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 picturepublic 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 mp3import 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();    }}