Reading file in java

Reading file in java can be done using either FileInputStream or BufferedReader.

Reading File in java using FileInputStream

The below code uses a FileInputStream to get access of the File and then read each character of the file.

We are using a StringBuffer to store all the contents of the file and then display it once the entire file is read.

We are using Java 7 try-with-resource feature (check Try-with-resources Statement – Java 7), hence we are not releasing the used FileInputStream resource.

package com.kscodes.sampleproject;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class FileReadingFIS {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		File file = new File("C:\\testFileForReading.txt");

		StringBuffer sb = new StringBuffer();
		try (FileInputStream fis = new FileInputStream(file)) {

			int content;
			while ((content = fis.read()) != -1) {
				sb.append((char) content);
			}

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

		System.out.println("The contents of the file are ::");
		System.out.println(sb.toString());

	}

}

package com.kscodes.sampleproject;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

public class FileReadingFIS {

/**

* @param args

public static void main(String[] args) {

File file = new File("C:\\testFileForReading.txt");

StringBuffer sb = new StringBuffer();

try (FileInputStream fis = new FileInputStream(file)) {

int content;

while ((content = fis.read()) != -1) {

sb.append((char) content);

}

} catch (IOException e) {

e.printStackTrace();

}

System.out.println("The contents of the file are ::");

System.out.println(sb.toString());

}