import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class FileDemo2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		File file1 = new File("one.txt");
		File file2 = new File("two.txt");
		try {
			if (!file1.exists()) {
				file1.createNewFile();
			}
			if (!file2.exists()) {
				file2.createNewFile();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		final int N = 100000;
		byte[] chs = new byte[N];
		for (int i = 0; i < N; ++i) {
			chs[i] = (byte) (Math.random() * 128);
		}
		try {
			FileOutputStream fos = new FileOutputStream(file1);
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file2));
			long before;
			before = System.currentTimeMillis();
			for(byte ch: chs) {
				fos.write(ch);
			}
			fos.close();
			before = System.currentTimeMillis() - before;
			System.out.println("one.txt不使用缓冲流来写\n用时为：" + before);
			long next;
			next = System.currentTimeMillis();
			for(byte ch: chs) {
				bos.write(ch);
			}
			bos.flush();
			bos.close();
			next = System.currentTimeMillis() - next;
			System.out.println("two.txt使用缓冲流来写\n用时为：" + next);
			System.out.println("节省时间：" + (before - next) + "ms");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

}