diff --git a/src/main/java/io/jboot/support/swagger/JbootSwaggerController.java b/src/main/java/io/jboot/support/swagger/JbootSwaggerController.java
index a491f51e93e43934b0f1ce29ca3253ecf5337e00..2f9023b1619ed6725b4525b941c8698f3e819aa0 100644
--- a/src/main/java/io/jboot/support/swagger/JbootSwaggerController.java
+++ b/src/main/java/io/jboot/support/swagger/JbootSwaggerController.java
@@ -45,7 +45,7 @@ public class JbootSwaggerController extends JbootController {
         }
 
         String basePath = getRequest().getRequestURL().toString();
-        String jsonUrl = basePath + "json";
+        String jsonUrl = basePath.endsWith("/") ? basePath + "json" : basePath + "/json";
 
         html = html.replace("http://petstore.swagger.io/v2/swagger.json", jsonUrl);
         // 可能是 https ，看下载的 swagger 版本