Is there a way to load a (PlantUML-) generated image, without saving to the file system?

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I'm working with the Plant UML API to generate UML diagrams of tests in my Java project. The API generates an image and saves it to a PNG or SVG file in the file system.

I'm wondering if there's a way to just load the image directly in the console without saving it to the file system (or loading a file already in the file system).

For reference, I'm using the documentation PUML provided here and I'm calling something like:

import net.sourceforge.plantuml.SourceStringReader;
OutputStream png = ...;
String source = "@startuml\n";
source += "Bob -> Alice : hello\n";
source += "@enduml\n";

SourceStringReader reader = new SourceStringReader(source);
// Write the first image to "png"
String desc = reader.outputImage(png).getDescription();
// Return a null string if no generation
plantuml serialization image file java
1 Answers

I guess this should do the job.

public byte[] createUmlImage(String source){
    try {
        SourceStringReader reader = new SourceStringReader(source);
        final ByteArrayOutputStream os = new ByteArrayOutputStream();
        reader.outputImage(os);
        return os.toByteArray();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

I would also make another suggestion. Make use of StringBuilder's append() for string concatenation instead of the + operator.

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