文件拷贝过程中使用文件流、缓冲流、转换流以及速率比较

package com.oracle.huanchongliu;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import org.junit.Test;

public class Test_huanchong {

/**
* 实用了文件流和缓冲流
*/
@Test
public void test1(){
File file=new File("E:\\冰与火之歌\\[电影天堂www.dy2018.net]冰与火之歌：权力的游戏第一季05集中英双字[1024分辨率].RMVB");
File file1=new File("E:\\复制1.RMVB");

long t1=System.currentTimeMillis();
long t2=0;

FileInputStream fis=null;
FileOutputStream fos=null;
BufferedInputStream bis=null;
BufferedOutputStream bos=null;
try {
fis=new FileInputStream(file);
bis=new BufferedInputStream(fis);
fos=new FileOutputStream(file1);
bos=new BufferedOutputStream(fos);

byte[] by=new byte[1024];
int len=1024;
while((len=bis.read(by))!=-1){
bos.write(by, 0, len);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

t2=System.currentTimeMillis();
System.out.println(t2-t1);

}
/**
* 什么也不使用的，只用了文件流
*/
@Test
public void test2(){
File file=new File("E:\\冰与火之歌\\[电影天堂www.dy2018.net]冰与火之歌：权力的游戏第一季05集中英双字[1024分辨率].RMVB");
File file1=new File("E:\\复制2.RMVB");

long t1=System.currentTimeMillis();
long t2=0;

FileInputStream fis=null;
FileOutputStream fos=null;

try {
fis=new FileInputStream(file);

fos=new FileOutputStream(file1);

byte[] by=new byte[1024];
int len=1024;
while((len=fis.read(by))!=-1){
fos.write(by, 0, len);
fos.flush();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

t2=System.currentTimeMillis();
System.out.println(t2-t1);

}
/**
* 使用了文件流、缓冲流、转换流
*/
@Test
public void test3(){
File file=new File("E:\\冰与火之歌\\[电影天堂www.dy2018.net]冰与火之歌：权力的游戏第一季05集中英双字[1024分辨率].RMVB");
File file1=new File("E:\\复制3.RMVB");

long t1=System.currentTimeMillis();
long t2=0;

FileInputStream fis=null;
InputStreamReader isr=null;
BufferedReader bis=null;

FileOutputStream fos=null;
OutputStreamWriter osw=null;
BufferedWriter bos=null;

try {
fis=new FileInputStream(file);
isr=new InputStreamReader(fis);
bis=new BufferedReader(isr);

fos=new FileOutputStream(file1);
osw=new OutputStreamWriter(fos);
bos=new BufferedWriter(osw);

char[] by=new char[1024];
int len=1024;
while((len=bis.read(by))!=-1){
bos.write(by,0,len);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

t2=System.currentTimeMillis();
System.out.println(t2-t1);

}

}