java的I/O操作：文件的路径

package solutions;

import java.io.*;

/**
 * Created by Administrator on 2016/3/14.
 */
public class Redirecting{
    public static void main(String[] args) throws IOException {
        PrintStream console = System.out;
        //其中file的相对路径是当前项目下
        File file=new File("src/solutions/hu.txt");
        FileInputStream fileInputStream=new FileInputStream(file);
        BufferedInputStream in = new BufferedInputStream(fileInputStream);
        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();
        System.setOut(console);
    }
}