JAVA之字节缓冲流

老规矩，上一段代码：

工具类代码：

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
class IOUtil {
	
	public static void copyByBuf(String filename1,String filename2) throws IOException{
		File afile= new File(filename1);
		File bfile=new File(filename2);
		FileInputStream ain=new FileInputStream(afile);
		FileOutputStream aout=new FileOutputStream(bfile);
		BufferedInputStream input =new BufferedInputStream(ain);
		BufferedOutputStream output=new BufferedOutputStream(aout);
		int  a;
		while((a= input.read())!=-1){
			output.write(a);
		}output.flush();
		input.close();
		output.close();
	}
}

主类代码：

import java.io.File;
import java.io.IOException;


public class RandomAccessFileTest {
	public static void main(String[] args) throws IOException{
		File afile=new File("employee.txt");
		if(!afile.exists())
			afile.createNewFile();
		long start=System.currentTimeMillis();
		IOUtil.copyByBuf("F:\\大家的声音\\佳.mp3","F:\\大家的声音\\佳1.mp3");
		long end=System.currentTimeMillis();
		System.out.println("耗时="+(end-start)+"毫秒");
	}
}

输出结果：