Tutorial week 3

• Write a TCP DayTime server. Try to get your client to work with someone-else's server and vice versa
• Modify the concurrent Echo server to log all messages sent to it, recording the hostname and message. Hint: use a PrintStream object (which uses a File object) which is shared by all threads, and use this object to synchronise writes
• The time protocol (IETF RFC 868, http://www.faqs.org/rfcs/rfc868.html) returns the elapsed time as a 32-bit integer, which is the number of seconds since 1 January, 1900. The specification gives the time as a signed integer. No implementation has ever followed this specification as they all return a 32-bit unsigned integer.
  • If a signed integer was returned, what is the last date that could be given?
  • Write a client to access this service. This service should be running on port 37 of jan.newmarch.name
• Discuss how to serialize the following:
  • An array of positive and negative integers
  • An array of positive integers
• A variable length array of strings (with no embedded newlines) can be serialized by
  • Printing the number of strings, and then printing each string on a newline
  • Printing each string on a newline, and then terminating the list with a blank line
  Write Java code to write an array of strings from a server to a client, using both representations. What modifications can you make to these representations to handle the case where the strings may have embedded newline characters?