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High quality QR Code generator library
/*
* QR Code generator demo (Java)
*
* Run this command-line program with no arguments. The program creates/overwrites a bunch of
* PNG and SVG files in the current working directory to demonstrate the creation of QR Codes.
*
* Copyright (c) Project Nayuki. (MIT License)
* https://www.nayuki.io/page/qr-code-generator-library
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
* - The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* - The Software is provided "as is", without warranty of any kind, express or
* implied, including but not limited to the warranties of merchantability,
* fitness for a particular purpose and noninfringement. In no event shall the
* authors or copyright holders be liable for any claim, damages or other
* liability, whether in an action of contract, tort or otherwise, arising from,
* out of or in connection with the Software or the use or other dealings in the
* Software.
*/
package io.nayuki.qrcodegen;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.Arrays;
import java.util.List;
import javax.imageio.ImageIO;
public final class QrCodeGeneratorDemo {
// The main application program.
public static void main(String[] args) throws IOException {
doBasicDemo();
doVarietyDemo();
doSegmentDemo();
doMaskDemo();
}
/*---- Demo suite ----*/
// Creates a single QR Code, then writes it to a PNG file and an SVG file.
private static void doBasicDemo() throws IOException {
String text = "Hello, world!"; // User-supplied Unicode text
QrCode.Ecc errCorLvl = QrCode.Ecc.LOW; // Error correction level
QrCode qr = QrCode.encodeText(text, errCorLvl); // Make the QR Code symbol
BufferedImage img = qr.toImage(10, 4); // Convert to bitmap image
File imgFile = new File("hello-world-QR.png"); // File path for output
ImageIO.write(img, "png", imgFile); // Write image to file
String svg = qr.toSvgString(4); // Convert to SVG XML code
File svgFile = new File("hello-world-QR.svg"); // File path for output
Files.write(svgFile.toPath(), // Write image to file
svg.getBytes(StandardCharsets.UTF_8));
}
// Creates a variety of QR Codes that exercise different features of the library, and writes each one to file.
private static void doVarietyDemo() throws IOException {
QrCode qr;
// Numeric mode encoding (3.33 bits per digit)
qr = QrCode.encodeText("314159265358979323846264338327950288419716939937510", QrCode.Ecc.MEDIUM);
writePng(qr.toImage(13, 1), "pi-digits-QR.png");
// Alphanumeric mode encoding (5.5 bits per character)
qr = QrCode.encodeText("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", QrCode.Ecc.HIGH);
writePng(qr.toImage(10, 2), "alphanumeric-QR.png");
// Unicode text as UTF-8
qr = QrCode.encodeText("こんにちwa、世界！ αβγδ", QrCode.Ecc.QUARTILE);
writePng(qr.toImage(10, 3), "unicode-QR.png");
// Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland)
qr = QrCode.encodeText(
"Alice was beginning to get very tired of sitting by her sister on the bank, "
+ "and of having nothing to do: once or twice she had peeped into the book her sister was reading, "
+ "but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice "
+ "'without pictures or conversations?' So she was considering in her own mind (as well as she could, "
+ "for the hot day made her feel very sleepy and stupid), whether the pleasure of making a "
+ "daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly "
+ "a White Rabbit with pink eyes ran close by her.", QrCode.Ecc.HIGH);
writePng(qr.toImage(6, 10), "alice-wonderland-QR.png");
}
// Creates QR Codes with manually specified segments for better compactness.
private static void doSegmentDemo() throws IOException {
QrCode qr;
List segs;
// Illustration "silver"
String silver0 = "THE SQUARE ROOT OF 2 IS 1.";
String silver1 = "41421356237309504880168872420969807856967187537694807317667973799";
qr = QrCode.encodeText(silver0 + silver1, QrCode.Ecc.LOW);
writePng(qr.toImage(10, 3), "sqrt2-monolithic-QR.png");
segs = Arrays.asList(
QrSegment.makeAlphanumeric(silver0),
QrSegment.makeNumeric(silver1));
qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW);
writePng(qr.toImage(10, 3), "sqrt2-segmented-QR.png");
// Illustration "golden"
String golden0 = "Golden ratio φ = 1.";
String golden1 = "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374";
String golden2 = "......";
qr = QrCode.encodeText(golden0 + golden1 + golden2, QrCode.Ecc.LOW);
writePng(qr.toImage(8, 5), "phi-monolithic-QR.png");
segs = Arrays.asList(
QrSegment.makeBytes(golden0.getBytes(StandardCharsets.UTF_8)),
QrSegment.makeNumeric(golden1),
QrSegment.makeAlphanumeric(golden2));
qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW);
writePng(qr.toImage(8, 5), "phi-segmented-QR.png");
// Illustration "Madoka": kanji, kana, Cyrillic, full-width Latin, Greek characters
String madoka = "「魔法少女まどか☆マギカ」って、 ИАИ ｄｅｓｕ κα？";
qr = QrCode.encodeText(madoka, QrCode.Ecc.LOW);
writePng(qr.toImage(9, 4), "madoka-utf8-QR.png");
segs = Arrays.asList(QrSegmentAdvanced.makeKanji(madoka));
qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW);
writePng(qr.toImage(9, 4), "madoka-kanji-QR.png");
}
// Creates QR Codes with the same size and contents but different mask patterns.
private static void doMaskDemo() throws IOException {
QrCode qr;
List segs;
// Project Nayuki URL
segs = QrSegment.makeSegments("https://www.nayuki.io/");
qr = QrCode.encodeSegments(segs, QrCode.Ecc.HIGH, QrCode.MIN_VERSION, QrCode.MAX_VERSION, -1, true); // Automatic mask
writePng(qr.toImage(8, 6), "project-nayuki-automask-QR.png");
qr = QrCode.encodeSegments(segs, QrCode.Ecc.HIGH, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 3, true); // Force mask 3
writePng(qr.toImage(8, 6), "project-nayuki-mask3-QR.png");
// Chinese text as UTF-8
segs = QrSegment.makeSegments("維基百科（Wikipedia，聆聽i/ˌwɪkᵻˈpiːdi.ə/）是一個自由內容、公開編輯且多語言的網路百科全書協作計畫");
qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 0, true); // Force mask 0
writePng(qr.toImage(10, 3), "unicode-mask0-QR.png");
qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 1, true); // Force mask 1
writePng(qr.toImage(10, 3), "unicode-mask1-QR.png");
qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 5, true); // Force mask 5
writePng(qr.toImage(10, 3), "unicode-mask5-QR.png");
qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 7, true); // Force mask 7
writePng(qr.toImage(10, 3), "unicode-mask7-QR.png");
}
/*---- Utilities ----*/
// Helper function to reduce code duplication.
private static void writePng(BufferedImage img, String filepath) throws IOException {
ImageIO.write(img, "png", new File(filepath));
}
}