SequenceInputStream

将1.txt，2.txt，3.txt文件中的数据合并到一个文件中

实例1

 1 public static void demo_2() throws IOException {
 2         // TODO Auto-generated method stub
 3         ArrayList<FileInputStream> al=new ArrayList<FileInputStream>();
 4         for(int x=0;x<=3;x++){
 5             al.add(new FileInputStream(x+".txt"));
 6         }
 7         Enumeration<FileInputStream> en=Collections.enumeration(al);
 8 SequenceInputStream sis=new SequenceInputStream(en);
 9 //        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("4.txt"));
10         FileOutputStream fos=new FileOutputStream("4.txt");
11         byte[] buf=new byte[1024];
12         int len=0;
13         while((len=sis.read(buf))!=-1){
14             fos.write(buf, 0, len);
15         }
16         
17         fos.close();
18         sis.close();

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实例2

ArrayList<FileInputStream> al=new ArrayList<FileInputStream>();
        for(int x=0;x<=3;x++){
            al.add(new FileInputStream(x+".txt"));
        }
        final Iterator<FileInputStream> it=al.iterator();
        Enumeration<FileInputStream> en=new Enumeration<FileInputStream>(){

            @Override
            public boolean hasMoreElements() {
                // TODO Auto-generated method stub
                return it.hasNext();
            }

            @Override
            public FileInputStream nextElement() {
                // TODO Auto-generated method stub
                return it.next();
            }    
        };

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实例3

 1 Vector<FileInputStream> v=new Vector<FileInputStream>();
 2         v.add(new FileInputStream("1.txt"));
 3         v.add(new FileInputStream("2.txt"));
 4         v.add(new FileInputStream("3.txt"));
 5         Enumeration<FileInputStream> en=v.elements();
 6         SequenceInputStream sis=new SequenceInputStream(en);
 7 //        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("4.txt"));
 8         FileOutputStream fos=new FileOutputStream("4.txt");
 9         byte[] buf=new byte[1024];
10         int len=0;
11         while((len=sis.read(buf))!=-1){
12             fos.write(buf, 0, len);
13         }
14         
15         fos.close();
16         sis.close();

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posted on 2013-12-08 23:06 ざ柒阅读(136) 评论(0) 编辑收藏举报