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