I'm not used to working with streams in Java - how do I create an InputStream from a String?
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4how are you going to use the InputStream created from String?MohamedSanaulla– MohamedSanaulla2011-04-19 18:02:03 +00:00Commented Apr 19, 2011 at 18:02
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6 Answers
Here you go:
InputStream is = new ByteArrayInputStream( myString.getBytes() );
Update For multi-byte support use (thanks to Aaron Waibel's comment):
InputStream is = new ByteArrayInputStream(Charset.forName("UTF-16").encode(myString).array());
Please see ByteArrayInputStream manual.
It is safe to use a charset argument in String#getBytes(charset) method above.
After JDK 7+ you can use
java.nio.charset.StandardCharsets.UTF_16
instead of hardcoded encoding string:
InputStream is = new ByteArrayInputStream(StandardCharsets.UTF_16.encode(myString).array());
7 Comments
Paŭlo Ebermann
@Aaron: No,
String.getBytes() will use the platform default encoding (which may or may not be the one you want here). For me, this is UTF-8 (which can encode all Java Strings). The right answer would be "indicate the encoding you really want", not "use UTF-16". And you can use it with .getBytes(charsetName), don't have to explicitly create a Charset object and encode the String to a ByteBuffer.
Vitamon
How about not using String.getBytes? It allocates a copy of string, so it is not memory effective solution. The reason to use inputstream is usually to avoid keeping a copy of large object in memory
kevinarpe
This answer could be updated to mention
java.nio.charset.StandardCharsets.UTF_16.
anubhava
Good suggestion @kevinarpe, I have edited.
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You could do this:
InputStream in = new ByteArrayInputStream(string.getBytes("UTF-8"));
Note the UTF-8 encoding. You should specify the character set that you want the bytes encoded into. It's common to choose UTF-8 if you don't specifically need anything else. Otherwise if you select nothing you'll get the default encoding that can vary between systems. From the JavaDoc:
The behavior of this method when this string cannot be encoded in the default charset is unspecified. The CharsetEncoder class should be used when more control over the encoding process is required.
Comments
Java 7+
It's possible to take advantage of the StandardCharsets JDK class:
String str=...
InputStream is = new ByteArrayInputStream(StandardCharsets.UTF_16.encode(str).array());
Comments
Beginning with Java 7, you can use the following idiom:
String someString = "...";
InputStream is = new ByteArrayInputStream( someString.getBytes(StandardCharsets.UTF_8) );
Comments
Instead of CharSet.forName, using com.google.common.base.Charsets from Google's Guava (http://code.google.com/p/guava-libraries/wiki/StringsExplained#Charsets) is is slightly nicer:
InputStream is = new ByteArrayInputStream( myString.getBytes(Charsets.UTF_8) );
Which CharSet you use depends entirely on what you're going to do with the InputStream, of course.
