Reader/Writer与InputStream/OutputStream的区别

1. Readers and writers are like input streams and output streams. The primary difference lies in the
fundamental datatype that is read or written; streams are byte-oriented, whereas readers and
writers use characters and strings.

2. The reason for this is internationalization. Readers and writers were designed to allow programs
to use a localized character set and still have a stream-like model for communicating with
external devices.

3. These are analogous to the read( ) methods defined for InputStream. For example, read( )
still returns an integer. The difference is that, instead of data values being in the range of 0-255
(i.e., single bytes), the return value is in the range of 0-65535 (appropriate for characters, which
are 2 bytes wide).

4. Instead, readers and writers can be used as a layer on top of streams™ most readers have a
constructor that takes an InputStream as an argument, and most writers have a constructor
that takes an OutputStream as an argument.

FileOutputStream destination = new FileOutputStream(fileName);
BufferedOutputStream bufferedDestination = new BufferedOutputStream(destination);
GZIPOutputStream zippedDestination = new GZIPOutputStream(bufferedDestination);
OutputStreamWriter destinationWriter = new OutputStreamWriter(zippedDestination);