http://www.rgagnon.com/javadetails/java-0014.html

 

Windows rundll32 utility

Windows File association Any program using the Windows file association mechanism can be started with the rundll32 utility. // "file" is the filename of the data file //  ex. myresume.doc //  to start Word if the doc extension is associated with it. Runtime.getRuntime().exec   ("rundll32 SHELL32.DLL,ShellExec_RunDLL " + file.getAbsolutePath());

 

PDF (Windows only)

public class ShowPDF {   public static void main(String[] args) throws Exception {     Process p =       Runtime.getRuntime()         .exec("rundll32 url.dll,FileProtocolHandler c:/pdf/mypdf.pdf");     p.waitFor();     System.out.println("Done.");   } }

SyncPipe

 

java.nio.channels.FileChannel

任何时间只有一个线程在执行操作。

可以锁定局部文件区域。

对巨大文件，载入一部分。便利操作。

方便，操作系统优化载体直接写，加速读写速度。

复写、扩增、缩减，文件尺寸。