java多文件复制

java多文件复制

package file;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.SequenceInputStream;import java.util.Enumeration;import java.util.Iterator;import java.util.LinkedHashSet;import java.util.Set;//多文件复制public class Demo10 {public static void main(String[] args) throws IOException {// TODO Auto-generated method stub textsequenceinputstream();}private static void textsequenceinputstream() throws IOException {// TODO Auto-generated method stubInputStream fis1 = new FileInputStream("D://a.txt");InputStream fis2 = new FileInputStream("D://b.txt");InputStream fis3 = new FileInputStream("D://c.txt");    Set<InputStream> set =new LinkedHashSet<InputStream>();    set.add(fis1);    set.add(fis2);    set.add(fis3);        final Iterator<InputStream> it =  set.iterator();    SequenceInputStream sis = new SequenceInputStream(    new Enumeration<InputStream>(){@Overridepublic boolean hasMoreElements() {// TODO Auto-generated method stubreturn it.hasNext();}@Overridepublic InputStream nextElement() {// TODO Auto-generated method stubreturn it.next();}            }             );        OutputStream fos = new FileOutputStream("D://sis.txt");    int len = 0;    byte[] buf = new byte[1024];    while((len = sis.read(buf))!= -1){    fos.write(buf,0,len);        }        fos.close();    sis.close();}}