演示BufferedOutputStream和BufferedInputStream

1. buffer

处理字节：

(1)bufferInputStream

(2)bufferOutputStream

使用它们，可以完成二进制文件拷贝，也可以操作文本文件

package com.io.outputstream_;

import java.io.*;

/**
 * 演示BufferedOutputStream和BufferedInputStream.关闭时也只需关闭外层的处理流，底层节点流会自动关闭
 */
public class BufferedCopy02 {
    public static void main(String[] args) {
        String srcPath="d:\\cat.jpg";
        String destPath="d:\\cat3.jpg";
        BufferedInputStream bis=null;
        BufferedOutputStream bos=null;
        //创建BufferedOutputStream对象和BufferedInputStream对象
        try {
            //因为FileInputStream是InputStream子类
            bis=new BufferedInputStream(new FileInputStream(srcPath));
            bos=new BufferedOutputStream(new FileOutputStream(destPath));

            //循环读取文件，并写入到destPath
            byte[] buff=new byte[1024];
            int readLen=0;
            //当返回-1时表示文件读取完毕
            while ((readLen=bis.read(buff))!=-1){
                bos.write(buff,0,readLen);

            }
            System.out.println("文件拷贝完毕");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (bis!=null){
                    bis.close();
                }
                if (bos!=null){
                    bos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}