1.添加 web 端扫码登录功能

src/main/java/vvpkassistant/Tools/QRCodeUtil.java

@@ -0,0 +1,31 @@
+package vvpkassistant.Tools;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.MultiFormatWriter;
+import com.google.zxing.WriterException;
+import com.google.zxing.client.j2se.MatrixToImageWriter;
+import com.google.zxing.common.BitMatrix;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+import java.util.Hashtable;
+
+public class QRCodeUtil {
+    
+    public static String generateQRCode(String content, int width, int height)
+        throws WriterException, IOException {
+        
+        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
+        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
+        
+        BitMatrix matrix = new MultiFormatWriter().encode(
+            content, BarcodeFormat.QR_CODE, width, height, hints);
+        
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        MatrixToImageWriter.writeToStream(matrix, "PNG", outputStream);
+
+        return Base64.getEncoder().encodeToString(outputStream.toByteArray());   
+    }
+}