InputStream to OutputStream in Java: transferTo and Files.copy
Copy an InputStream to OutputStream in Java with transferTo(), a custom loop, Files.copy(), Guava or Commons IO, plus the closing and flushing rules.
Java InputStreamReader: Decode Bytes to Text With a Charset
Java InputStreamReader decodes bytes from an InputStream into characters. Learn charsets, read methods, malformed input, closing rules and alternatives.
OutputStream to InputStream in Java: Byte Array or Piped Streams
Convert OutputStream to InputStream in Java with ByteArrayOutputStream, piped streams in a second thread or a temp file, and avoid pipe deadlocks.
InputStream to String in Java: readAllBytes and More (Java 25)
Convert an InputStream to String in Java with readAllBytes, readAllAsString or BufferedReader, plus String to InputStream and StringReader examples.