FileInputStream:当读取到文件的末尾时，当读到文件末尾时，read()会返回-1,根据这个返回值来判断是否已经读取到文件末尾。
当没有读到文件末尾时，read()返回的是实际读取的字节数。
package com.filestream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class fileInputstreamDemo {
public static void main(String[] args) {
int fileLen = 0;
FileInputStream fis;
try {
fis = new FileInputStream("c:\\filetest\\file\\speech.txt");
/*
* 读取方法1
int temp = 0;
while ((temp = fis.read()) != -1) {
System.out.print((char)temp);
fileLen++;
}
fis.close();
*/
//读取方法2：
byte []temp = new byte[26];
fis.read(temp);
System.out.println(new String(temp));
fileLen = temp.length;
fis.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("file lenth : " + fileLen);
}
}
FileOutputStream and BufferedOutputStream:
package com.filestream;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class bufferstreamDemo {
public static void main(String[] args) {
try {
FileOutputStream fos = new FileOutputStream("c:\\filetest\\file\\one.txt");
FileOutputStream fos2 = new FileOutputStream("c:\\filetest\\file\\two.txt");
BufferedOutputStream bos = new BufferedOutputStream(fos2);
long oneStarttime = System.currentTimeMillis();
int temp1 = 0;
while(temp1<100000) {
fos.write('a');
temp1++;
// System.out.println("正在写one.txt: "+ temp1);
}
long oneEndTime = System.currentTimeMillis();
System.out.println("one.txt不使用缓存流来写,用时为： " + (oneEndTime - oneStarttime));
int temp2 = 0;
long oneStarttime2 = System.currentTimeMillis();
while(temp2<100000) {
bos.write('a');
temp2++;
// System.out.println("正在写two.txt: "+ temp2);
// bos.flush();
}
long oneEndTime2 = System.currentTimeMillis();
System.out.println("two.txt使用缓存流来写,用时为： " + (oneEndTime2 - oneStarttime2));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}