生成山东农大二维码

悠悠 2024-03-16 14:28 8阅读 0赞

> 生成山东农大二维码

<%--
      Created by IntelliJ IDEA.
      User: CaptainDong
      Date: 2023/6/7
      Time: 15:26
      To change this template use File | Settings | File Templates.
    --%>
    
    <%@ page language="java" contentType="text/html; charset=UTF-8"
             pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>访问百度网址的二维码</title>
    </head>
    <body>
    <h1>请使用移动设备扫描以下二维码</h1>
    <img src="<%= request.getContextPath() %>/qrcode" />
    </body>
    </html>

package com.dong.erweima;
    
    import java.awt.image.BufferedImage;
    import java.io.IOException;
    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.google.zxing.BarcodeFormat;
    //import com.google.zxing.EncodeHintType;
    import com.google.zxing.WriterException;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.QRCodeWriter;
    
    @WebServlet("/qrcode")
    public class QRCodeServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            String url = "http://www.sdau.edu.cn/";
            int size = 250;
    
            try {
                // 设置二维码参数
                QRCodeWriter qrCodeWriter = new QRCodeWriter();
                BitMatrix bitMatrix = qrCodeWriter.encode(url, BarcodeFormat.QR_CODE, size, size);
    
                // 将二维码输出到response流中
                BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);
                response.setContentType("image/png");
                ImageIO.write(image, "png", response.getOutputStream());
            } catch (WriterException e) {
                // 发生错误时，返回404 Not Found错误页面
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
            }
        }
    }

运行结果：

![758794af881740e2a0136e55ea1036ff.png][]

[758794af881740e2a0136e55ea1036ff.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/8cda7d4378ac4e959391b26acbbd0ea8.png