Java 生成二维码

• 我用的是Google的Zxing
  下载地址：http://code.google.com/p/zxing/downloads/list
• 如下，先写一个类作为代码
  

  package org.van;
  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;
  //构造方法
  private MatrixToImageWriter() {}
  //BufferedImapge
  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);
    }
    }
    }

• 然后写一个主函数来调用
  

  package org.van;
  
  import java.io.File;
  import java.util.Hashtable;
  
  import javax.swing.text.AbstractDocument.BranchElement;
  
  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 = "你们都是大屌丝";
  		int width = 300;
  		int height = 300;
  		// 二维码的图片格式
  		String format = "jpg";
  		Hashtable hints = new Hashtable();
  		// 内容z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.jpg");
  		System.out.println("File print complete");
  		MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
  	}
  } 
  

• 上传生成图片