用I/O流实现文件的复制

 用DataInputStream完成文本，视频，音频的复制，其他流的代码类似

1，DataInputStream是高级流，所以要以低级流为基础，在构造方法中写入低级流的参数

  **注意：在复制音频，视频的时候，不能用字符流，因为会导致复制前后大小不一致

package com.hyxy.xiancheng;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDataInputStream {

	public static void main(String[] args) {
		//copyText();
		copyMusic();
	}
	
	//复制文本
	public static void copyText(){
		DataInputStream ds = null;
		DataOutputStream os = null;
		try {
			ds = new DataInputStream(new FileInputStream("bw.txt"));
			os = new DataOutputStream(new FileOutputStream("os.txt"));
			byte b [] = new byte[1024];
			int len = 0;
			while((len = ds.read(b))!=-1){
				os.write(b,0,len);
			}
		} catch (FileNotFoundException e) {
			
			e.printStackTrace();
		} catch (IOException e) {
			
			e.printStackTrace();
		}finally{
			try {
				ds.close();
			} catch (IOException e) {
			
				e.printStackTrace();
			}
			try {
				os.close();
			} catch (IOException e) {
				
				e.printStackTrace();
			}
		}
	}
	
	//复制音频
	public static void copyMusic(){
		DataInputStream ds = null;
		DataOutputStream os = null;
		try {
			ds = new DataInputStream(new FileInputStream("D:\\KuGou/Veela、Feint - Vagrant.mp3"));
			os = new DataOutputStream(new FileOutputStream("os1.mp3"));
			byte b [] = new byte[1024];
			int len = 0;
			while((len = ds.read(b))!=-1){
				os.write(b,0,len);
			}
		} catch (FileNotFoundException e) {
		
			e.printStackTrace();
		} catch (IOException e) {
			
			e.printStackTrace();
		}finally{
			try {
				ds.close();
			} catch (IOException e) {
			
				e.printStackTrace();
			}
			try {
				os.close();
			} catch (IOException e) {
			
				e.printStackTrace();
			}
		}
	}
}