图片二维码生成工具类（扫码直接跳转）

阳光穿透心脏的1/2处 2021-12-15 03:34 276阅读 0赞

1、首先需要导入jar包

<dependency>
       <groupId>com.google.zxing</groupId>
       <artifactId>core</artifactId>
       <version>2.2</version>
    </dependency>

2、工具类

package util;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.WriterException;
    import com.google.zxing.common.BitMatrix;
    
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.*;
    import java.util.Hashtable;
    
    public class QrCodeUtils {
    
    	public static byte[] creatRrCode(String contents, int width, int height) {
            String binary = null;
            Hashtable hints = new Hashtable();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            try {
                BitMatrix bitMatrix = new MultiFormatWriter().encode(
                        contents, BarcodeFormat.QR_CODE, width, height, hints);
                // 1、读取文件转换为字节数组
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                BufferedImage image = toBufferedImage(bitMatrix);
                //转换成png格式的IO流
                ImageIO.write(image, "png", out);
                byte[] bytes = out.toByteArray();
    
                // 2、将字节数组转为二进制
                return bytes;
            } catch (WriterException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }
    
        /**
         * image流数据处理
         *
         * @author ianly
         */
        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) ? 0xFF000000 : 0xFFFFFFFF);
                }
            }
            return image;
        }
    
    	public static void main(String[] args) {
    		
    		byte[] bytes = creatRrCode("http://www.baidu.com.cn", 200, 200);
    		FileOutputStream fos = null;
    		try {
    			 fos = new FileOutputStream(new File("d:/qrcode.png"));
    			fos.write(bytes);
    		} catch (FileNotFoundException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}finally{
    			if(fos!=null){
    				try {
    					fos.close();
    				} catch (IOException e) {
    					// TODO Auto-generated catch block
    					e.printStackTrace();
    				}
    			}
    		}
    		
    	}
    
    }

3、调用（页面直接使用<img>标签获取控制器生成的图片）

@RequestMapping("/makeQrCode")
        public void qfCode(HttpServletRequest request,HttpServletResponse response) throws IOException {
            byte[] bytes = QrCodeUtils.creatRrCode(“你想跳转的路径（可以配合前端传参数）”, 200, 200);
            ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
            BufferedImage bi1 = ImageIO.read(bais);
            // 禁止图像缓存。
            response.setHeader("Pragma", "no-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expires", 0);
            response.setContentType("image/jpeg");
            try {
                ImageIO.write(bi1, "jpg", response.getOutputStream());//不管输出什么格式图片，此处不需改动
            } catch (IOException e) {
                e.printStackTrace();
            }finally{
                if(bais!=null){
                    bais.close();
                }
            }
        }

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