formater website to decode a base64 encoded stream.