IO流_SequenceInputStream(序列流)

SequenceInputStream(序列流):就是将多个流合成一个有序的流

 

需求：将三个文件中的数据合并到一个文件中

 1 import java.io.FileInputStream;
 2 import java.io.FileOutputStream;
 3 import java.io.IOException;
 4 import java.io.SequenceInputStream;
 5 import java.util.Enumeration;
 6 import java.util.Vector;
 7 
 8 public class SequenceInputStreamDemo {
 9     public static void main(String[] args) throws IOException {
10         
11         //该集合效率低，所以用ArrayList集合，但是该集合没有枚举，所以要自定义一个枚举
12         Vector<FileInputStream> v = new Vector<FileInputStream>();
13         
14         v.add(new FileInputStream("F:\\0.txt"));
15         v.add(new FileInputStream("F:\\a.txt"));
16         v.add(new FileInputStream("F:\\info.txt"));
17         
18         Enumeration<FileInputStream> en = v.elements();
19         
20         SequenceInputStream sis = new SequenceInputStream(en);
21         
22         FileOutputStream fos = new FileOutputStream("F:\\feng.txt");
23         
24         byte[] buf = new byte[1024];
25         int len = 0;
26         while((len=sis.read(buf))!=-1){
27             fos.write(buf,0,len);
28         }
29         
30         sis.close();
31         fos.close();
32     }
33 
34 }

 

 1 import java.io.FileInputStream;
 2 import java.io.FileOutputStream;
 3 import java.io.IOException;
 4 import java.io.SequenceInputStream;
 5 import java.util.ArrayList;
 6 import java.util.Collections;
 7 import java.util.Enumeration;
 8 import java.util.Iterator;
 9 
10 public class SequenceInputStreamDemo {
11     public static void main(String[] args) throws IOException {
12         ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();
13         al.add(new FileInputStream("F:\\0.txt"));
14         al.add(new FileInputStream("F:\\a.txt"));
15         al.add(new FileInputStream("F:\\info.txt"));
16         
17         Enumeration<FileInputStream> en = Collections.enumeration(al);//该方法的原理就是下面自定义的枚举
18         /*
19         
20         final Iterator<FileInputStream> it = al.iterator();
21         //自定义枚举，与ArrayList的迭代器结合使用
22         Enumeration<FileInputStream> en = new Enumeration<FileInputStream>() {
23             @Override
24             public boolean hasMoreElements() {
25                 return it.hasNext();
26             }
27             @Override
28             public FileInputStream nextElement() {
29                 return it.next();
30             }
31         };
32         */
33         
34         SequenceInputStream sis = new SequenceInputStream(en);
35         
36         FileOutputStream fos = new FileOutputStream("F:\\jian.txt");
37         
38         byte[] buf = new byte[1024];
39         int len = 0;
40         while((len=sis.read(buf))!=-1){
41             fos.write(buf,0,len);
42         }
43         
44         sis.close();
45         fos.close();
46             
47     }
48 
49 }

 

posted @ 2014-03-12 14:36  胡椒粉hjf  阅读(260)  评论(0)  编辑  收藏  举报