http:/coursework.lxws.net 留学生论文专业定制代写网站留学生Essay写作Java和蓝牙技术INTRODUCTION1.1 Project BackgroundWireless technologies are becoming more and more popular around the world. Consumers appreciate the wireless lifestyle,relieving them of the well known“cable chaos”that tends to grow under their desk.Nowadays,the world would virtually stop if wireless communications suddenly became unavailable.Both our way of life and the global economy are highly dependent on the flow of information through wireless mediums like television and radio.Cell phones have become highly available during the last decade.Now virtually everyone owns a cell phone,making people available almost wherever they are.Many companies are highly dependent on their employees having cell phones,some companies have even decided not to employ stationary phone systems but instead use cell phones exclusively throughout the organization.New wireless technologies are introduced at an increasing rate.During the last few years the IEEE 802.11 technologies have started to spread rapidly,enabling consumers to set up their own wireless networks.This constitutes an important change in how wireless communications are made available to consumers.Wireless networks are no longer provided by big corporations alone,they can just as well be implemented by individuals.Our society is becoming more and more dependent on wireless communications as new areas of use are introduced.The Bluetooth wireless technology is also spreading rapidly.The number of Bluetooth chipsets shipped per year has doubled from 2002 to a total of 69 million chipsets in 2003.The majority of these Bluetooth chipsets are used in mobile phones.An interesting aspect is that consumers are highly dependent on having a cell phone,and the Bluetooth technology is included in the majority of new cell phones.The Bluetooth technology will therefore spread because of the general need for cell phones.As an increasing number of useful Bluetooth applications become available,many consumers will already have Bluetooth devices and be ready to start using Bluetooth PANs(Personal Area Networks)where all their Bluetooth devices communicate with one another.The number of Java enabled mobile phones worldwide is over 250 million and the number of Java enabled mobile phones will continue to increase. Java enabled mobile phones have already been on the market for some years.Due to the very resource constrained mobile phones available a few years ago,Java applications were not very sophisticated and did not hit the mass-market the way many had hoped.As seen in the rest of the software and hardware industry,games play an important role in driving the development of both hardware and software forward.It is therefore interesting to see that a large market has emerged lately for Java games targeting mobile devices.Processing power,available memory,screen size, and screen resolution are increasing as new Java enabled mobile devices enter the market.Newly released Java applications are accordingly sophisticated,and will help to spread the Java technology usage even further.The Java APIs for Bluetooth Wireless Technology(JABWT)ties the Java technology and the Bluetooth technology together.JABWT is made available in some of the latest smart phones and will probably be available also in low-end cell phones in the future.One can easily imagine different scenarios where JABWT would be useful,e.g.the functionality of existing Java games is extended to support multi-player games using Bluetooth connectivity.Other interesting scenarios emerge as well,such as a consumer using a Java Bluetooth enabled mobile phone to pay for a soda by connecting to a Bluetooth enabled soda vending-machine.A good prediction is that JABWT will first find its use in multi-player Java games,making the Java and Bluetooth technologies well-known to consumers. Thereafter we will probably see other types of Java Bluetooth applications, such as small-amount payment applications.This thesis gives a broad overview of Java and Bluetooth technologies,and a mobile peer-to-peer application that allows users to share their files such as text,images music within a small Bluetooth network in a synchronized way.1.2 Aim of the ProjectThis project is designed to develop a personalized mobile file sharing system that allow users to share their resources without the aid of any central server.1.3 Motivation of the ProjectWith the availability of peer-to-peer mobile services operating on content sets,the need for a personalized file sharing Application rises. This project overcomes the requirements specified above by designing a personalized file sharing system that not only allows people to share files to the strangers in a mobile peer-to-peer mobile network,but also identifies the secure mobile devices in an“ad-hoc mobile social network”which allows people to share and personalize the file sharing experience with the strangers in the n