How to read a text file from JAR

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Created: firt (15 Apr 2007)
Last edited: lpvalente (09 Nov 2013)

This article demonstrates how to read a text file from a JAR.

If you want to read a text file from JAR file (read only), you have to:

  • Include the txt file in your project, so the IDE can append it to the JAR package.
  • Use the following code to read a text file from the JAR
private String readTextFile(String fileName) throws IOException {
InputStream input = getClass().getResourceAsStream(fileName);
ByteArrayOutputStream output = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[512];
int bytes;
while ((bytes = input.read (buffer)) > 0) {
output.write (buffer, 0, bytes);
input.close ();
return new String(output.toByteArray());
This page was last modified on 9 November 2013, at 22:57.
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