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Java ByteArrayInputStream class

Byte array input stream in memory to create a buffer byte array input stream to read data from an array of bytes stored in the buffer. Create a byte array input stream objects There are several ways.

Receive byte array as a parameter to create: 

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

Another way to create is to receive a byte array, and two integer variable off, len, off represents the first byte read, len indicates the length of bytes read. 

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

After the byte array input stream object is successfully created, you can see the following list of methods, convection read operation or other operations.

No. Method Description
1 public int read ()
This input stream to read the next data byte.
2 public int read (byte [] r , int off, int len)
The most len bytes of data from this input stream into an array of bytes.
3 public int available ()
Returns may not be blocking this input the number of bytes read from the stream.
4 public void mark (int read)
Set the stream at the current marker position.
5 public long skip (long n)
From this input stream to skip n bytes of input.

Examples

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 above examples compiled results are 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