合并流

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package other;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.SequenceInputStream;import java.util.Enumeration;import java.util.Vector;public class SequenceDemo {    public static void main(String[] args) throws IOException {        Vector<FileInputStream> v = new Vector<FileInputStream>();        v.add(new FileInputStream("1.txt"));        v.add(new FileInputStream("2.txt"));        v.add(new FileInputStream("3.txt"));        Enumeration<FileInputStream> en = v.elements();        // 接受两个参数时可以直接在参数列表里写；接受多个参数时，只能接受Enumeration对象        SequenceInputStream sis = new SequenceInputStream(en);        FileOutputStream fos = new FileOutputStream("4.txt");        byte[] buf = new byte[1024];        int len = 0;        while ((len = sis.read(buf)) != -1) {            fos.write(buf, 0, len);        }        fos.close();        sis.close();    }}

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