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JAVA-41593 core-java-io-5 module Splitted and article moved to core-java-io-2 module
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‎core-java-modules/core-java-io-2/README.md‎

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- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
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- [Java IO vs NIO](https://www.baeldung.com/java-io-vs-nio)
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- [Creating Temporary Directories in Java](https://www.baeldung.com/java-temp-directories)
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- [Convert an OutputStream to a Byte Array in Java](https://www.baeldung.com/java-outputstream-byte-array)
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- [[<-- Prev]](/core-java-modules/core-java-io)[[More -->]](/core-java-modules/core-java-io-3)

core-java-modules/core-java-io-5/src/test/java/com/baeldung/outputstreamtobytearray/OutputStreamToByteArrayUnitTest.java renamed to core-java-modules/core-java-io-2/src/test/java/com/baeldung/outputstreamtobytearray/OutputStreamToByteArrayUnitTest.java

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package com.baeldung.outputstreamtobytearray;
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import org.apache.commons.io.FileUtils;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.io.TempDir;
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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Path;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class OutputStreamToByteArrayUnitTest {
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@Test
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public void givenFileOutputStream_whenUsingFileUtilsToReadTheFile_thenReturnByteArray(@TempDir Path tempDir) throws IOException {
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String data = "Welcome to Baeldung!";
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String fileName = "file.txt";
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Path filePath = tempDir.resolve(fileName);
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try (FileOutputStream outputStream = new FileOutputStream(filePath.toFile())) {
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outputStream.write(data.getBytes(StandardCharsets.UTF_8));
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}
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byte[] writtenData = FileUtils.readFileToByteArray(filePath.toFile());
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String result = new String(writtenData, StandardCharsets.UTF_8);
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assertEquals(data, result);
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}
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@Test
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public void givenSystemOut_whenUsingDrainableOutputStream_thenReturnByteArray() throws IOException {
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String data = "Welcome to Baeldung!\n";
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DrainableOutputStream drainableOutputStream = new DrainableOutputStream(System.out);
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try (drainableOutputStream) {
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drainableOutputStream.write(data.getBytes(StandardCharsets.UTF_8));
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}
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byte[] writtenData = drainableOutputStream.toByteArray();
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assertEquals(data, new String(writtenData, StandardCharsets.UTF_8));
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}
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public class DrainableOutputStream extends FilterOutputStream {
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private final ByteArrayOutputStream buffer;
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public DrainableOutputStream(OutputStream out) {
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super(out);
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this.buffer = new ByteArrayOutputStream();
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}
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@Override
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public void write(byte b[]) throws IOException {
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buffer.write(b);
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super.write(b);
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}
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public byte[] toByteArray() {
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return buffer.toByteArray();
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}
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}
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}
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package com.baeldung.outputstreamtobytearray;
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import org.apache.commons.io.FileUtils;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.io.TempDir;
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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Path;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class OutputStreamToByteArrayUnitTest {
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@Test
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public void givenFileOutputStream_whenUsingFileUtilsToReadTheFile_thenReturnByteArray(@TempDir Path tempDir) throws IOException {
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String data = "Welcome to Baeldung!";
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String fileName = "file.txt";
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Path filePath = tempDir.resolve(fileName);
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try (FileOutputStream outputStream = new FileOutputStream(filePath.toFile())) {
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outputStream.write(data.getBytes(StandardCharsets.UTF_8));
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}
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byte[] writtenData = FileUtils.readFileToByteArray(filePath.toFile());
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String result = new String(writtenData, StandardCharsets.UTF_8);
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assertEquals(data, result);
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}
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@Test
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public void givenSystemOut_whenUsingDrainableOutputStream_thenReturnByteArray() throws IOException {
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String data = "Welcome to Baeldung!\n";
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DrainableOutputStream drainableOutputStream = new DrainableOutputStream(System.out);
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try {
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drainableOutputStream.write(data.getBytes(StandardCharsets.UTF_8));
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} finally {
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drainableOutputStream.close();
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}
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byte[] writtenData = drainableOutputStream.toByteArray();
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assertEquals(data, new String(writtenData, StandardCharsets.UTF_8));
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}
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public class DrainableOutputStream extends FilterOutputStream {
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private final ByteArrayOutputStream buffer;
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public DrainableOutputStream(OutputStream out) {
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super(out);
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this.buffer = new ByteArrayOutputStream();
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}
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@Override
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public void write(byte b[]) throws IOException {
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buffer.write(b);
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super.write(b);
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}
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public byte[] toByteArray() {
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return buffer.toByteArray();
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}
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}
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}

‎core-java-modules/core-java-io-5/README.md‎

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- [How to Write Strings to OutputStream in Java](https://www.baeldung.com/java-write-string-outputstream)
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- [Read a File and Split It Into Multiple Files in Java](https://www.baeldung.com/java-read-file-split-into-several)
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- [Read and Write Files in Java Using Separate Threads](https://www.baeldung.com/java-read-write-files-different-threads)
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- [Convert an OutputStream to a Byte Array in Java](https://www.baeldung.com/java-outputstream-byte-array)
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- [Reading a .gz File Line by Line Using GZIPInputStream](https://www.baeldung.com/java-gzipinputstream-read-gz-file-line-by-line)
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- [Opening HTML File Using Java](https://www.baeldung.com/java-open-html-file)
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- [PrintWriter write() vs print() Method in Java](https://www.baeldung.com/java-printwriter-write-vs-print)
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- [Format Output in a Table Format Using System.out](https://www.baeldung.com/java-format-output-table-system-out)
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- [[<-- Prev]](/core-java-modules/core-java-io-4)
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- [[<-- Prev]](/core-java-modules/core-java-io-4)

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