Convert a String to an Input Stream in Java

This post will discuss how to convert the specified string to an input stream in Java, encoded as bytes using the specified character encoding.

1. Using `ByteArrayInputStream`

The idea is to get a sequence of bytes from the given specified and create a ByteArrayInputStream from it, as shown below. This works as ByteArrayInputStream class extends the InputStream class. We have used StandardCharsets.UTF_8 to specify the charset. Before Java 7, we can use the Charset.forName("UTF-8").

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.nio.charset.StandardCharsets;

// Program to convert a string to `InputStream` in Java

class Main

{

public static void main(String[] args)

{

String input = "Techie Delight";

try {

// get a sequence of bytes from the given string

byte[] bytes = input.getBytes(StandardCharsets.UTF_8);

// Creates a `ByteArrayInputStream` from the input buffer

InputStream in = new ByteArrayInputStream(bytes);

// do something

// close the input stream

in.close();

}

catch (IOException e) {

e.printStackTrace();

}

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2. Using Apache Commons IO

Apache Commons IO IOUtils class provides several IO stream manipulation utility static methods. One such method is toInputStream(), which converts the specified string to an input stream using the specified character encoding.

import org.apache.commons.io.IOUtils;