Write To A URL And Communicate With A Host Server

The java.net.URL is the package we use to read from and write to existing web pages. I have a Java program that imports the java.net.URL and reads and extracts some information from web pages. However, it is only the latter half of the task.
How does a Java program interact with; for example, cgi-bin scripts, on the server side provide that I have no idea about the contents of the cgi-bin scripts?
What I mean is that:
Many HTML pages contain forms-- text fields and other GUI objects that let us enter data to send to the server. After we type in the required information and initiate the query by clicking a button, the Web browser writes the data to the URL over the network. At the other end, a cgi-bin script (usually) on the server receives the data, processes it, and then sends us "a response", usually in the form of a new HTML page. As I stated in the beginning of this post, I have prepared a Java program to read the responding HTML page.
My question is regarding the first half of the process. How do I feed data in my Java program that initiate the query (instead of manually entering data in the text field) over the network for the host server to process? And then the Java program continues its work in reading the HTML page returned by the server? Provided that I do not know what kind of the program the hosting server uses to process the query.

This is my problem. I do not have any idea about the program on the hosting server that processes the query and returns to output HTML webpage. I mentioned "cgi" just to give an example. Not to mention whether the program on the hosting server uses "GET" or "POST".
Usually, we go to; for example, http://www.yahoo.com, and fill out its text field to make a query and then the yahoo returns a HTML page in response to our query.
My task is to write a Java program to communicate with http://www.yahoo.com. I have to submit the query string in my Java program. I have no idea about what yahoo uses to process my query and my Java program must scan the HTML web page returned by the yahoo to pick up certain information from that page.

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sorry, my english isn't very well...

sorry, it's not the same error. The output is: Unable to connect to any host due to exception: java.net.socket.exception: java.net.socket.exception: Unregcognized windows socket error: 10106: create.

Write To A URL And Communicate With A Host Server

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