合并流/SequenceInputStream

 可以把如 a.txt b.txt c.txt等多个文件复制到d.txt文件

构造方法:

SequenceInputStream(Enumeration e)

 

Enumeration是Vector中的一个方法的返回值类型

Enumeration<E> elements()

 

代码

package cn.idcast2;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;/* * 需求：把Day1.java、Day102.java、Day103.java复制到d.txt里。 *  */public class SequenceInputStreamdemo {	public static void main(String[] args) throws IOException {		Vector
     
       v = new Vector
      
       ();		InputStream ips1 = new FileInputStream("Day1.java");		InputStream ips2 = new FileInputStream("Day102.java");		InputStream ips3 = new FileInputStream("Day103.java");		v.add(ips1);		v.add(ips2);		v.add(ips3);		Enumeration
       
         en = v.elements();		SequenceInputStream sis = new SequenceInputStream(en);		BufferedOutputStream bos = new BufferedOutputStream(				new FileOutputStream("d.txt"));		byte[] bys = new byte[1024];		int len = 0;		while ((len = sis.read(bys)) != -1) {			bos.write(bys, 0, len);		}		sis.close();		bos.close();	}}