How do I convert a String to an InputStream in Java?

Given a string:

String exampleString = "example"; 

How do I convert it to an InputStream?

5 Answers

Like this:

InputStream stream = new ByteArrayInputStream(exampleString.getBytes(StandardCharsets.UTF_8)); 

Note that this assumes that you want an InputStream that is a stream of bytes that represent your original string encoded as UTF-8.

For versions of Java less than 7, replace StandardCharsets.UTF_8 with "UTF-8".

I find that using Apache Commons IO makes my life much easier.

String source = "This is the source of my input stream"; InputStream in = org.apache.commons.io.IOUtils.toInputStream(source, "UTF-8"); 

You may find that the library also offer many other shortcuts to commonly done tasks that you may be able to use in your project.

You could use a StringReader and convert the reader to an input stream using the solution in this other stackoverflow post.

There are two ways we can convert String to InputStream in Java,

1. Using ByteArrayInputStream

Example :-

String str = "String contents"; InputStream is = new ByteArrayInputStream(str.getBytes(StandardCharsets.UTF_8)); 

2. Using Apache Commons IO

Example:-

String str = "String contents" InputStream is = IOUtils.toInputStream(str, StandardCharsets.UTF_8); 

You can try cactoos for that.

final InputStream input = new InputStreamOf("example"); 

The object is created with new and not a static method for a reason.