http://www.csdn.net/Develop/Article/23/23414.shtm
http://www.csdn.net/Develop/Article/23/23415.shtm
http://www.csdn.net/Develop/Article/23/23416.shtm
http://www.csdn.net/Develop/Article/23/23415.shtm
http://www.csdn.net/Develop/Article/23/23416.shtm
http://arbow.itocean.net/resource/java%20io.pdf