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Calling PlantUML from Java

You can easily integrate PlantUML with your own code by adding plantuml.jar in your classpath.

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PNG generation from a String

If your diagram description is stored in a String, you can use the SourceStringReader class to generate some PNG file.

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

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PNG generation from a File

If your diagram description is stored in a File, you can use the SourceFileReader class to generate some PNG file.

File source = ...;
SourceFileReader reader = new SourceFileReader(source);
List<GeneratedImage> list = reader.getGeneratedImages();
// Generated files
File png = list.get(0).getPngFile();

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SVG generation from a String

If your diagram description is stored in a String, you can use the SourceStringReader class to generate some SVG file.

String source = "@startuml\n";
source += "Bob -> Alice : hello\n";
source += "@enduml\n";

SourceStringReader reader = new SourceStringReader(source);
final ByteArrayOutputStream os = new ByteArrayOutputStream();
// Write the first image to "os"
String desc = reader.generateImage(os, new FileFormatOption(FileFormat.SVG));
os.close();

// The XML is stored into svg
final String svg = new String(os.toByteArray(), Charset.forName("UTF-8"));