94、java的IO操作-合并流

一、SequenceInputStream概述SequenceInputStream类可以将多个输入流串流在一起，合并为一个输入流，因此，该流也被称为合并流。二、SequenceInputStream的构造方法SequenceInputStream(InputStream s1, InputStream s2)  SequenceInputStream(Enumeration<? extends InputStream> e)把多个文件的内容写入到一个文本文件/* * 以前的操作： * a.txt -- b.txt * c.txt -- d.txt *  * 现在想要： * a.txt+b.txt -- c.txt */public class SequenceInputStreamDemo {public static void main(String[] args) throws IOException {// SequenceInputStream(InputStream s1, InputStream s2)// 需求：把ByteArrayStreamDemo.java和DataStreamDemo.java的内容复制到Copy.java中InputStream s1 = new FileInputStream("ByteArrayStreamDemo.java");InputStream s2 = new FileInputStream("DataStreamDemo.java");SequenceInputStream sis = new SequenceInputStream(s1, s2);BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("Copy.java"));// 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];int len = 0;while ((len = sis.read(bys)) != -1) {bos.write(bys, 0, len);}bos.close();sis.close();}}/* * 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 {public static 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>();InputStream s1 = new FileInputStream("ByteArrayStreamDemo.java");InputStream s2 = new FileInputStream("CopyFileDemo.java");InputStream s3 = new FileInputStream("DataStreamDemo.java");v.add(s1);v.add(s2);v.add(s3);Enumeration<InputStream> en = v.elements();SequenceInputStream sis = new SequenceInputStream(en);BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("Copy.java"));// 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];int len = 0;while ((len = sis.read(bys)) != -1) {bos.write(bys, 0, len);}bos.close();sis.close();}}