How To Convert Inputstream To Byte Array Inwards Coffee - Two Examples

Sometimes nosotros involve to convert InputStream to byte array inward Java, or you lot tin enjoin reading InputStream equally a byte array, In lodge to run yesteryear output to a method which accepts byte array rather than InputStream. One pop event of this, I induce got seen is an older version of Apache common codec, while converting byte array to the hex string. Though, a later on version of the same library exercise supply an overloaded method, to accept InputStream. Java File API provides first-class back upwards to read files similar image, text equally InputStream inward Java program, only equally I said, sometimes you lot involve String or byte array, instead of InputStream . Earlier nosotros induce got seen 5 ways to convert InputStream to String inward Java , we tin purpose unopen to of the techniques from at that spot spell getting the yte array from InputStream inward Java. If you lot similar to purpose Apache common library, which I intend you lot should, at that spot is a utility shape called IOUtils, which tin endure used to easily convert InputStream to byte array inward Java. 

If you lot don't similar using opened upwards root library for such variety of thinks, in addition to similar to write your ain method, you lot tin easily exercise in addition to thence yesteryear using touchstone Java File API. In this Java tutorial nosotros volition meet examples of both ways to convert InputStream to byte array inward Java.

Java programme to convert InputStream to byte array inward Java

one liner and it's tested for diverse variety of input e.g. text file, binary file, images, in addition to both large in addition to pocket-size files. 

By writing your ain method for mutual utilities, which is adept inward feel of ownership; It's hard to larn same variety of testing exposure. That's the argue I prefer to purpose opened upwards root libraries, similar Apache common in addition to Google Guava, along amongst JDK. They effectively complement touchstone Java library, in addition to amongst Maven, it’s pretty slow to handle dependency. By the way, In this example, we are reading a pocket-size text file using FileInputStream inward Java.

import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import org.apache.commons.io.IOUtils;  /**  * Java programme to convert InputStream to byte array inward Java.  * This Java examples uses Apache common IOUtils to   * exercise byte array from InputStream  * in addition to Simply Java method to convert InputStream to byte array.  *  * @author Javin Paul  */ public class InputStreamToByteArray {       public static void main(String args[]) throws FileNotFoundException, IOException {                 //Converting InputStream to byte array using apche common IO library         int length = toByteArrayUsingCommons(                        new FileInputStream("C:/temp/abc.txt")).length;                  System.out.println("Length of byte array created from InputStream inward Java using IOUtils : " + length);                         //Converting InputStream to Byte arrray using Java code         length = toByteArrayUsingJava(                     new FileInputStream("C:/temp/abc.txt")).length;         System.out.println("Length of Byte array created from FileInputStream inward Java           : " + length);             }             /*      * Converts InputStream to ByteArray inward Java using Apache common IOUtils shape      */     public static byte[] toByteArrayUsingCommons(InputStream is)     throws IOException{         return IOUtils.toByteArray(is);     }         /*      * Read bytes from inputStream in addition to writes to OutputStream,      * later on converts OutputStream to byte array inward Java.      */     public static byte[] toByteArrayUsingJava(InputStream is)     throws IOException{         ByteArrayOutputStream baos = new ByteArrayOutputStream();         int reads = is.read();                 while(reads != -1){             baos.write(reads);             reads = is.read();         }                return baos.toByteArray();             } }  Output: Length of byte array created from InputStream inward Java using IOUtils : 27 Length of Byte array created from FileInputStream inward Java           : 27 

That's all on How to convert InputStream to byte array inward Java. You tin this play a joke on to larn byte array from whatever variety of InputStream e.g. ObjectInputStream, FileInputStream or DataInputStream inward Java.


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