Beyond the Basics - TCP/IP Sockets in Java Practical Guide for Programmers - page 88

32

System.out.print("R"); // Reading progress indicator

33

}

34

System.out.println(); // End progress indicator line

35
36

sock.close(); // Close the socket and its streams

37

fileIn.close(); // Close file streams

38

fileOut.close();

39

}

40
41

private static void sendBytes(Socket sock, InputStream fileIn)

42 throws IOException {

43 OutputStream sockOut = sock.getOutputStream();

44 int bytesRead; // Number of bytes read

45 byte[] buffer = new byte[BUFSIZE]; // Byte buffer

46 while ((bytesRead = fileIn.read(buffer)) != −1) {

47 sockOut.write(buffer, 0, bytesRead);

48

System.out.print("W"); // Writing progress indicator

49

}

50

sock.shutdownOutput(); // Finished sending

51

}

52 }

CompressClient.java

1. Application setup and parameter parsing: lines 0-14

2. Create socket and open files: lines 16-21
3. Invoke sendBytes() to transmit bytes: lines 23-24
4. Receive the compressed data stream: lines 26-34
The while loop receives the compressed data stream and writes the bytes to the output
file until an end-of-stream is signaled by a − 1 from read() .
5. Close socket and file streams: lines 36-38

6. sendBytes() : lines 41-51
Given a socket connected to a compression server and the file input stream, read all of
the uncompressed bytes from the file and write them to the socket output stream.

Get socket output stream: line 43
Send uncompressed bytes to compression server: lines 44-49
The while loop reads from the input stream (in this case from a file) and repeats the
bytes to the socket output stream until end-of-file, indicated by − 1 from read() . Each

write is indicated by a “W” printed to the console.