Si deve scaricare la libreria XZing e si devono aggiungere al progetto le librerie core e javase contenute nelle sottodirectory del file zip
il codice e' stato modificato in modo da accettare in input sulla riga di comando (nella variabile args) il contenuto del QrCode. Questa motiva permette mediante una procedura batch di creare in automatico quanti QrCode si desiderino
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package qrcode;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.util.Hashtable;
import com.google.zxing.client.j2se.MatrixToImageWriter;
/**
*
* @author l.innocenti
*/
public class QrCode {
public static void main(String[] args) {
Charset charset = Charset.forName("UTF-8");
CharsetEncoder encoder = charset.newEncoder();
byte[] b = null;
try {
// Convert a string to UTF-8 bytes in a ByteBuffer
ByteBuffer bbuf = encoder.encode(CharBuffer.wrap(args[0]));
b = bbuf.array();
} catch (CharacterCodingException e) {
System.out.println(e.getMessage());
}
String data;
try {
data = new String(b, "UTF-8");
// get a byte matrix for the data
BitMatrix matrix = null;
int h = 100;
int w = 100;
com.google.zxing.Writer writer = new MultiFormatWriter();
try {
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(2);
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
matrix = writer.encode(data,
com.google.zxing.BarcodeFormat.QR_CODE, w, h, hints);
} catch (com.google.zxing.WriterException e) {
System.out.println(e.getMessage());
}
// change this path to match yours (this is my mac home folder, you can use: c:\\qr_png.png if you are on windows)
String filePath = args[0]+".png";
File file = new File(filePath);
try {
MatrixToImageWriter.writeToFile(matrix, "PNG", file);
System.out.println("printing to " + file.getAbsolutePath());
} catch (IOException e) {
System.out.println(e.getMessage());
}
} catch (UnsupportedEncodingException e) {
System.out.println(e.getMessage());
}
}
}
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Il risultato e' una immagine Png con nome uguale al contenuto del QrCode
Per creare in automatico 1000 numeri QrCode di numeri progressivi si puo' creare un file batch su Windows con la seguente linea
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FOR /L %%A IN (1,1,1000) DO java -jar Qrcode.jar %%A
mentre in Linux
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#!/bin/bash
for i in {1..1000}
do
java -jar Qrcode.jar $i
done
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FOR /L %%A IN (1,1,1000) DO java -jar Qrcode.jar %%A
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mentre in Linux
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#!/bin/bash
for i in {1..1000}
do
java -jar Qrcode.jar $i
done
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