Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package org.lotus; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.apache.commons.codec.binary.Base64; /** * * @author Administrator */ public class Main { /** * @param args the command line arguments */ public static void main(String[] args) throws FileNotFoundException, IOException { File folder = new File(System.getProperty("user.dir")).getParentFile(); File inf = new File(folder, "img (1).png"); FileInputStream in = new FileInputStream(inf); byte[] buffer = new byte[(int) inf.length()]; in.read(buffer); in.close(); String str = Base64.encodeBase64URLSafeString(buffer); buffer = Base64.decodeBase64(str); FileOutputStream out = new FileOutputStream(new File(folder, "out.png")); out.write(buffer); out.close(); } }