Java QR code 二维码

 

You can refer to http://www.java2s.com/Code/Jar/z/Downloadzxingcore20jar.htm to download zxing-core-2.0.jar first.

then  create java file

MatrixToImageWriter.java

package com.syc.util.qrcode;

import com.google.zxing.common.BitMatrix;  
   
 import javax.imageio.ImageIO;  
 import java.io.File;  
 import java.io.OutputStream;  
 import java.io.IOException;  
 import java.awt.image.BufferedImage;  
   
   
 public final class MatrixToImageWriter {  
   
   private static final int BLACK = 0xFF000000;  
   private static final int WHITE = 0xFFFFFFFF;  
   
   private MatrixToImageWriter() {}  
   
     
   public static BufferedImage toBufferedImage(BitMatrix matrix) {  
     int width = matrix.getWidth();  
     int height = matrix.getHeight();  
     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
     for (int x = 0; x < width; x++) {  
       for (int y = 0; y < height; y++) {  
         image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);  
       }  
     }  
     return image;  
   }  
   
     
   public static void writeToFile(BitMatrix matrix, String format, File file)  
       throws IOException {  
     BufferedImage image = toBufferedImage(matrix);  
     if (!ImageIO.write(image, format, file)) {  
       throw new IOException("Could not write an image of format " + format + " to " + file);  
     }  
   }  
   
     
   public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)  
       throws IOException {  
     BufferedImage image = toBufferedImage(matrix);  
     if (!ImageIO.write(image, format, stream)) {  
       throw new IOException("Could not write an image of format " + format);  
     }  
   }  
   
 }  

 

and create test java

Test.java

package com.syc.util.qrcode;

import java.io.File;  
import java.util.Hashtable;  
  
import com.google.zxing.BarcodeFormat;  
import com.google.zxing.EncodeHintType;  
import com.google.zxing.MultiFormatWriter;  
import com.google.zxing.WriterException;  
import com.google.zxing.common.BitMatrix;  
  
public class Test {  
  
    /** 
     * @param args 
     * @throws Exception  
     */  
    public static void main(String[] args) throws Exception {  
        String text = "http://www.baidu.com";  
        int width = 300;  
        int height = 300;  
        //二维码的图片格式  
        String format = "gif";  
        Hashtable hints = new Hashtable();  
        //内容所使用编码  
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text,  
                BarcodeFormat.QR_CODE, width, height, hints);  
        //生成二维码  
        File outputFile = new File("d:"+File.separator+"new.gif");  
        MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);  
  
    }  
  
}  

 

then everything is ok, you can run Test.java to check the result.

Good luck for you~

 

--------------