java基础7 IO应用

IO应用

将文件夹中的图片copy到另一个文件夹中

import java.io.*;

public class Jpg {
    public static void main(String[] a) throws IOException {

        FileInputStream in = new FileInputStream("D:\\a\\123.jpg");
        FileOutputStream out = new FileOutputStream("D:\\b\\123.jpg");
        BufferedInputStream bufferedIn = new BufferedInputStream(in);
        BufferedOutputStream bufferedOut = new BufferedOutputStream(out);
        byte[] by = new byte[1];
        while (bufferedIn.read(by) != -1) {
            bufferedOut.write(by);
        }
        //将缓冲区中的数据全部写出
        bufferedOut.flush();
        bufferedIn.close();
        bufferedOut.close();

    }
}

将文件夹中txt的文字copy到另一个文件夹中的txt里面

import javax.imageio.IIOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Txt {
    public static void main(String[] args)throws Exception{
        try{
            FileInputStream fils = new FileInputStream("D:\\a\\三体.txt");
            FileOutputStream fos = new FileOutputStream("D:\\b\\三体.txt");
            int b=0;
            while((b=fils.read())!=-1){
                fos.write(b);
            }
            fos.close();
            fils.close();
        }catch (IIOException e){
            e.printStackTrace();
        }
    }
}