IO流--复制picture ,mp3

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.LineNumberReader;
import java.nio.Buffer;

//copy picture
public class io {
    public static void main(String[] args) throws IOException
    {
        FileOutputStream fos = null;
        FileInputStream fis = null;
        try {
            fis = new FileInputStream("e:\\4.jpg"); //源文件
            fos = new FileOutputStream("e:\\5.jpg"); //复制后的文件
            
            byte[] buf = new byte[1024];
            int len = 0;
            while((len=fis.read(buf))!=-1)
            {
                fos.write(buf,0,len);
            }
            
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException("复制文件失误");
        }
        finally
        {
            try {
                if(fis!=null)
                    fis.close();
            } catch (Exception e2) {
                // TODO: handle exception
                throw new RuntimeException("读取关闭失败");
            }
            try {
                if(fos!=null)
                    fos.close();
            } catch (Exception e2) {
                // TODO: handle exception
                throw new RuntimeException("复制关闭失败");
            }
        }
        
    }

    
}

//copy mp3

import java.io.*;

public class io {
    public static void main(String[] args) throws IOException
    { 
        //得到当前的时间
        long start = System.currentTimeMillis();
        copy_mp3();
        long end = System.currentTimeMillis();
        System.out.println((end-start)+"毫秒");
    }
    public static void copy_mp3() throws IOException
    {
        BufferedInputStream bufis = new BufferedInputStream(new FileInputStream("e:\\1.mp3"));
        BufferedOutputStream bufos = new BufferedOutputStream(new FileOutputStream("e:\\2.mp3"));
        
        int by = 0;
        while((by = bufis.read())!=-1)
        {
            bufos.write(by);
        }
        bufis.close();
        bufos.close();
    }

}