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    1.
    try
{
FileInputStream in=new FileInputStream("C:/1.txt");
FileOutputStream out=new FileOutputStream("C:/2.txt");
byte[] by=new byte[1024];
do {
in.read(by, 0, 1024);
out.write(by);
} while (in.available()>0);
in.close();
out.close();
}catch(ArrayIndexOutOfBoundsException e)
{
e.printStackTrace();
}catch(IOException e)
{
e.printStackTrace();
}
   2.
try {
FileInputStream in=new FileInputStream("C:/1.txt");
FileOutputStream out= new FileOutputStream("C:/2.txt");
BufferedInputStream bufferedIn=new BufferedInputStream(in);
BufferedOutputStream bufferedOut=new BufferedOutputStream(out);
byte[] by=new byte[1];
while (bufferedIn.read(by)!=-1) {
bufferedOut.write(by);
}
//½«»º³åÇøÖеÄÊý¾ÝÈ«²¿Ð´³ö
bufferedOut.flush();
bufferedIn.close();
bufferedOut.close();

} catch (ArrayIndexOutOfBoundsException e) {
// TODO: handle exception
e.printStackTrace();
}catch (IOException e) {
// TODO: handle exception
e.printStackTrace();
}