zxing生成二维码

JAVA生成二维码

1.首先是把zxing-2.0.jar zxing-core-2.0.jar两个包加入到工程中

2.提供工具类参考MatrixToImageWriter

package com.demo;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.BitMatrix;

public 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);
  }
 }

}

 

 

3.生成二维码代码

public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  response.setHeader("Pragma", "No-cache");
  response.setHeader("Cache-Control", "no-cache");
  response.setDateHeader("Expires", 0);
  
  response.setContentType("image/jpeg");
  
  String text = "http://www.baidu.com";
  int width = 200;
  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;
  try {
      bitMatrix = new MultiFormatWriter().encode(text,
     BarcodeFormat.QR_CODE, width, height, hints);
     // 生成二维码
     //写入文件
    // File outputFile = new File("d:" + File.separator + "new.gif");
    //MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
      MatrixToImageWriter.writeToStream(bitMatrix, format, response.getOutputStream() );//写入到浏览器
   
  } catch (Exception e) {
   e.printStackTrace();
  }
  
  
 }