How to read file in Java – BufferedReader

In this Java tutorial , you can use java.io.BufferedReader to read content from a file.

Note
There are many ways to read a file, but this BufferedReader is the simplest and most common-used method.

1. Classic BufferedReader

A classic BufferedReader to read content from a file.

E:\\test\\filename.txt

This is the content to write into file
This is the content to write into file

ReadFileExample.java

package com.mycareerrepublic;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileExample {

 private static final String FILENAME = "E:\\test\\filename.txt";

 public static void main(String[] args) {

  BufferedReader br = null;
  FileReader fr = null;

  try {

   fr = new FileReader(FILENAME);
   br = new BufferedReader(fr);

   String sCurrentLine;

   br = new BufferedReader(new FileReader(FILENAME));

   while ((sCurrentLine = br.readLine()) != null) {
    System.out.println(sCurrentLine);
   }

  } catch (IOException e) {

   e.printStackTrace();

  } finally {

   try {

    if (br != null)
     br.close();

    if (fr != null)
     fr.close();

   } catch (IOException ex) {

    ex.printStackTrace();

   }

  }

 }

}

Output :

This is the content to write into file
This is the content to write into file

2. JDK7 Example

try-with-resources example to auto close the file reader.

ReadFileExample1.java

package com.mycareerrepublic;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileExample2 {

 private static final String FILENAME = "E:\\test\\filename.txt";

 public static void main(String[] args) {

  try (BufferedReader br = new BufferedReader(new FileReader(FILENAME))) {

   String sCurrentLine;

   while ((sCurrentLine = br.readLine()) != null) {
    System.out.println(sCurrentLine);
   }

  } catch (IOException e) {
   e.printStackTrace();
  }

 }

}

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About Mariano

I'm Ethan Mariano a software engineer by profession and reader/writter by passion.I have good understanding and knowledge of AngularJS, Database, javascript, web development, digital marketing and exploring other technologies related to Software development.