Project works in eclipse but not after being packaged in a jar

问题

My project uses itext7 to create PDF files. When I launch from eclipse everything works perfectly. When I package it as a jar, everything works until I get to the point that I want to create a PDF. I then get:

Exception in thread "JavaFX Application Thread" com.itextpdf.io.IOException: I/O exception.
.....

Caused by: java.io.FileNotFoundException: C:\Users\puser\eclipse-workspace\Document\target\SE001-0.1.1-SNAPSHOT.jar\img\Safety.png (The system cannot find the path specified)

The project folder keeps the images at src/main/resources/img. Once the jar is created it simply has /img at root. This means you can't just specify a direct path because it changes when the jar is made. JavaFX Images work fine with..

Image user = new Image(getClass().getResourceAsStream("/img/Document.png"));

Using that with itext7 doesn't work because ImageDataFactory.create() is looking for byte[] and that is an input stream.

Now trying to use:

Image safetyImage = new Image(ImageDataFactory.create(System.getProperty("user.dir") + "/img/Safety.png"));

Does not work because the Jar is not inside the path.

What can I use to point to an image file inside the jar and use it with it ext7?

回答1:

mkl was correct and thank you!

I created a utility method to convert an input steam to a byte array.

   public static byte[] toByteArray(InputStream in) throws IOException {
          //InputStream is = new BufferedInputStream(System.in);
          ByteArrayOutputStream os = new ByteArrayOutputStream();
          byte [] buffer = new byte[1024];
          int len;
          // read bytes from the input stream and store them in buffer
            while ((len = in.read(buffer)) != -1) {
                // write bytes from the buffer into output stream
                os.write(buffer, 0, len);
            }
            return os.toByteArray();
       }

I then used that utility inside the ImageDataFactory.create() method.

Image safetyImage = new Image(ImageDataFactory.create(toByteArray(getClass().getResourceAsStream("/img/Safety.png"))));

来源：https://stackoverflow.com/questions/54191804/project-works-in-eclipse-but-not-after-being-packaged-in-a-jar

标签

java

maven

jar

itext7