http://www.java3z.com/cwbwebhome/article/article5a/532.html

    重定向标准流

       

             

    下载源代码

    〖 作者：站长整理 〗〖 大小：1k 〗〖 发布日期：2005-08-04 〗〖 浏览：145 〗

     import java.io.*;

    public class Redirect

    {

        public static void main (String args[])

        {

    InputStream origIn = System.in;

    PrintStream origOut = System.out;

    PrintStream origErr = System.err;

    InputStream stdin = null;

    try

        {

        stdin = new FileInputStream ("Redirect.in");

        }

    catch (Exception e)

        {

        System.exit (1);

        }    

    // Create a new output stream for the standard output.

    PrintStream stdout = null;

    try

        {

        stdout = new PrintStream (

    new FileOutputStream ("Redirect.out"));

        }

    catch (Exception e)

        {

        // Sigh.  Couldn't open the file.

        System.exit (1);

        }

    // Create new output stream for the standard error output.

    PrintStream stderr = null;

    try

        {

        stderr = new PrintStream (

    new FileOutputStream ("Redirect.err"));

        }

    catch (Exception e)

        {

        // Sigh.  Couldn't open the file.

        System.exit (1);

        }

            origOut.println ("\n11111111");

            System.out.println ("22222222222222");

            origOut.println ("333333");

            System.err.println ("4444444444444444444");

            origErr.println ("55555555555555");

    // Set the System out and err streams to use our replacements.

    System.setIn ( stdin );//重定向标准输入流

    System.setOut ( stdout );//重定向标准输出流

    System.setErr ( stderr );//重定向错误流

            origOut.println ("\666666666666666666");

            System.out.println ("aaaaaaaaaaaaaa");

            origOut.println ("777777777777");

            System.err.println ("bbbbbbbbbbbbb");

            origErr.println ("99999999999999999999999");

    // Read some input and dump it to the console.

            origOut.println ("\n11111111111111111111111");

    int inChar = 0;

    while (-1 != inChar)

        {

        try

    {

    inChar = System.in.read();

    }

        catch (Exception e)

    {

    // Clean up the output and bail.

    origOut.print ("\n");

    break;

    }

        origOut.write (inChar);

        }

    // Close the streams.

    try

        {

        stdin.close ();

        stdout.close ();

        stderr.close ();

        }

    catch (Exception e)

        {

        origOut.println ("Redirect:  Unable to close files!");

        System.exit (1);

        }

    System.exit (0);

        }

    }