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Java ByteArrayOutputStream class

Byte array output stream in memory to create a buffer byte array, all data sent to the output stream is stored in the byte array buffer. Create a byte array output stream objects There are several ways.

The following constructor creates a 32-byte (default size) buffer. 

OutputStream bOut = new ByteArrayOutputStream();

Another constructor creates a buffer of size n bytes. 

OutputStream bOut = new ByteArrayOutputStream(int a)

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

No. Method Description
1 public void reset ()
This byte array output stream count is reset to zero field, thus discarding the output stream all the data currently accumulated output.
2 public byte [] toByteArray ()
Creates a newly allocated byte array. Size of the array and the size of the current output stream, the content is a copy of the current output stream.
3 public String toString ()
The buffer's contents into a string, according to the platform's default character encoding bytes into characters.
4 public void write (int w)
The specified byte to this byte array output stream.
5 public void write (byte [] b , int of, int len)
The specified byte array starting at offset off beginning len bytes written to this byte array output stream.
6 public void writeTo (OutputStream outSt)
All the contents of this byte array output stream to the specified output stream argument.

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
         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;
      ByteArrayOutputStream bInput = new ByteArrayOutputStream(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