How To Convert Byte Array To Inputstream Together With Outputstream Inward Java

Are y'all stuck alongside your coding because y'all conduct hold a byte array in addition to adjacent method inwards chain needs an InputStream? don't worry Java has solution for that, You tin utilisation ByteArrayInputStream to convert byte array to InputStream inwards Java. This cast takes a byte array equally beginning in addition to since it's a sub-class of InputStream, y'all tin easily operate past times this to whatever method, which accepts InputStream equally parameter. Though most of the API similar JDBC in addition to File API allows y'all to read straight from InputStream, because this allows y'all to procedure an arbitrary content alongside limited heap space. You should convey payoff of this in addition to straight read from InputStream instead of getting byte array in addition to therefore converting them dorsum to InputStream.

It's solely for those situation, where y'all conduct hold a legacy code, which is no to a greater extent than maintained in addition to updated. Similarly converting byte array to OutputStream is trivial.

Since nosotros utilisation OutputStream to write something, it allows y'all to straight write byte array inwards it. Say y'all conduct hold got some messages from TCP socket in addition to desire to persist inwards file system, y'all tin utilisation OutputStream in addition to FileOutputStream to write byte array directly.

Earlier nosotros had seen how to convert InputStream to byte array, In this article, nosotros volition run across contrary of that past times creating a uncomplicated event of converting byte array to InputStream inwards action.

Byte Array to InputStream in addition to OutputStream

Here is our sample program, which commencement convey a byte array from String for testing purpose. Anyway, ever render character encoding when converting String to bytes in addition to vice-versa. To recreate scenario, I conduct hold created a static method, which converts an InputStream to String.

This method is called streamToString(), which takes an InputStream in addition to grapheme encoding for reading text. We recreate the same String, which nosotros had previously converted into byte array. Next business office of this event shows, how tin y'all write a byte array to an OutputStream.

By the way, if y'all are non using try-with-resource statement, therefore don't forget to unopen Streams in 1 lawsuit y'all are through alongside it. It tin travel argued that, whether a method, which accepts an InputStream should unopen it or not, exactly I conduct hold closed it to travel on rubber side.

Let me know what is your idea on this, because in that place is event of IO utility classes inwards both Apache Commons IO in addition to Google Guava which closes current in addition to which doesn't unopen the current passed to them.

import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.nio.charset.Charset; import java.nio.charset.StandardCharsets; /**  * Java Program to convert byte array to InputStream in addition to OutputStream inwards Java.  * Uses ByteArrayInputStream in addition to ByteArrayOutputStream examples.  * @author Javin Paul  */ public class ByteArrayToStream {     public static void main(String args[]) {         String str = "Google is GOD";         byte[] bytes = str.getBytes(StandardCharsets.UTF_8);        

        // Creating InputStream from byte array         // ByteArrayInputStream is sub-class of InputStream         InputStream is = new ByteArrayInputStream(bytes);         String stringFromBytes = streamToString(is, StandardCharsets.UTF_8);         System.out.println("String recreated from bytes : " + str);        

        // Writing byte array to OutputStream         OutputStream bone = new ByteArrayOutputStream();         try {             os.write(bytes);             os.close();         } catch (IOException e) {             e.printStackTrace();         }     }     /*      * Read String from InputStream in addition to closes it      */     public static String streamToString(InputStream is, Charset encoding) {         BufferedReader br = new BufferedReader(new InputStreamReader(is, encoding));         StringBuilder sb = new StringBuilder(1024);         try {             String business = br.readLine();             while (line != null) {                 sb.append(line);                 business = br.readLine();             }         } catch (IOException io) {             System.out.println("Failed to read from Stream");             io.printStackTrace();         } finally {             try {                 br.close();             } catch (IOException ioex) {                 System.out.println("Failed to unopen Streams");                 ioex.printStackTrace();             }         }         return sb.toString();     } } Output: String recreated from bytes : Google is GOD

You tin run across how our streamToString() method has converted InputStream to String, exactly existent affair is earlier that, nosotros conduct hold used ByteArrayInputStream to convert our byte array to InputStream inwards Java. As I said ByteArrayInputStream is subclass of InputStream, y'all tin operate past times or utilisation it whenever a InputStream is required. This is besides clear from cast hierarchy diagram taken from java.io package, which shows unlike implementation of InputStream from JDK library.

That's all virtually how to convert byte array to InputStream inwards Java. It mightiness audio hard initially, because of express noesis of java.io package, exactly it’s cash inwards one's chips really uncomplicated in 1 lawsuit y'all know in that place is a cast called ByteArrayInputStream. Since it’s a tike cast of InputStream, y'all tin operate past times it roughly inwards house of InputStream. Don't forget to render grapheme encoding if y'all are converting bytes to characters in addition to unopen streams in 1 lawsuit y'all are done alongside them.


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