SequenceInputStream的用法

package cn.hncu.IoDemo;


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


/**
 * @author 隽
 * 
 */
public class SplitFile {
/*需求:1、将一个内存很大的文件拆分成多个小文件。
*  2、再将这些小文件重新拼成原先的大文件。
*/
public static void main(String[] args) throws IOException {
ArrayList list = new ArrayList();
BufferedInputStream in = new BufferedInputStream(new FileInputStream(
"a.txt"));
byte buf[] = new byte[1024 * 1024];
int len = 0;
int j = 0;
while ((len = in.read(buf)) != -1) {
String a = ++j + "";
FileOutputStream out = new FileOutputStream(a + ".txt");
out.write(buf, 0, len);
FileInputStream in1 = new FileInputStream(a + ".txt");
list.add(in1);
}
in.close();


Enumeration en = Collections.enumeration(list);
SequenceInputStream sis = new SequenceInputStream(en);


FileOutputStream fos = new FileOutputStream("a1.txt");
byte[] buf1 = new byte[512];
int len1 = 0;
while ((len1 = sis.read(buf1)) != -1) {
fos.write(buf1, 0, len1);
}
fos.close();
sis.close();
}
}