Big Java example project "post"

You can use this project as follows:

 - This program posts a query to a United States Postal Service
   server that can look up the ZIP code for a city name.
 - invoke the main method of the driver class PostZipQuery by 
 right-clicking on the class representation and selecting the main method.
 - you will need to provide a city name and an optional state.
 - in BlueJ you provide arguments to the main method by initialising a String 
 array as the parameter to the main method.  For example:  
    {"Los Angeles,", "CA"}
 
This project illustrates concepts covered in Big Java, Chapter 22 
"Internet Networking".
  
 - to understand the concept of sockets
 - to learn how to send and receive data through sockets
 - to implement network clients and servers
 - to communicate with web servers and server-side applications through Hypertext Transfer Protocol (HTTP)

