148 lines
6.2 KiB
Java
148 lines
6.2 KiB
Java
/*
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* QR Code generator demo (Java)
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*
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* Run this command-line program with no arguments. The program creates/overwrites a bunch of
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* PNG and SVG files in the current working directory to demonstrate the creation of QR Codes.
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*
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* Copyright (c) 2016 Project Nayuki
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* https://www.nayuki.io/page/qr-code-generator-library
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*
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* (MIT License)
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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* - The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* - The Software is provided "as is", without warranty of any kind, express or
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* implied, including but not limited to the warranties of merchantability,
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* fitness for a particular purpose and noninfringement. In no event shall the
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* authors or copyright holders be liable for any claim, damages or other
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* liability, whether in an action of contract, tort or otherwise, arising from,
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* out of or in connection with the Software or the use or other dealings in the
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* Software.
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*/
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package io.nayuki.qrcodegen;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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import java.nio.charset.StandardCharsets;
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import java.util.Arrays;
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import java.util.List;
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import javax.imageio.ImageIO;
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public final class QrCodeGeneratorDemo {
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// The main application program.
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public static void main(String[] args) throws IOException {
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doBasicDemo();
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doVarietyDemo();
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doSegmentDemo();
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}
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// Creates a single QR Code, then writes it to a PNG file and an SVG file.
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private static void doBasicDemo() throws IOException {
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String text = "Hello, world!"; // User-supplied Unicode text
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QrCode.Ecc errCorLvl = QrCode.Ecc.LOW; // Error correction level
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QrCode qr = QrCode.encodeText(text, errCorLvl); // Make the QR Code symbol
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BufferedImage img = qr.toImage(10, 4); // Convert to bitmap image
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File imgFile = new File("hello-world-QR.png"); // File path for output
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ImageIO.write(img, "png", imgFile); // Write image to file
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String svg = qr.toSvgString(4); // Convert to SVG XML code
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try (Writer out = new OutputStreamWriter(
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new FileOutputStream("hello-world-QR.svg"),
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StandardCharsets.UTF_8)) {
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out.write(svg); // Create/overwrite file and write SVG data
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}
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}
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// Creates a variety of QR Codes that exercise different features of the library, and writes each one to file.
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private static void doVarietyDemo() throws IOException {
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QrCode qr;
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// Project Nayuki URL
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qr = QrCode.encodeText("https://www.nayuki.io/", QrCode.Ecc.HIGH);
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qr = new QrCode(qr, 3); // Change mask, forcing to mask #3
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writePng(qr.toImage(8, 6), "project-nayuki-QR.png");
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// Numeric mode encoding (3.33 bits per digit)
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qr = QrCode.encodeText("314159265358979323846264338327950288419716939937510", QrCode.Ecc.MEDIUM);
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writePng(qr.toImage(13, 1), "pi-digits-QR.png");
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// Alphanumeric mode encoding (5.5 bits per character)
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qr = QrCode.encodeText("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", QrCode.Ecc.HIGH);
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writePng(qr.toImage(10, 2), "alphanumeric-QR.png");
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// Unicode text as UTF-8, and different masks
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qr = QrCode.encodeText("こんにちwa、世界！ αβγδ", QrCode.Ecc.QUARTILE);
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writePng(new QrCode(qr, 0).toImage(10, 3), "unicode-mask0-QR.png");
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writePng(new QrCode(qr, 1).toImage(10, 3), "unicode-mask1-QR.png");
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writePng(new QrCode(qr, 5).toImage(10, 3), "unicode-mask5-QR.png");
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writePng(new QrCode(qr, 7).toImage(10, 3), "unicode-mask7-QR.png");
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// Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland)
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qr = QrCode.encodeText("Alice was beginning to get very tired of sitting by her sister on the bank, "
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+ "and of having nothing to do: once or twice she had peeped into the book her sister was reading, "
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+ "but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice "
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+ "'without pictures or conversations?' So she was considering in her own mind (as well as she could, "
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+ "for the hot day made her feel very sleepy and stupid), whether the pleasure of making a "
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+ "daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly "
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+ "a White Rabbit with pink eyes ran close by her.",
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QrCode.Ecc.HIGH);
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writePng(qr.toImage(6, 10), "alice-wonderland-QR.png");
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}
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// Creates QR Codes with manually specified segments for better compactness.
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private static void doSegmentDemo() throws IOException {
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QrCode qr;
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List<QrSegment> segs;
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// Illustration "silver"
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String silver0 = "THE SQUARE ROOT OF 2 IS 1.";
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String silver1 = "41421356237309504880168872420969807856967187537694807317667973799";
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qr = QrCode.encodeText(silver0 + silver1, QrCode.Ecc.LOW);
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writePng(qr.toImage(10, 3), "sqrt2-monolithic-QR.png");
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segs = Arrays.asList(
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QrSegment.makeAlphanumeric(silver0),
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QrSegment.makeNumeric(silver1));
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qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW);
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writePng(qr.toImage(10, 3), "sqrt2-segmented-QR.png");
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// Illustration "golden"
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String golden0 = "Golden ratio φ = 1.";
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String golden1 = "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374";
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String golden2 = "......";
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qr = QrCode.encodeText(golden0 + golden1 + golden2, QrCode.Ecc.LOW);
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writePng(qr.toImage(8, 5), "phi-monolithic-QR.png");
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segs = Arrays.asList(
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QrSegment.makeBytes(golden0.getBytes(StandardCharsets.UTF_8)),
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QrSegment.makeNumeric(golden1),
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QrSegment.makeAlphanumeric(golden2));
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qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW);
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writePng(qr.toImage(8, 5), "phi-segmented-QR.png");
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}
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// Helper function to reduce code duplication.
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private static void writePng(BufferedImage img, String filepath) throws IOException {
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ImageIO.write(img, "png", new File(filepath));
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}
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}
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