Java-字节输入输出。（新手）

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参考手册：

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BufferedInputStream

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BufferedOutputStream

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实例：

import java.io.*;
/*
 *  文件的复制方式
 *  1 字节流读写单个字节
 *  2 字节流读写字节数组
 *  3 字节流缓冲区 读写单个字节
 *  4 字节流缓冲区读写字节数组
 */
public class Zjsrsclx {
    public static void main(String[] args) throws Exception {
        long e = System.currentTimeMillis();
        File src = new File("D:\ja.txt");
        File dasc = new File("C:\ja.txt");
        long c = System.currentTimeMillis();
        System.out.println(e-c);
        lx4(src,dasc);
    }

    private static void lx4(File src, File dasc) throws Exception {
        // 4 字节流缓冲区读写字节数组
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(src));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(dasc));
        byte[] b = new byte[1024*10];
        int len = 0;
        while((len = bis.read(b))!=-1){
            bos.write(b,0,len);
        }
        bis.close();
        bos.close();
    }

    private static void lx3(File src, File dasc) throws Exception {
        //3 字节流缓冲区 读写单个字节
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(src));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(dasc));
        int len = 0;
        while((len = bis.read())!=-1){
            bos.write(len);
        }
        bis.close();
        bos.close();
    }

    private static void lx2(File src, File dasc) throws Exception {
        //2 字节流读写字节数组
        FileInputStream fis = new FileInputStream(src);
        FileOutputStream fos = new FileOutputStream(dasc);
        int len = 0;
        byte[] b = new byte[1024*10];
        while ((len = fis.read(b))!=-1){
            fos.write(b,0,len);
        }
        fis.close();
        fos.close();
    }

    private static void lx1(File src,File dasc) throws Exception {
        //1 字节流读写单个字节
        //复制粘贴文件。
        FileInputStream fis = new FileInputStream(src);
        FileOutputStream fos = new FileOutputStream(dasc);

        int len = 0;
        while ((len = fis.read())!=-1){
           fos.write(len);
        }
        fis.close();
        fos.close();
    }

}

 

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打印结果：

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lx1:

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lx2:

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lx3:

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lx4: