BufferedInputStream、BufferedOutputStream 带缓冲的输入输出流--对文件的操作

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Test7 {

	public static void bufferStream() throws Exception {
		BufferedInputStream bufferedInputStream=new BufferedInputStream(new FileInputStream("D://a.docx"));
		BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream("D://a复制.doc"));
				int b=0;
				long start=System.currentTimeMillis();
		while((b=bufferedInputStream.read())!=-1) {
			bufferedOutputStream.write(b);
		}
		bufferedInputStream.close();
		bufferedOutputStream.close();
		long end=System.currentTimeMillis();
		System.out.println("缓冲花费时间："+(end-start)+" ms");
	}
	
	public static void stream() throws Exception {
		FileInputStream fis=new FileInputStream("d://a.docx");
		FileOutputStream fos=new FileOutputStream("D://复制a.docx");
		int b=0;
		long start=System.currentTimeMillis();
		while((b=fis.read())!=-1) {
			fos.write(b);
		}
		fis.close();
		fos.close();
		long end=System.currentTimeMillis();
		System.out.println("非缓冲花费时间："+(end-start)+"ms");
	}
	public static void main(String[] args) throws Exception {
       
		bufferStream();
		stream();
	}

}

运行结果：