复制多个文件到一个文件中

复制多个文件到一个文件中

import java.io.BufferedOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.SequenceInputStream;

import java.util.Enumeration;

import java.util.Vector;

 

/*

 * 以前的操作：

 *a.txt -- b.txt

 *c.txt -- d.txt

 *e.txt -- f.txt

 *

 * 现在想要：

 *a.txt+b.txt+c.txt -- d.txt

 */

public class SequenceInputStreamDemo2 {

         publicstatic void main(String[] args) throws IOException {

                   //需求：把下面的三个文件的内容复制到Copy.java中

                   //ByteArrayStreamDemo.java,CopyFileDemo.java,DataStreamDemo.java

 

                   //SequenceInputStream(Enumeration e)

                   //通过简单的回顾我们知道了Enumeration是Vector中的一个方法的返回值类型。

                   //Enumeration<E> elements()

                   Vector<InputStream>v = new Vector<InputStream>();

                   InputStreams1 = new FileInputStream("a.txt");

                   InputStreams2 = new FileInputStream("b.txt");

                   InputStreams3 = new FileInputStream("c.txt");

                   v.add(s1);

                   v.add(s2);

                   v.add(s3);

                   Enumeration<InputStream>en = v.elements();

                   SequenceInputStreamsis = new SequenceInputStream(en);

                   BufferedOutputStreambos = new BufferedOutputStream(

                                     newFileOutputStream("d.txt"));

 

                   //如何写读写呢，其实很简单，你就按照以前怎么读写，现在还是怎么读写

                   byte[]bys = new byte[1024];

                   intlen = 0;

                   while((len = sis.read(bys)) != -1) {

                            bos.write(bys,0, len);

                   }

 

                   bos.close();

                   sis.close();

         }

}