How to Append Content to File in Java

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1. Overview

In Java, we can use FileWriter(file, true) to append new content to the end of a file.
  1. All existing content will be overridden.
new FileWriter(file);
  1. Keep the existing content and append the new content to the end of a file.
new FileWriter(file,true);

2. FileWriter – Append file example

  1. Let's create a file "sample.txt" under a directory "C:/workspace".
  2. Keep some content in file C:/workspace/sample.txt like
There is some content in file
  1. Let's Java example to append new content to the end of a file.
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This Java program demonstrates how to append content to existing file contents.
 * @author javaguides.net
 */

public class AppendFileExample {
 
 private static final Logger LOGGER = LoggerFactory
   .getLogger(AppendFileExample.class);
 
 public static void main(String[] args) {
  appendToExitingFile();
 }
 
 public static void appendToExitingFile(){
  try (Writer writer = new FileWriter("C:/workspace/sample.txt",true);
    BufferedWriter bw = new BufferedWriter(writer)) {
   String content = "append something to existing file\n";
   bw.write(content);
  } catch (IOException e) {
   LOGGER.error(e.getMessage());
  }
 }
}
Output: Let's open the "sample.txt" and verify the content.
There is some content in file append something to existing file

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