IO流----BufferedInputStream与BufferedOutputStream实现文件复制

BufferedInputStream与BufferedOutputStream实现文件复制

BufferedInputStream-----字节缓冲输入流
BufferedOutputStream----字节缓冲输出流

BufferedInputStream使用方法

public class IODemo4 {
    public static void main(String[] args) {
        try {
            //1.水厂(F:\20210803.txt)
            InputStream in = new FileInputStream("F:\\20210803.txt");
            //2.铺设管道
            BufferedInputStream bis = new BufferedInputStream(in);
            //3.开水龙头
            //创建一辆车  1024
            byte[] car = new byte[1024];
            int len = 0;
            while ((len = bis.read(car)) != -1) {
                System.out.println(len);
            }
            bis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

文件复制

现在有一个需求，需要将F:\20210803.txt文件的内容复制到F盘，并命名F:\20210805.txt，具体实现流程如下：

代码实现

import java.io.OutputStream;

/**
 * BufferedOutputStream---字节缓冲输出流
 */
public class IODemo5 {
    public static void main(String[] args) {
        try {
            //1.水厂(F:\20210803.txt)
            InputStream in = new FileInputStream("F:\\20210803.txt");
            //2.铺设管道
            BufferedInputStream bis = new BufferedInputStream(in);
            File file;
            OutputStream os = new FileOutputStream("F:\\10210805.txt");
            BufferedOutputStream bos = new BufferedOutputStream(os);
            //3.开水龙头
            //创建一辆车  1024
            byte[] car = new byte[1024];
            int len = 0;
            while ((len = bis.read(car)) != -1) {
                bos.write(car,0,len);
            }
            bis.close();
            bos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}