IO流的字节流的缓冲和非缓冲方式的区别及性能对比

 package com.led.io;
  import java.io.BufferedInputStream;
  import java.io.BufferedOutputStream;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.InputStream;
  import java.io.OutputStream;
 public class Buffer_Pro {
     /*
      * 非缓冲复制文件 
      */
     public static void steam()throws Exception{
         InputStream  inputStream=new FileInputStream("E://党//111.docx");
         OutputStream outputStream=new FileOutputStream("E://复制的.docx");
         int b=0;
         long startTime=System.currentTimeMillis();
         while((b=inputStream.read())!=-1){//读取到最后一个字节返回-1
             outputStream.write(b);
         }
         inputStream.close();//关闭输入流
         outputStream.close();//关闭输出流
        long endTime=System.currentTimeMillis();
         System.out.println("非缓冲复制花费的时间是："+(endTime-startTime)+"ms");
     }
     /*
      * 带缓冲的复制文件
      */
     public static void bufferstream() throws Exception{
         BufferedInputStream bufferedInputStream=new BufferedInputStream(new FileInputStream("E://党//111.docx"));
         BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream("E://复制的2.docx"));
         int b=0;
         long startTime=System.currentTimeMillis();//开始时间
         while((b=bufferedInputStream.read())!=-1){//读取到最后一个字节返回-1
             bufferedOutputStream.write(b);
         }
         bufferedInputStream.close();//关闭输入流
        bufferedOutputStream.close();//关闭输出流
        long endTime=System.currentTimeMillis();//结束时间
         System.out.println("缓冲复制花费的时间是："+(endTime-startTime)+"ms");
     }
     public static void main(String[] args) throws Exception {
         steam();
         bufferstream();
     }
 }