자바 NIO http://javacan.tistory.com/entry/73 http://javacan.tistory.com/entry/77 http://javacan.tistory.com/entry/87 http://download.oracle.com/javase/1.4.2/docs/api/java/nio/package-summary.html http://www.ibm.com/developerworks/kr/library/j-javaio/index.html