maven依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.1.0</version> /dependency>
servlet实列
package com.xx.plus; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.faceghost.web.base.utils.ValidateUtil; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.common.BitMatrix; @WebServlet("/genUrlQr") public class GenArticleQr extends HttpServlet{ private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String artId = request.getParameter("refid"); // String url = "https://baidu.com"; int width = 400; int height = 400; //声明图像内存 byte[] image = new byte[1024]; //初始化图像格式 response.reset(); response.setContentType("image/png"); //获取输出流 OutputStream fos = response.getOutputStream(); try { Map<EncodeHintType, String> hints = new HashMap<>(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints); BufferedImage Bimage = toBufferedImage(bitMatrix); if (!ImageIO.write(Bimage, "png", fos)) { throw new IOException("Could not write an image "); } fos.close(); } catch (Exception e) { e.printStackTrace(); } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } private static final int BLACK = 0xFF000000; private static final int WHITE = 0xFFFFFFFF; private 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; } }