关于java中文件输入输出流的问题

import java.io.*;

public class FileDemo {

	public static void main (String[]args){

		File source = new File("e:/test1/java.doc");

		File target = new File("e:/test2/java.doc");

		FileInputStream fis=null;

		FileOutputStream fos=null;

		try{

			fis =new FileInputStream(source);

			fos =new FileOutputStream(target);

		    byte[] bytes =new byte[1024];

		    int length;

		    while((length=fis.read(bytes))!=-1){

		    	String str = new String(bytes,0,length);

		    	System.out.println(str);

		    	

		    	byte[] by = str.getBytes();

		    	fos.write(by);

		    }

		}catch(FileNotFoundException e){

			e.printStackTrace();

		}catch(IOException e){

			e.printStackTrace();

		}finally{

			if(fis != null){

				try{

					fis.close();

				}catch (IOException e){

					e.printStackTrace();

				}

			}

			if (fos != null){

				try{

					fos.close();

				}catch (IOException e){

					e.printStackTrace();

				}

			}

		}

		

		

	}



}