java之SequenceInputStream

SequenceInputStream可以用来读多个文件，并合并它们。

测试代码：

package ;

import java.io.BufferedOutputStream;
import java.io.Closeable;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;

import junit.framework.TestCase;

public class TestSequenceInputStream extends TestCase {

	public void testSequenceInputStream() {
		SequenceInputStream sequenceInputStream = null;
		Collection<FileInputStream> list = new ArrayList<FileInputStream>();
		FileOutputStream fos = null;
		BufferedOutputStream bos = null;

		for (int i = 0; i < 3; i++) {
			try {
				list.add(new FileInputStream("c:/" + i + ".txt"));
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
		}
		
		Enumeration<FileInputStream> enums = Collections.enumeration(list);
		sequenceInputStream = new SequenceInputStream(enums);
		byte[] bytes = new byte[1024];
		int len = 0;
		try {
			fos = new FileOutputStream("c:/5.txt");
			bos = new BufferedOutputStream(fos);
			while ((len = sequenceInputStream.read(bytes)) != -1) {
				bos.write(bytes, 0, len);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			close(bos);
			close(fos);
			close(sequenceInputStream);
			for (FileInputStream in : list) {
				close(in);
			}
		}
	}

	private void close(Closeable closeable) {
		if (closeable != null) {
			try {
				closeable.close();
				closeable = null;
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}