文件复制测试流的性能

package com.test.test02;

import java.io.*;

//文件拷贝,高效字节流测试(文件大小:5.24M)
public class Test01 {
public static void main(String[] args) {
copy01();
// copy02();
}

private static void copy02() {
    //基本流拷贝,一个字节一个字节拷贝
    long startTime = System.currentTimeMillis();
    System.out.println("基本流开始复制了");
    try (
            FileInputStream fis = new FileInputStream("E:/copyTest/八卦.pdf");
            FileOutputStream fos = new FileOutputStream("E:/targetPath/八卦test.pdf")
    ) {
        //读
        int len;
        while ((len = fis.read()) != -1) {
            //写
            fos.write(len);
        }

        //数组
        /*byte[] bytes = new byte[1024];
        int len;
        while ((len=fis.read(bytes))!=-1){
            fos.write(bytes);
        }*/


    } catch (IOException e) {
        e.printStackTrace();
    }

    long endTime = System.currentTimeMillis();
    System.out.println("基本流结束复制了");
    System.out.println("基本流耗时:" + (endTime - startTime));
    /*
    数组:438
    一个一个字节复制:60152
     */
}

private static void copy01() {
    //高效流复制文件
    long startTime = System.currentTimeMillis();
    System.out.println("增强流开始复制了");
    try (
            BufferedInputStream bis =
                    new BufferedInputStream(new FileInputStream("E:/copyTest/八卦.pdf"));
            BufferedOutputStream bos =
                    new BufferedOutputStream(new FileOutputStream("E:/targetPath/八卦test.pdf"))
    ) {
        /*byte[] bytes=new byte[1024];
        int len;
        while ((len=bis.read(bytes))!=-1){
            bos.write(bytes);
        }*/
        int len;
        while ((len=bis.read())!=-1){
            bos.write(len);
        }

    } catch (IOException e) {
        e.printStackTrace();
    }

    long endTime = System.currentTimeMillis();
    System.out.println("增强流结束复制了");
    System.out.println("增强流耗时:" + (endTime - startTime));
    /*
    数组:30
    一个一个字节复制:369
     */
}

}