How to read file in Java – BufferedReader

In Java, 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
ReadFileExample1.java

package com.mkyong;

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

public class ReadFileExample1 {

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

	public static void main(String[] args) {

		BufferedReader br = null;
		FileReader fr = null;

		try {

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

			String sCurrentLine;

			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.

ReadFileExample2.java

package com.mkyong;

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();
		}

	}

}

References

  1. The try-with-resources Statement
  2. How to append content to file in Java
  3. BufferedReader JavaDoc
  4. How to write to file in Java – BufferedWriter

About the Author

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mkyong
Founder of Mkyong.com, love Java and open source stuff. Follow him on Twitter, or befriend him on Facebook or Google Plus. If you like my tutorials, consider make a donation to these charities.

Comments

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Russel
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Russel

Di Shing

Deepak Murthy
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Deepak Murthy

Thank you for this blog, you have a very good coding style.
It helped me to pick up the code easily.

André
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André

Excelent!
just for comment, in your first example, the line
“br = new BufferedReader(new FileReader(FILENAME));”
wasn’t necessary!

Thank you!
I learn a lot with you!

mahanta chauhan
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mahanta chauhan

Why br is initialized twice?

I am groot
Guest
I am groot

fdbfd

galaczi
Guest
galaczi
public Ceg(String file) { Scanner scanner = null; try { scanner = new Scanner(new File(file)); } catch (FileNotFoundException ex) { System.out.println(“Allomany megnyitasi hiba!!”); System.exit(1); } while (scanner.hasNextLine()) { String line = scanner.nextLine(); if (line.length() != 0) { System.out.println(“***Line: ” + line); StringTokenizer stk = new StringTokenizer(line, “, .;:?!”); int id = Integer.parseInt(stk.nextToken()); String vezeteknev = stk.nextToken(); String keresztnev = stk.nextToken(); int eletkor = Integer.parseInt(stk.nextToken()); String beosztas = stk.nextToken(); Alkalmazott a = new Alkalmazott(id, vezeteknev, keresztnev, eletkor, beosztas); this.alkalmazott.add(a); } } }
Justin George
Guest
Justin George

Very Good article. Is there a way to access folder using authenitcation. Right now I’m using smb api for this. But it would be easier if the authentication can be done in this program.

abcd
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abcd

Verryyyyyyyyyyyyyy Guuuddddd!!!

Timothy Jlay
Guest
Timothy Jlay

hi I am very new to java and I would like to know how to write a program that would move multiple files from a different folder, delete the files from the previous folder and copy and rename those files in another folder

disqus_mLsYNn89SO
Guest
disqus_mLsYNn89SO

sssssssssssssssssss

karthik
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karthik

you are printing –

System.out.println(sCurrentLine);

what if i want to store them in string array ?

Kashey
Guest
Kashey

String [] aray = new String[10]; // 10 for example

try (BufferedReader br = new BufferedReader(new FileReader(“C:\testing.txt”)))
{

String sCurrentLine;
int count = 0;
while ((sCurrentLine = br.readLine()) != null) {
array[count++] = sCurrentLine;
}

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

Ciprian
Guest
Ciprian

Very good and “to the point” article! Congrats!

Moomal
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Moomal

Thanks a bunch! You just saved my day.

André
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André

Congratulations, for your posts, is has helped me a lot!

Dhanashree Makhe
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Dhanashree Makhe

Hello sir pls send me code of BufferReader…Sir please…

RAI
Guest
RAI

how can I read .txt in java web

Gowtham
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Gowtham

Hii,
try (BufferedReader br = new BufferedReader(new FileReader(“C:\testing.txt”))),

how to close this connection in finally? or else it will automatically closes.

Anand Kumar
Guest
Anand Kumar

can get complete file operations using java code here – http://www.javadiscover.com/search/label/File

Jens Preem
Guest
Jens Preem

What if when I want to read in file not from newline to newline but from some other token to token? Like from LABEL to LABEL etc. What tool should I use then?

prestige
Guest
prestige
i guess u have to use Scanner to read the file. public class readFile { public static void main(String args[]) { File f = new File(filePath); Scanner read = new Scanner(f).useDelimeter(“put anything as a delimeter eg: ##”); String content =read.next(); while((content=read.next()).hasNext()) { content += content; } } }
Dara
Guest
Dara

Itis a very good code. I alos have written some tips in Java for file access and manipulation including reading, writing, creating file, and folder,…http://www.worldbestlearningcenter.com/tips/Java-write-file.htm

trackback
Reading reading a text file in Java | Java Programming
Jane
Guest
Jane

HE HE HE HI

CJ
Guest
CJ

thanks you !

Raja
Guest
Raja

Hi, your codes works fine but i am getting an encrypted version, so how can i get non-encrypted version.

Dominik
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Dominik

Hi.

Thank you.

Good bye.

Jane
Guest
Jane

Hi, Goodbye, Thankyou, what the heck???
:( otherwise known as :(((

Nick
Guest
Nick

It is a really weird saying, I have to agree with that.

Dam
Guest
Dam

How can you adapt the code to allow the variable “sCurrentline”, to be manipulated through methods such as, .split(), out side of the try-catch statement. It will not even print “sCurrentLine”, unless it is in side the try-catch statement.

Fernando
Guest
Fernando

Hi, where the txt file should be placed??
I created a txt file on the same folder of the java files and the application always throw the FileNotFoundException. I tried different names, different format files, but it never finds the file.

Thanks

srija
Guest
srija

you can save it anywhere but you have to save it with .java extension

Muthukumar JeyaMurugan
Guest
Muthukumar JeyaMurugan

The entire Java File Operation like Reading, writing, Delete are found here,
http://antguider.blogspot.in/2012/06/java-file-operation.html

Rajesh
Guest
Rajesh

Thanks it worked for me.:)

Peter
Guest
Peter
Finally after much searching, you answered my question, Mike ! Thanks ! There are a lot of people out in the web asking the same question. When they and, (up till a few moments ago), myself included, try to “import” a simple text file into an Eclipse project, we were all receiving “file not found”. Being new to Java I was amazed that this was such an “issue” for eclipse. I like Eclipse but something so fundamental, shouldn’t be so frustratingly hard. I guess the Devs are busy working on other more urgent issues and we cant complain as it… Read more »
aljun
Guest
aljun

somebody help this problem …
how to read this file 1
23
45

Neo
Guest
Neo

In your example, you should make sure to close the BufferedReader, otherwise the file may be lock not readable by some other process.

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

br.close();
…..

trackback
How to read file from Java - BufferedInputStream Example | Java

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