java 生成二维码 幻幻Fate 2015年07月14日 0 3,495次浏览 java ,二维码

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 QRUtil {
	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;
	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;
	}
	/**
	 * 转换成图片文件
	 * @param matrix
	 * @param format
	 * @param file
	 * @throws IOException
	 */
	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);
		}
	}
	/**
	 * 转换成文件流
	 * @param matrix
	 * @param format
	 * @param stream
	 * @throws IOException
	 */
	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);
		}
	}
}

二维码的依赖包

com.google.zxingcore3.2.0

Controller：

@RequestMapping("/getQR")
public void getQR(String url,HttpServletResponse response){
	int width = 250;
	int height = 250;
	// 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(url,
				BarcodeFormat.QR_CODE, width, height, hints);
		QRUtil.writeToStream(bitMatrix, format, response.getOutputStream());
	} catch (WriterException | IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
}