Java/File Input Output/ByteArrayInputStream

ByteArrayInputStream Reset

   

import java.io.ByteArrayInputStream;
import java.io.IOException;
class MainClass {
  public static void main(String args[]) throws IOException {
    String tmp = "abc";
    byte b[] = tmp.getBytes();
    ByteArrayInputStream in = new ByteArrayInputStream(b);
    for (int i = 0; i < 2; i++) {
      int c;
      while ((c = in.read()) != -1) {
        if (i == 0) {
          System.out.print((char) c);
        } else {
          System.out.print(Character.toUpperCase((char) c));
        }
      }
      System.out.println();
      in.reset();
    }
  }
}

Byte Array IO

   
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
public class ByteArrayIOApp {
  public static void main(String args[]) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
      outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.size());
    ByteArrayInputStream inStream;
    inStream = new ByteArrayInputStream(outStream.toByteArray());
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
  }
}

Convert string into InputStream using ByteArrayInputStream class.

  
 
import java.io.ByteArrayInputStream;
import java.io.InputStream;
public class Main {
  public static void main(String[] args)throws Exception {
    String text = "Converting String to InputStream Example";
    InputStream is = new ByteArrayInputStream(text.getBytes("UTF-8"));
  }
}

Demonstrate ByteArrayInputStream

   

import java.io.ByteArrayInputStream;
import java.io.IOException;
class ByteArrayInputStreamDemo {
  public static void main(String args[]) throws IOException {
    String tmp = "abcdefghijklmnopqrstuvwxyz";
    byte b[] = tmp.getBytes();
    ByteArrayInputStream input1 = new ByteArrayInputStream(b);
    ByteArrayInputStream input2 = new ByteArrayInputStream(b, 0, 3);
  }
}

Read ByteArrayInputStream to String

 
import java.io.ByteArrayInputStream;
/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */
/*
 * @(#)ASCIIUtility.java  1.10 05/08/29
 *
 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
 */
public class Utils {
  public static String toString(ByteArrayInputStream is) {
    int size = is.available();
    char[] theChars = new char[size];
    byte[] bytes    = new byte[size];
    is.read(bytes, 0, size);
    for (int i = 0; i < size;)
        theChars[i] = (char)(bytes[i++]&0xff);
    
    return new String(theChars);
      }
}