分割流

package other;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;

public class SplitFile {

    public static void main(String[] args) throws IOException {
        merge();
    }

    public static void splitFile() throws IOException {

        FileInputStream fis = new FileInputStream("test.mp3");
        FileOutputStream fos = null;
        byte[] buf = new byte[1024 * 1024];

        int len = 0;
        int count = 1;
        while ((len = fis.read(buf)) != -1) {
            fos = new FileOutputStream("splitFiles\\" + (count++) + ".part");
            fos.write(buf, 0, len);
            fos.close(); // 及时关掉流
        }

        fis.close();
    }

    public static void merge() throws IOException {
        ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();
        for (int i = 1; i <= 4; i++) {
            al.add(new FileInputStream("splitFiles\\" + i + ".part"));
        }

        Iterator<FileInputStream> it = al.iterator();
        Enumeration<FileInputStream> en = new Enumeration<FileInputStream>() {

            @Override
            public boolean hasMoreElements() {
                return it.hasNext();
            }

            @Override
            public FileInputStream nextElement() {
                return it.next();
            }
        };
        SequenceInputStream sis = new SequenceInputStream(en);

        FileOutputStream fos = new FileOutputStream("merge.mp3");
        byte[] buf = new byte[1024];
        int len = 0;
        while ((len = sis.read(buf)) != -1) {
            fos.write(buf, 0, len);
        }

        fos.close();
        sis.close();
    }

}