因为buffered多了一个缓冲区，读和写都是先把硬盘或者内存中的数据放到内存中一块缓存区域，到一定大小读写到硬盘或者内存
package io;
import java.io.*;
public class FileIOTest {
/**
* @param args
* @throws FileNotFoundException
*/
public static void main(String[] args) throws Exception {
//有buff的File***Stream
System.out.println("有buff的File***Stream耗时：");
new TimeTest() {
void run()throws Exception{
FileInputStream fis = new FileInputStream("F:\\Test\\file.zip");
FileOutputStream fos = new FileOutputStream("F:\\Test\\file1.zip");
byte[] buf = new byte[1024];
int length = 0;
while ((length = fis.read(buf)) > 0) {
fos.write(buf, 0, length);
}
fis.close();
fos.close();
}
}.getTime();
//有buff的Buffered***Stream
System.out.println("有buff的Buffered***Stream耗时：");
new TimeTest() {
void run()throws Exception{
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("F:\\Test\\file.zip"));
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream("F:\\Test\\file2.zip"));
byte[] buf = new byte[1024];
int length = 0;
while ((length = bis.read(buf)) > 0) {
bos.write(buf, 0, length);
}
bis.close();
bos.close();
}
}.getTime();
//无buff的File***Stream
System.out.println("无buff的File***Stream耗时：");
new TimeTest() {
void run()throws Exception{
FileInputStream fis = new FileInputStream("F:\\Test\\file.zip");
FileOutputStream fos = new FileOutputStream("F:\\Test\\file3.zip");
int data = 0;
while ((data = fis.read()) !=-1) {
fos.write(data);
}
fis.close();
fos.close();
}
}.getTime();
//无buff的Buffered***Stream
System.out.println("无buff的Buffered***Stream耗时：");
new TimeTest() {
void run()throws Exception{
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("F:\\Test\\file.zip"));
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream("F:\\Test\\file4.zip"));
int data = 0;
int i =bis.available();
while ((data = bis.read()) !=-1) {
bos.write((byte)data);
}
bis.close();
bos.close();
}
}.getTime();
}
}
//抽象的不太好的模板设计模式
abstract class TimeTest {
void getTime() {
long start = System.currentTimeMillis();
try {
run();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(System.currentTimeMillis() - start);
}
abstract void run() throws Exception;
}
测试数据248kb
测试结果：
有buff的File***Stream耗时：
8
有buff的Buffered***Stream耗时：
2
无buff的File***Stream耗时：
1369
无buff的Buffered***Stream耗时：
14
