合并流SequenceInputStream

//将多个文件合并成一个文件
    public static void merge(String newPath,String[] files) throws IOException {
        Vector<FileInputStream> v = new Vector<>();
        for (String file:files) {
            v.add(new FileInputStream(file));
        }
        Enumeration<FileInputStream> elements = v.elements();
        SequenceInputStream sis = new SequenceInputStream(elements);

        FileOutputStream fos = new FileOutputStream(newPath);
        byte[] bytes = new byte[1024];
        int len=0;
        while((len = sis.read(bytes))!=-1){
            fos.write(bytes,0,len);
        }
        fos.close();
        sis.close();
    }