运用BufferedInputStream和BufferedOutputStream实现文件内容的复制，中间可以使用用一个byte数组作为缓冲。

package shiyan4;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


public class BufferedInOutputStream {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 BufferedInputStream bis = null;  
	     BufferedOutputStream bos = null;  
	        try {  
	        	//创建文件对象
	            File file1 = new File("F:\\src1.txt");  
	            File file2 = new File("F:\\\\dest2.txt");  
	             //创建流对象
	            FileInputStream fis = new FileInputStream(file1);  
	            FileOutputStream fos = new FileOutputStream(file2);  
	            //缓存区  
	            bis = new BufferedInputStream(fis);  
	            bos = new BufferedOutputStream(fos);  	              
	            byte[] b = new byte[1024];  
	            int len=0;  
	            while((len = bis.read(b)) != -1){  
	                bos.write(b, 0, len);  
	            }  

	        } catch (FileNotFoundException e) {  
	            e.printStackTrace();  
	        } catch (IOException e) {  
	            e.printStackTrace();  
	        }finally{  
	        	//关闭流
	            if(bis != null){  
	                try {  
	                    bis.close();  
	                } catch (IOException e) {  
	                    e.printStackTrace();  
	                }  
	            }  
	            if(bos != null){  
	                try {  
	                    bos.close();  
	                } catch (IOException e) {  
	                    e.printStackTrace();  
	                }  
	            }  
	        }  
	}

}