Java ByteArrayInputStream Class

Java Stream

The byte array input stream creates a byte array buffer in memory, and the data read from the input stream is stored in this byte array buffer. There are several ways to create a byte array input stream object.

Create by accepting a byte array as a parameter:

ByteArrayInputStream bArray = new ByteArrayInputStream(byte [] a);

Another way to create it is to accept a byte array and two integer variables, off and len, where off represents the first byte to be read and len represents the length of bytes to be read.

ByteArrayInputStream bArray = new ByteArrayInputStream(byte []a, 
                                                       int off, 
                                                       int len)

After successfully creating a byte array input stream object, you can refer to the methods in the following list to perform read operations or other operations on the stream.

Example

The following example demonstrates the use of ByteArrayInputStream and ByteArrayOutputStream:

import java.io.*;

public class ByteStreamTest {

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

      ByteArrayOutputStream bOutput = new ByteArrayOutputStream(12);

      while( bOutput.size()!= 10 ) {
         // 获取用户输入值
         bOutput.write(System.in.read());
      }

      byte b [] = bOutput.toByteArray();
      System.out.println("Print the content");
      for(int x= 0 ; x < b.length; x++) {
         // 打印字符
         System.out.print((char)b[x]  + "   ");
      }
      System.out.println("   ");

      int c;

      ByteArrayInputStream bInput = new ByteArrayInputStream(b);

      System.out.println("Converting characters to Upper case " );
      for(int y = 0 ; y < 1; y++ ) {
         while(( c= bInput.read())!= -1) {
            System.out.println(Character.toUpperCase((char)c));
         }
         bInput.reset();
      }
   }
}

The output of the above example is as follows:

asdfghjkly
Print the content
a   s   d   f   g   h   j   k   l   y
Converting characters to Upper case
A
S
D
F
G
H
J
K
L
Y

Java Stream