【add】添加验证码前的干扰线

jero-boot/jero-boot-module-system/src/main/java/com/jero/modules/system/util/RandImageUtil.java

@@ -117,6 +117,10 @@ public class RandImageUtil {
             // 设置字符，字符间距，上边距
             graphics.drawString(String.valueOf(resultCode.charAt(i)), (23 * i) + 8, 26);
         }
+        for(int i = 0; i < 4; i++){
+            graphics.setColor(getRandColor(0, 256));
+            graphics.drawLine(0, random.nextInt(height), width, random.nextInt(height));
+        }
         // 图象生效
         graphics.dispose();
         return image;