html :<img id="reCode" src="127.0.0.1/reCode"/>
也可以 <img id="reCode" > js: $("#reCode").attr("src","127.0.0.1/doctor/reCode");
以下是java 部分
pom.xml:
<dependency>
<groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>2.2</version> </dependency>
RecodeUtil : 自己建的工具类 ,只需要下面两个方法。
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 javax.servlet.http.HttpServletResponse; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Hashtable;
public static void creatRrCode(String contents, int width, int height,HttpServletResponse response) { 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", response.getOutputStream()); // byte[] bytes = out.toByteArray(); // // 2、将字节数组转为二进制 // BASE64Encoder encoder = new BASE64Encoder(); // binary = encoder.encodeBuffer(bytes).trim(); } catch (WriterException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }
/** * 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; }
controller层:
@RequestMapping("reCode") public void reCode(HttpServletResponse response){ QrCodeUtils.creatRrCode("https://blog.csdn.net/ianly123", 200,200,response); }
注意 :我是改的别人的方法,我习惯这样做,再网上找一个差不多的教程,然后改动,比如本来的方法是要返回一个string
我要的是直接返回想展示动态验证码一样 ,就直接写出到
HttpServletResponse
就可以了,要是些到本地,就把输出流改成你的文件流好了。
类似于下面,当然我并没有实践,因为懒 哈哈哈,不过直接输出页面 上面的可以满足。
Path file=new File("D:/img.png").toPath(); MatrixToImageWriter.writeToPath(bm, format, file);