Java重定向标准输入/输出

标准输出重定向

import java.io.FileOutputStream;  
import java.io.PrintStream;  
public class Test {  
    public static void main(String[] args) throws Exception  
    {  
          
        PrintStream ps=new PrintStream(new FileOutputStream("work"));  
        System.setOut(ps);  
        System.out.println("Hello World!");  
  
    }  
}  

标准输入重定向

import java.io.FileInputStream;  
import java.util.Scanner;  
  
  
public class cdx {  
    public static void main(String[] args) throws Exception  
    {  
        FileInputStream fis=new FileInputStream("work");  
        System.setIn(fis);  
          
        Scanner sc=new Scanner(System.in);  
        while(sc.hasNextLine())  
        {  
            System.out.println(sc.nextLine());  
        }  
    }
}