Java 8 Write to File Examples: Three ways

In this article, we introduce you Java 8 Write to File Examples using Java 8 APIs along with Files.newBufferedWriter, Files.write and Files.newOutputStream.

Let’s deeper via examples below:

Write to file using BufferedWriter

You can use the newBufferedWriter(Path, Charset, OpenOption…) method to write to a file using a BufferedWriter.
The following code snippet shows how to create a file encoded in “US-ASCII” using this method:

Path path = Paths.get("D:/test.txt");
	//1st way 
	String str1 = "Using newBufferedWriter method!\n";
	try (BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
		writer.write(str1, 0, str1.length());
	} catch (IOException x) {
		System.err.format("IOException: %s%n", x);
	}

Path path = Paths.get("D:/test.txt");

//1st way

String str1 = "Using newBufferedWriter method!\n";

try (BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {

writer.write(str1, 0, str1.length());

} catch (IOException x) {

System.err.format("IOException: %s%n", x);

}

Write to file using Files.write()
You can use Files.write method to write bytes, or lines, to a file.

	//2nd way
	String str2 = "Using Files.write method !\n";
	try {
		Files.write(path, str2.getBytes(StandardCharsets.UTF_8),CREATE,APPEND);
	} catch (IOException x) {
		System.err.println(x);
	}

//2nd way

String str2 = "Using Files.write method !\n";

try {

Files.write(path, str2.getBytes(StandardCharsets.UTF_8),CREATE,APPEND);

} catch (IOException x) {

System.err.println(x);

}

Writing to file using Stream I/O

You can create a file, append to a file, or write to a file by using the newOutputStream(Path, OpenOption…) method. This method opens or creates a file for writing bytes and returns an unbuffered output stream.

	//3rd way
	String str3 = "Using newOutputStream method\n";
	byte data[] = str3.getBytes(StandardCharsets.UTF_8);

	try (OutputStream out = new BufferedOutputStream(
	  Files.newOutputStream(path, CREATE, APPEND))) {
	  out.write(data, 0, data.length);
	} catch (IOException x) {
	  System.err.println(x);
	}