Java DataInputStream readUnsignedByte()方法

java.io.DataInputStream.readUnsignedByte() 用于读取一个输入字节，将其零扩展以键入int类型，然后返回结果，因此其范围为0到255。

1 语法

public final int readUnsignedByte()

2 参数

无

3 返回值

此方法返回无符号的8位值。

4 示例

package com.yiidian;

/**

* 一点教程网： http://www.yiidian.com

*/

/**

* java.io.DataInputStream.readUnsignedByte()方法的例子

*/

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

public class Demo {

public static void main(String[] args) throws IOException {

InputStream is = null;

DataInputStream dis = null;

FileOutputStream fos = null;

DataOutputStream dos = null;

byte[] b = {-124,126};

try {

// create file output stream

fos = new FileOutputStream("d:\\test.txt");

// create data output stream

dos = new DataOutputStream(fos);

// for each byte in byte buffer

for(byte j:b) {

// write byte to data output stream

dos.writeByte(j);

}

// force data to the underlying file output stream

dos.flush();

// create file input stream

is = new FileInputStream("d:\\test.txt");

// create new data input stream

dis = new DataInputStream(is);

// available stream to be read

while(dis.available()>0) {

// returns unsigned 8-bit number

int k = dis.readUnsignedByte();

// print

System.out.print(k+" ");

}

} catch(Exception e) {

// if any error occurs

e.printStackTrace();

} finally {

// releases all system resources from the streams

if(is!=null)

is.close();

if(dis!=null)

dis.close();

if(fos!=null)

fos.close();

if(dos!=null)

dos.close();

}

}

}

输出结果为：

132 126