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package io;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

/**

* 文件字节输入流

*/

public class FileInputStreamDemo {

public static void main(String[] args) {

read();

}

// 读取数据

public static void read() {

File file = new File("d:" + File.separator + "test.txt");

try {

// 针对文件创建一个字节输入流

InputStream in = new FileInputStream(file);

// 创建一个10KB的字节数组，表示每次最大读取的长度

byte[] bytes = new byte[10 * 1024];

// 每次实际读取的长度

int len = -1;

// 创建一个StringBuffer用于保存每次读取的数据

StringBuffer stringBuffer = new StringBuffer();

// 开始读取数据

while ((len = in.read(bytes)) != -1) {

stringBuffer.append(new String(bytes, 0, len));

}

// 最后记得要关闭字节输入流释放资源

in.close();

// 打印出读取出来的数据

System.out.println(stringBuffer);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}