BAEL-4856 Download a binary file using OkHttp

libraries-http-2/src/main/java/com/baeldung/okhttp/download/BinaryFileWriter.java

@@ -0,0 +1,34 @@
+package com.baeldung.okhttp.download;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class BinaryFileWriter implements AutoCloseable {
+
+  private static final int CHUNK_SIZE = 1024;
+  private final OutputStream outputStream;
+
+  public BinaryFileWriter(OutputStream outputStream) {
+    this.outputStream = outputStream;
+  }
+
+  public long write(InputStream inputStream) throws IOException {
+    try (BufferedInputStream input = new BufferedInputStream(inputStream)) {
+      byte[] dataBuffer = new byte[CHUNK_SIZE];
+      int readBytes;
+      long totalBytes = 0;
+      while ((readBytes = input.read(dataBuffer)) != -1) {
+        totalBytes += readBytes;
+        outputStream.write(dataBuffer, 0, readBytes);
+      }
+      return totalBytes;
+    }
+  }
+
+  @Override
+  public void close() throws IOException {
+    outputStream.close();
+  }
+}