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How to convert an input stream to byte array in java?
The InputStream class in Java provides read() method. This method accepts a byte array and it reads the contents of the input stream to the given byte array.
Example
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
public class StreamToByteArray {
public static void main(String args[]) throws IOException{
InputStream is = new BufferedInputStream(System.in);
byte [] byteArray = new byte[1024];
System.out.println("Enter some data");
is.read(byteArray);
String s = new String(byteArray);
System.out.println("Contents of the byte stream are :: "+ s);
}
}Output
Enter some data hello how are you Contents of the byte stream are :: hello how are you
Alternative Solution
Apache commons provides a library named org.apache.commons.io and, following is the maven dependency to add library to your project.
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency>
This package provides a class known as IOUtils. the toByteArray () method of this class accepts an InputStream object and returns the contents in the stream in the form of a byte array:
Example
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.commons.io.IOUtils;
public class StreamToByteArray2IOUtils {
public static void main(String args[]) throws IOException{
File file = new File("data");
FileInputStream fis = new FileInputStream(file);
byte [] byteArray = IOUtils.toByteArray(fis);
String s = new String(byteArray);
System.out.println("Contents of the byte stream are :: "+ s);
}
}
Output
Contents of the byte stream are :: hello how are you
Updated on: 06-Mar-2020
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