Reading and Writing Files in Java

Here is code to read and write from a file in Java. You will have to change the output path and package appropriately.

package com.mycompany.app.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class FileHelper {
    
    public static void main(String[] args) {
        try {
            System.out.println("START");
            String outputPath = "/Users/Scott/workspace/myrepo/my-app/output/text.txt";
            FileHelper fileHelper = new FileHelper();
            fileHelper.write(new File(outputPath), "Hello World!
My First HTML Page!");
            String string = fileHelper.read(new File(outputPath));
            System.out.println("From FILE:"+string);
            System.out.println("FINISH");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    
    public String read(File inputFile) throws Exception {
        // Initialization
        String string = "";
        String line;
        
        // Read from file
        FileReader fr = new FileReader(inputFile);
        BufferedReader br = new BufferedReader(fr);
        while ((line = br.readLine()) != null) {
            string = string + line;
        }
        br.close();
        fr.close();
        
        return string;
    }

    public void write(File outputFile, String string) throws Exception {
        // Initialization
        if (!outputFile.exists()) {
            outputFile.createNewFile();
        }

        // Write to file
        FileWriter fw = new FileWriter(outputFile);
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write(string);
        bw.close();
        fw.close();

    }
}

Code Formatted by ToGoTutor

This post was reposted from http://scottizu.wordpress.com/2013/08/19/reading-and-writing-files-in-java/, originally written on August 19th, 2013.