i need full source code in java implementing the HTTP SERVER. major methods like GET, HEAD and POST should be implemented.

The term "Web server" often refers only to the HTTP server software in the machine, which provides the Web site functionality. HTTP is the protocol of the Web, and HTTP server software, such as Microsoft's IIS and the open source Apache server, accepts requests from the user's browser and responds by sending back HTML documents (Web pages) and files.
The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards.

Web servers are computers that provide web pages. Each Web server has an IP address, may be a domain name. Web server can be achieved to the operating system kernel, or in user space. Any computer into a Web server can be installed on the server software and the computer connected to the Internet.