我的家园

 
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;

public class Redirecting {

    public static void main(String[] args) throws IOException {
        PrintStream console = System.out;
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(new File("src/com/io/Redirecting.java").getAbsolutePath()));
        PrintStream out = new PrintStream(new BufferedOutputStream(new FileOutputStream(new File("src/com/io/").getAbsolutePath() +"/test.out")),true);//第二个参数很重要
        System.setIn(in);
        System.setOut(out);
        System.setErr(out);
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String s;
        while((s = reader.readLine())!= null){
            System.out.println(s);
            out.close();
            System.setOut(console);
        }
    }
}