Designing of pre-stressed concrete with an internet based software

Studienarbeit von Michael Kollinger

Abstract:

The increasing interest in the Internet of the recent years results in a growing number of users as well as improved network infrastructure, quality and performance. This is the basis for a new kind of software, which is running via the Internet. That means the software is installed an a server connected to the Internet and accessed and executed by a remote client. Such Internet based software provides several benefits. Once distributed by a server, Internet based software is available world-wide and depending on its implementation it can be executed without previous installation on the client machine.

Further software updates and patches are not distributed to the users any more. Only the server has to be updated and the new version is available to all users immediately. For commercial use it is not necessary that customers buy the software any more, they download and pay only the module they need or they pay just for every access with the server application. It is also possible to place a high-performance or application specific computer at the server side and provide computation time for special tasks to the users.

Table of Contents:

	Abstract	1
	Chapter 1: Introduction	1
	Chapter 2: Project Objective	1
	Chapter 3: Methodology	2
3.1	An Overview of TCP/IP Protocols and the Internet	2
3.1.1	Definition of Internet	2
3.1.2	What is TCP/IP?	2
3.1.3	The TCP/IP Protocol Architecture	2
3.1.4	The Network Interface Layer	2
3.1.5	The Internet Layer	2
3.1.6	The Transport Layer Protocol (TCP)	3
3.1.7	The TCP/IP Application Layer	3
3.1.8	TCP/IP Paket	3
3.1.9	TCP/IP Transport Diagram	4
3.2	What are Ports?	4
3.3	What is a Socket?	4
3.4	Programming Languages	5
3.4.1	Advantages of Java	5
3.4.1.1	Java is Distributed	6
3.4.1.2	Java is Interpreted	6
3.4.1.3	Java is Architecture Neutral and Portable	6
3.4.2	Advantages of C++	6
3.4.2.1	C++ is High Performanced	6
3.4.2.2	C++ is Platform independent with QT	7
3.4.2.3	C++ is a popular Language	7
3.4.2.4	C++ is a powerful Language	7
3.4.3	Solution of our Task	7
	Chapter 4: Detail Description of the Program	8
4.1	Class Overview of the Program	8
4.1.1	UML Illustration of the Java Client	8
4.1.2	Detail Descriptionof the Java Client	8
4.1.2.1	AppletClient Class	8
4.1.2.2	NetClient Class	10
4.1.2.3	SocketOpener Class	10
4.1.2.4	ClientInputStream Class	10
4.1.2.5	ClientOutputStream Class	11
4.1.3	UML Illustration of the QT Server	11
4.1.4	Detail Descriptionof the QT Server	12
4.1.4.1	Main Application	12
4.1.4.2	NetServer Class	12
4.1.4.3	ServerSocket Class	12
4.1.4.4	ClientSocket Class	13
4.2	Data Handling	13
4.2.1	Data Handling Windows versus Unix (Little Endian - Big Endian)	13
4.2.2	Streams	14
4.2.2.1	What is a Stream?	14
4.2.2.2	Text Versus Binary Streams	14
4.2.2.3	Solution for our Task	14
4.2.3	Characters	15
4.2.3.1	ASCII	15
4.2.3.2	Unicode	15
4.2.3.3	UTF-8	15
4.2.4	Data Handling with Characters in Java	16
4.2.5	Data Handling with Characters in QT	17
4.2.6	Functions Overview: Sending Data from Java Client to QT Server	19
4.2.7	Functions Overview: Sending Data from QT Server to Java Client	20
	Chapter 5: Demonstration of the Result	21
5.1	Example	21
5.2	Input	23
5.3	Status Bar	24
	Chapter 6: Conclusions	25
6.1	Program before - after	25
6.2	Advantages	25
6.3	Disadvantages	25
	Chapter 7: Furtherwork	26
	References	27
	Appendix A: Implementation	27
	Appendix B: ASCII Character Codes	28
	Appendix C: Unicode Character Code	29
	Appendix D: ClientOutputStream Class Reference	30
	Appendix E: ClientInputStream Class Reference	38
	Sourcecode: AppletClient	48
	Sourcecode: QTServer	70