JAVA生成跳转指定页面并且附带参数的二维码

￡神魔★判官ぃ 2023-10-05 15:00 1阅读 0赞

所需jar包：

<dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>core</artifactId>
                <version>3.1.0</version>
            </dependency>
            <dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>javase</artifactId>
                <version>3.1.0</version>
            </dependency>

/**
     *
     * 实现说明：把服务器上的产品详情页的链接地址（含有ID）生成二维码，微信扫码，跳转到指定页
     * 需要jar:zxing-code-3.1.0.jar
     *
     */
    public class GenerateCode {
    
    	private static final int BLACK = 0xFF000000;
    	private static final int WHITE = 0xFFFFFFFF;
    
    	public static void main(String[] args) {
    		try {
    			boolean flag = generateCode("518");
    			if (flag) {
    				System.out.println("成功生成二维码");
    			}
    		} catch (WriterException | IOException e) {
    			System.err.println("生成二维码失败");
    			e.printStackTrace();
    		}
    	}
    
    	public static boolean generateCode(String productId) throws WriterException, IOException {
    		// 这里是URL，扫描之后就跳转到这个界面
    		String text = "https://www.baidu.com/?uudi=" + productId;
    
    		String path = "E:/"; // 图片生成的位置
    		int width = 400;
    		int height = 400;
    		// 二维码图片格式
    		String format = "jpg";
    		// 设置编码，防止中文乱码
    		Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object>();
    		ht.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    		// 设置二维码参数(编码内容，编码类型，图片宽度，图片高度,格式)
    		BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, ht);
    		// 生成二维码(定义二维码输出服务器路径)
    		File outputFile = new File(path);
    		if (!outputFile.exists()) {
    			// 创建文件夹
    			outputFile.mkdir();
    		}
    
    		int b_width = bitMatrix.getWidth();
    		int b_height = bitMatrix.getHeight();
    		// 建立图像缓冲器
    		BufferedImage image = new BufferedImage(b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
    		for (int x = 0; x < b_width; x++) {
    			for (int y = 0; y < b_height; y++) {
    				image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
    			}
    		}
    		// 生成二维码
    		ImageIO.write(image, format, new File(path + "/code." + format));
    		// 二维码的名称
    		// code.jpg
    
    		return true;
    	}
    }

通过接口下载：

@Controller
    public class GenerateCode {
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
    
        @GetMapping("/download/{code}")
        public void downloadCode(@PathVariable String code, HttpServletResponse response) throws WriterException, IOException {
            // 这里是URL，扫描之后就跳转到这个界面
            String text = "https://www.baidu.com/?intited=" + code;
    
            int width = 400;
            int height = 400;
            // 二维码图片格式
            String format = "jpg";
    
    
            // 设置编码，防止中文乱码
            Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object>();
            ht.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            // 设置二维码参数(编码内容，编码类型，图片宽度，图片高度,格式)
            BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, ht);
    
            int b_width = bitMatrix.getWidth();
            int b_height = bitMatrix.getHeight();
            // 建立图像缓冲器
            BufferedImage image = new BufferedImage(b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
            for (int x = 0; x < b_width; x++) {
                for (int y = 0; y < b_height; y++) {
                    image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
                }
            }
            String fileName= new StringBuffer().append(code).append(".").append(format).toString();
            response.setHeader("Content-Type","application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
    
            response.setContentType("application/octet-stream; charset=utf-8");
            // 生成二维码
            ServletOutputStream fileOutputStream = response.getOutputStream();
            ImageIO.write(image, format, fileOutputStream);
            fileOutputStream.flush();
            fileOutputStream.close();
        }
    
    
    }

或者这样也行

@Controller
    public class GenerateCode {
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
        @GetMapping("/download/{code}")
        public void downloadCode(@PathVariable String code, HttpServletRequest request, HttpServletResponse response) throws WriterException, IOException {
            // 这里是URL，扫描之后就跳转到这个界面
            String text = "https://www.baidu.com/?intited=" + code;
    
            int width = 400;
            int height = 400;
            // 二维码图片格式
            String format = "jpg";
    
    
            // 设置编码，防止中文乱码
            Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object>();
            ht.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            // 设置二维码参数(编码内容，编码类型，图片宽度，图片高度,格式)
            BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, ht);
    
            int b_width = bitMatrix.getWidth();
            int b_height = bitMatrix.getHeight();
            // 建立图像缓冲器
            BufferedImage image = new BufferedImage(b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
            for (int x = 0; x < b_width; x++) {
                for (int y = 0; y < b_height; y++) {
                    image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
                }
            }
            String fileName= new StringBuffer().append(code).append(".").append(format).toString();
            // 设置下载文件的mineType，告诉浏览器下载文件类型
            String mineType = request.getServletContext().getMimeType(fileName);
            System.out.println(mineType);
            response.setContentType(mineType);
            response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
    
    
            // 生成二维码
            ServletOutputStream fileOutputStream = response.getOutputStream();
            ImageIO.write(image, format, fileOutputStream);
            fileOutputStream.flush();
            fileOutputStream.close();
        }
    
    
    }

参考：[https://my.oschina.net/ydsakyclguozi/blog/887368][https_my.oschina.net_ydsakyclguozi_blog_887368]

[https_my.oschina.net_ydsakyclguozi_blog_887368]: https://my.oschina.net/ydsakyclguozi/blog/887368