diff --git a/src/org/redkale/net/http/RestHttpServlet.java b/src/org/redkale/net/http/RestHttpServlet.java
index 102ded556..446e98c64 100644
--- a/src/org/redkale/net/http/RestHttpServlet.java
+++ b/src/org/redkale/net/http/RestHttpServlet.java
@@ -5,7 +5,7 @@
  */
 package org.redkale.net.http;
 
-import java.io.IOException;
+import java.io.*;
 import org.redkale.util.Attribute;
 
 /**
@@ -20,11 +20,18 @@ public abstract class RestHttpServlet<T> extends HttpBaseServlet {
     protected abstract T currentUser(HttpRequest req) throws IOException;
 
     protected void finishJson(final HttpResponse response, RestOutput output) throws IOException {
-        if (output != null) {
-            response.addHeader(output.getHeaders());
-            response.addCookie(output.getCookies());
+        if (output == null) {
+            response.finishJson(output);
+            return;
+        }
+        response.addHeader(output.getHeaders());
+        response.addCookie(output.getCookies());
+
+        if (output.getResult() instanceof File) {
+            response.finish((File) output.getResult());
+        } else {
+            response.finishJson(output.getResult());
         }
-        response.finishJson(output == null ? null : output.getResult());
     }
 
     protected void finishJsResult(final HttpResponse response, final String var, RestOutput output) throws IOException {