Java输入输出流复制文件所用时间对比

废话不多说，关键代码如下所述：

package com.edu.xynu; 
import java.io.bufferedinputstream; 
import java.io.bufferedoutputstream; 
import java.io.file; 
import java.io.fileinputstream; 
import java.io.fileoutputstream; 
import java.io.ioexception; 
public class iounitcopy { 
//按字节 
public static void copybybyte(file srcfile,file destfile) throws ioexception{ 
fileinputstream fis=new fileinputstream(srcfile); 
fileoutputstream fos=new fileoutputstream(destfile); 
int i; 
while((i=fis.read())!=-1){ 
fos.write(i); 
} 
fis.close(); 
fos.close(); 
} 
//按字节数组 
public static void copybybytearray(file srcfile,file destfile) throws ioexception{ 
fileinputstream fis=new fileinputstream(srcfile); 
fileoutputstream fos=new fileoutputstream(destfile); 
byte []buf=new byte[10*1024]; 
int i; 
while((i=fis.read(buf, 0, buf.length))!=-1){ 
fos.write(buf, 0, i); 
} 
fis.close(); 
fos.close(); 
} 
//字节缓冲流 
public static void copybybuff(file srcfile,file destfile) throws ioexception{ 
bufferedinputstream bis=new bufferedinputstream(new fileinputstream(srcfile)); 
bufferedoutputstream bos=new bufferedoutputstream(new fileoutputstream(destfile)); 
int i; 
while((i=bis.read())!=-1){ 
bos.write(i); 
} 
bos.flush(); 
bis.close(); 
bos.close(); 
} 
//字节数组批量读取 缓冲输出流写入 
public static void copybybuffarray(file srcfile,file destfile) throws ioexception{ 
fileinputstream bis=new fileinputstream(srcfile); 
bufferedoutputstream bos=new bufferedoutputstream(new fileoutputstream(destfile)); 
byte [] buf=new byte[10*1024]; 
int len; 
while((len=bis.read(buf,0,buf.length))!=-1){ 
bos.write(buf,0,len); 
} 
bos.flush(); 
bis.close(); 
bos.close(); 
} 
} 
package com.edu.xynu; 
import java.io.file; 
import java.io.ioexception; 
public class iounitscopytest { 
public static void main(string[] args) { 
// todo auto-generated method stub 
try { 
long start=system.currenttimemillis(); 
// iounitcopy.copybybyte(new file("c:\\1.mp3"), new file( 
// "c:\\2.mp3"));//90713ms 
// iounitcopy.copybybytearray(new file("c:\\1.mp3"), new file( 
// "c:\\3.mp3"));//41ms 
// iounitcopy.copybybuff(new file("c:\\1.mp3"), new file( 
// "c:\\4.mp3"));//556ms 
// iounitcopy.copybybytearray(new file("c:\\1.mp3"), new file( 
// "c:\\5.mp3"));//30ms 
long end=system.currenttimemillis(); 
system.out.println(end-start); 
} catch (ioexception e) { 
// todo auto-generated catch block 
e.printstacktrace(); 
} 
} 
}

测试文件是