Java tutorial
//package com.java2s; import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; public class Main { public static byte[] readFile(File f) throws IOException { FileInputStream fis = new FileInputStream(f); try { ByteArrayOutputStream baos = new ByteArrayOutputStream(); BufferedInputStream bis = new BufferedInputStream(fis); int ch; while ((ch = bis.read()) >= 0) { baos.write(ch); } baos.flush(); return baos.toByteArray(); } finally { fis.close(); } } }