📅 最后修改于: 2020-09-27 02:31:22 🧑 作者: Mango
ByteArrayInputStream由两个词组成：ByteArray和InputStream。顾名思义，它可用于读取字节数组作为输入流。
Java ByteArrayInputStream类包含一个内部缓冲区，该缓冲区用于读取字节数组作为流。在此流中，从字节数组中读取数据。
ByteArrayInputStream的缓冲区根据数据自动增长。
让我们看一下Java.io.ByteArrayInputStream类的声明：
public class ByteArrayInputStream extends InputStream
| Constructor | Description |
|---|---|
| ByteArrayInputStream(byte[] ary) | Creates a new byte array input stream which uses ary as its buffer array. |
| ByteArrayInputStream(byte[] ary, int offset, int len) | Creates a new byte array input stream which uses ary as its buffer array that can read up to specified len bytes of data from an array. |
| Methods | Description |
|---|---|
| int available() | It is used to return the number of remaining bytes that can be read from the input stream. |
| int read() | It is used to read the next byte of data from the input stream. |
| int read(byte[] ary, int off, int len) | It is used to read up to len bytes of data from an array of bytes in the input stream. |
| boolean markSupported() | It is used to test the input stream for mark and reset method. |
| long skip(long x) | It is used to skip the x bytes of input from the input stream. |
| void mark(int readAheadLimit) | It is used to set the current marked position in the stream. |
| void reset() | It is used to reset the buffer of a byte array. |
| void close() | It is used for closing a ByteArrayInputStream. |
让我们看一下java ByteArrayInputStream类的简单示例，以读取字节数组作为输入流。
package com.javatpoint;
import java.io.*;
public class ReadExample {
public static void main(String[] args) throws IOException {
byte[] buf = { 35, 36, 37, 38 };
// Create the new byte array input stream
ByteArrayInputStream byt = new ByteArrayInputStream(buf);
int k = 0;
while ((k = byt.read()) != -1) {
//Conversion of a byte into character
char ch = (char) k;
System.out.println("ASCII value of Character is:" + k + "; Special character is: " + ch);
}
}
}
输出：
ASCII value of Character is:35; Special character is: #
ASCII value of Character is:36; Special character is: $
ASCII value of Character is:37; Special character is: %
ASCII value of Character is:38; Special character is: &