修改标准输入输出流拷贝图片(了解)

修改标准输入输出流拷贝图片(了解)

package com.heima.test;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;

public class Test02 {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		System.setIn(new FileInputStream("双元.jpg"));			//改变标准输入流
		System.setOut(new PrintStream("copy.jpg")); 			//改变标准输出流
		
		InputStream is = System.in;
		PrintStream ps = System.out;
		
		byte[] arr = new byte[1024];
		int len;
		
		while((len = is.read(arr)) != -1) {
			ps.write(arr, 0, len);
		}
		
		is.close();
		ps.close();
	}
}

来源：CSDN

作者：左绍骏

链接：https://blog.csdn.net/LeoZuosj/article/details/104116796