import java.io.*; public class PrintStreamDemo{ public static void main(String[] args)throws IOException  {  try  {   FileInputStream fis = new FileInputStream (FileDescriptor.in);//指定输入流为键盘   PrintStream ps = new PrintStream (new FileOutputStream ("D://testfile//file.log"), true);   int is;   while ((is=fis.read()) != -1)ps.println((char)is);   fis.close();   ps.close();  }  catch(FileNotFoundException e)  {   System.out.println(e);  }  catch(IOException e)  {   System.out.println(e);  }  catch(Exception e)  {   System.out.println(e);  } }}

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