zhanglm

测试环境：双核1.6G，内存2G，jdk1.5.0_13，windows xp，用于测试的文件大小为40728KB.
1.ByteBuffer
测试代码1

 FileInputStream fis=new FileInputStream("D:/NetworkWideAgent.war");
        FileOutputStream fos=new FileOutputStream("D:/NetworkWideAgent1.war");
        
       
    
        long start=System.currentTimeMillis();
        
        FileChannel inChannel=fis.getChannel();
        FileChannel outChannel=fos.getChannel();
        ByteBuffer byteBuffer=ByteBuffer.allocate(1024);
        while (true)
        {
            byteBuffer.clear();
            int cnt=inChannel.read(byteBuffer);
            if(cnt<0) break;
            byteBuffer.flip();
            outChannel.write(byteBuffer);
        }
        System.out.println("task time="+(System.currentTimeMillis()-start));
        fis.close();
        fos.close();

2.direct ByteBuffer
测试代码2

 FileInputStream fis=new FileInputStream("D:/NetworkWideAgent.war");
        FileOutputStream fos=new FileOutputStream("D:/NetworkWideAgent4.war");
        
       
    
        long start=System.currentTimeMillis();
        
        FileChannel inChannel=fis.getChannel();
        FileChannel outChannel=fos.getChannel();
        ByteBuffer byteBuffer=ByteBuffer.allocateDirect(1024);
        while (true)
        {
            byteBuffer.clear();
            int cnt=inChannel.read(byteBuffer);
            if(cnt<0) break;
            byteBuffer.flip();
            outChannel.write(byteBuffer);
        }
        System.out.println("task time="+(System.currentTimeMillis()-start));
        fis.close();
        fos.close();

3.普通的IO
测试代码3

FileInputStream fis=new FileInputStream("D:/NetworkWideAgent.war");
        FileOutputStream fos=new FileOutputStream("D:/NetworkWideAgent4.war");
        
       
    
        long start=System.currentTimeMillis();
        byte[] buffer=new byte[1024];
        while (true)
        {
            int cnt=fis.read(buffer);
            if(cnt<0) break;
            fos.write(buffer,0,cnt);
        }
        System.out.println("task time="+(System.currentTimeMillis()-start));
        fis.close();
        fos.close();

分别的测试结果为(单位：ms)
ByteBuffer
1.719
2.656
3.640
4.657
direct ByteBuffer
1.859
2.593
3.610
4.640
平常IO.
1.625
2.594
3.531
4.562

当缓冲大小由原来的1024设置为10240时的测试结果为(单位：ms)
ByteBuffer
1.562
2.484
3.531
4.500
direct ByteBuffer
1.453
2.484
3.469
4.453
平常IO.
1.438
2.453
3.610
4.531