import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

public class BufferdeDemo1 {

public static void main(String[] args) {

// 将100000个字符分别写入文件one.txt和two.txt ,two用缓冲文件输入输出流写。对比用时的多少

// 创建one.txt文件

File f1 = new File("one.txt");

if (!f1.exists()) {

try {

f1.createNewFile();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 创建two.txt文件

File f2 = new File("two.txt");

if (!f2.exists()) {

try {

f2.createNewFile();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 不用缓冲流将100000个字符写入one.txt

try {

FileOutputStream fos = new FileOutputStream("one.txt");

long l1Start = System.currentTimeMillis();

for (int i = 0; i < 100000; i++) {

fos.write(i);

}

long l1End = System.currentTimeMillis();

System.out.println(f1.getName() + "不适用缓冲流来写用时为：" + (l1End - l1Start));

fos.close();

// 使用缓冲流

FileOutputStream fos1 = new FileOutputStream("two.txt");

BufferedOutputStream bos1 = new BufferedOutputStream(fos1);

FileInputStream fis1=new FileInputStream("two.txt");

BufferedInputStream bis1=new BufferedInputStream(fis1);

long l2Start = System.currentTimeMillis();

for (int i = 0; i < 100000; i++) {

bos1.write(i);

}

long l2End = System.currentTimeMillis();

System.out.println(f2.getName() + "使用缓冲流来写用时为：" + (l2End - l2Start) + "\n节省时间："

+ ((l2End - l2Start) - (l1End - l1Start)) + "ms");

fos1.close();

//bos1.flush();

bos1.close();

fis1.close();

bis1.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}