PostNet

• Jun 19, 2026
• 2 minutes to read

PostNet is a USPS barcode that speeds mail sorting and routing. The symbology encodes data in bar heights - bars share a common width but vary in height.

Configure PostNet Settings

Use the PostNetOptions class to configure PostNet barcode settings.

The following code snippet creates a PostNet barcode and customizes its encoding parameters:

import com.devexpress.drawing.*;
import com.devexpress.docs.barcode.*;
import com.devexpress.system.drawing.*;
import com.devexpress.docs.Padding;

import java.io.*;
import java.nio.file.*;

public class Main {
    public static void main(String[] args) throws Exception {

        PostNetOptions options = new PostNetOptions();
        options.setPadding(new Padding(10));
        options.setShowText(true);
        options.setWidth(600);
        options.setHeight(200);

        Path outputDir = Path.of("output");
        Files.createDirectories(outputDir);

        try (FileOutputStream fileStream = new FileOutputStream(
                outputDir.resolve("postnet.png").toFile());
                BarcodeGenerator barcodeGenerator = new BarcodeGenerator(options)) {
                    barcodeGenerator.export(
                            "1234567890",
                            fileStream,
                            DXImageFormat.getPng());
        }
    }
}

Fluent API

Use the PostNetOptionsBuilder class to configure PostNet barcode settings with the Fluent API.

The following code snippet creates a PostNet barcode and customizes its encoding parameters with the Fluent API:

import com.devexpress.drawing.*;
import com.devexpress.docs.barcode.*;
import com.devexpress.system.drawing.*;
import com.devexpress.docs.Padding;

import java.io.*;
import java.nio.file.*;

public class Main {
    public static void main(String[] args) throws Exception {

        PostNetOptions options = PostNetOptionsBuilder.create()
            .withPadding(new Padding(10))
            .withShowText(true)
            .withWidth(600)
            .withHeight(200)
            .build();

        Path outputDir = Path.of("output");
        Files.createDirectories(outputDir);

        try (FileOutputStream fileStream = new FileOutputStream(
                outputDir.resolve("postnet.png").toFile());
                BarcodeGenerator barcodeGenerator = new BarcodeGenerator(options)) {
                    barcodeGenerator.export(
                            "1234567890",
                            fileStream,
                            DXImageFormat.getPng());
        }
    }
}