Read a file line by line in Java

 Below code snippet shows how to read a file line-by-line in Java

	package com.blogspot.devnip.files;
	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	/**
	* Read file line by line.
	*/
	public class ReadFileLineByLine {
	public static String read() {
	String fileName = "/multiline-text-file.txt";
	InputStream is = ReadFileLineByLine.class.getResourceAsStream(fileName);
	StringBuilder resultStringBuilder = new StringBuilder();
	try (BufferedReader br = new BufferedReader(new InputStreamReader(is))) {
	String line;
	while ((line = br.readLine()) != null) {
	resultStringBuilder.append(line)
	.append("\n");
	}
	} catch (IOException e) {
	e.printStackTrace();
	}
	return resultStringBuilder.toString();
	}
	}

view raw ReadFileLineByLine.java delivered with ❤ by emgithub

And below is a simple test.

	package com.blogspot.devnip.files;
	import org.junit.jupiter.api.Assertions;
	import org.junit.jupiter.api.Test;
	class ReadFileLineByLineTest {
	private static final String expectedContent =
	"Line number one.\n" +
	"Line number two.\n";
	@Test
	void test() {
	Assertions.assertEquals(expectedContent, ReadFileLineByLine.read());
	}
	}

view raw ReadFileLineByLineTest.java delivered with ❤ by emgithub