标签：/*

字节流：

InputStream

OutputStream

*/

import java.io.*;

class FileStream

{

public static void main(String[] args) throws IOException

{

outputFile();

//inputFile_1();

inputFile_2();

}

/*不利用数组进行缓冲的方法*/

public static void outputFile() throws IOException //写

{

FileOutputStream fos=new FileOutputStream("D:\\myfile\\mycode\\4.txt");

fos.write("abndks你好".getBytes());

fos.close();

}

public static void inputFile() throws IOException//读

{

FileInputStream fis=new FileInputStream("D:\\myfile\\mycode\\4.txt");

int ch=0;

while((ch=fis.read())!=-1)

{

System.out.println((char)ch);

}

fis.close();

}

/*利用数组进行缓冲的方法进行读*/

public static void inputFile_1() throws IOException//读

{

FileInputStream fis=new FileInputStream("D:\\myfile\\mycode\\4.txt");

int num=0;

byte[] b=new byte[1024];

while((num=fis.read(b))!=-1)

{

System.out.println(new String(b,0,num));

}

fis.close();

}

/*使用字节流对象中特有的available获取字节个数。*/

public static void inputFile_2() throws IOException//读

{

FileInputStream fis=new FileInputStream("D:\\myfile\\mycode\\4.txt");

int num=fis.available();

byte[] b=new byte[num];

int x=fis.read(b);

System.out.println("x:"+x);

System.out.println("num:"+num);

System.out.println(new String(b));

fis.close();

}

}

复制图片：

/*

拷贝图片：

思路：

1，用字节读取流对象和图片关联。

2，用字节写入流对象创建一个图片文件，用于存储获取到的图片数据。

3，通过循环读写，完成数据的存储。

4，关闭资源。

*/

import java.io.*;

class CopyPic

{

public static void main(String[] args)

{

FileInputStream fis=null;

FileOutputStream fos=null;

try

{

System.out.println("1111");

fis=new FileInputStream("D:\\20.jpg");

System.out.println("2222");

fos=new FileOutputStream("C:\\test\\new.jpg");

System.out.println("3333");

byte[] b=new byte[1024];

int len=0;

while((len=fis.read(b))!=-1)

{

fos.write(b,0,len);

}

}

catch (IOException e)

{

throw new RuntimeException("复制文件失败");

}

finally

{

try

{

if(fis!=null)

fis.close();

}

catch (IOException e)

{

throw new RuntimeException("读取关闭失败");

}

try

{

if(fos!=null)

fos.close();

}

catch (IOException e)

{

throw new RuntimeException("写入关闭失败");

}

}

}

}

复制MP3文件，使用字节流缓冲区

/*

通过复制MP3媒体文件来使用缓冲区

*/

import java.io.*;

class CopyMp3

{

public static void main(String[] args)

{

long start=System.currentTimeMillis();

copy_1();

long end=System.currentTimeMillis();

System.out.println((end-start)+"毫秒");

}

public static void copy_1()

{

FileInputStream fis=null;

FileOutputStream fos=null;

BufferedInputStream bis=null;

BufferedOutputStream bos=null;

try

{

fis=new FileInputStream("D:\\CloudMusic\\Lonely.mp3");

fos=new FileOutputStream("D:\\myfile\\mycode\\new.mp3");

bis=new BufferedInputStream(fis);

bos=new BufferedOutputStream(fos);

int by=0;

while((by=bis.read())!=-1)

{

bos.write(by);

}

}

catch (IOException e)

{

throw new RuntimeException("复制失败");

}

finally

{

try

{

if(bis!=null)

bis.close();

}

catch (IOException e)

{

throw new RuntimeException("读取流关闭失败");

}

try

{

if(bos!=null)

bos.close();

}

catch (IOException e)

{

throw new RuntimeException("写入流关闭失败");

}

}

}

}

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