java生成自己的微信二维码

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根据上一篇得到的数据，我们可以生成自己的微信二维码：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

public class QREncode {
	
   private static final int BLACK = 0xFF000000; 
   private static final int WHITE = 0xFFFFFFFF; 
    
   private QREncode() {} 
    
      
   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); 
     } 
   }
   @SuppressWarnings({ "unchecked", "rawtypes" })
public static void main(String[] args) throws Exception { 
       String text = "http://weixin.qq.com/r/h685IaDEkf3ureRC9-qV";
       int width = 300; 
       int height = 300; 
       String format = "png"; 
       Hashtable hints = new Hashtable(); 
       hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
       BitMatrix bitMatrix = new MultiFormatWriter().encode(text, 
               BarcodeFormat.QR_CODE, width, height, hints); 
       File outputFile = new File("d:"+File.separator+"qr.png"); 
       QREncode.writeToFile(bitMatrix, format, outputFile); 
   } 
}

jar包及目录文档：

运行结果：

jar包及源码：QREncode

下一篇将介绍生成带图片的二维码。