java IO重定向

java IO重定向

 

package aaa;

import java.io.*;

public class Redirecting
{
 public static void main(String[] args)throws IOException
 {
  BufferedInputStream in =new BufferedInputStream(new FileInputStream("D:/log.log"));
  PrintStream out = new PrintStream(new BufferedOutputStream(new FileOutputStream("test.out")));
  System.setIn(in);
  System.setOut(out);
  System.setErr(out);
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  String s;
  while((s=br.readLine())!=null)
   System.out.println(s);
  out.close();
 }
}