We can convert Java String to Input with below approaches:

Example1:

String str = "Hello World!";
InputStream inputStream = new ByteArrayInputStream(str.getBytes());

Example 2 with UTF8:

javaCopy codeString str = "Hello World!";
InputStream inputStream = new ByteArrayInputStream(str.getBytes("UTF-8"));

Alternatively you can see the below link to convert InputStream back to String

Thanks for Reading..