Jodd is an open-source java library with lot of reusable components and feature rich utilities. This requires the library jodd-3.3.2.jar to be in classpath. The following example shows how to use FileUtil.appendBytes() API.
package com.bethecoder.tutorials.jodd.io; import java.io.File; import java.io.IOException; import jodd.io.FileUtil; public class AppendBytesToFileTest { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { FileUtil.appendBytes("C:/pqr.txt", "\nPQR2\nPQR2".getBytes()); FileUtil.appendBytes(new File("C:/xyz.txt"), "\nXYZ2\nXYZ2".getBytes()); } }