diff --git a/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/util/HttpUtil.java b/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/util/HttpUtil.java
index e9e7759..4b62e4c 100644
--- a/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/util/HttpUtil.java
+++ b/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/util/HttpUtil.java
@@ -107,7 +107,12 @@ public class HttpUtil {
     public static SwMap post(String url, Map<String, String> paras) throws Exception {
         String json_resp = post(url, null, paras, null);
         if (StringUtils.isEmpty(json_resp) || !json_resp.startsWith("{")) return null;
-        return (SwMap) JsonUtil.parseMap(json_resp);
+        SwMap swMap = new SwMap();
+        Map map = JsonUtil.parseMap(json_resp);
+        if(map!=null){
+            swMap.putAll(map);
+        }
+        return swMap;
     }
 
     /**
@@ -147,7 +152,12 @@ public class HttpUtil {
             json_resp = new String(Base64.decodeBase64(json_resp), charset);
         }
         if (StringUtils.isEmpty(json_resp) || !json_resp.startsWith("{")) return null;
-        return (SwMap) JsonUtil.parseMap(json_resp);
+        SwMap swMap = new SwMap();
+        Map map = JsonUtil.parseMap(json_resp);
+        if(map!=null){
+            swMap.putAll(map);
+        }
+        return swMap;
     }
 
     /**
@@ -169,14 +179,24 @@ public class HttpUtil {
             json_resp = new String(Base64.decodeBase64(json_resp), charset);
         }
         if (StringUtils.isEmpty(json_resp) || !json_resp.startsWith("{")) return null;
-        return (SwMap) JsonUtil.parseMap(json_resp);
+        SwMap swMap = new SwMap();
+        Map map = JsonUtil.parseMap(json_resp);
+        if(map!=null){
+            swMap.putAll(map);
+        }
+        return swMap;
     }
 
 
     public static SwMap post(String url, Map<String, String> header, Map<String, String> paras) throws Exception {
         String json_resp = post(url, header, paras, null);
         if (StringUtils.isEmpty(json_resp) || !json_resp.startsWith("{")) return null;
-        return (SwMap) JsonUtil.parseMap(json_resp);
+        SwMap swMap = new SwMap();
+        Map map = JsonUtil.parseMap(json_resp);
+        if(map!=null){
+            swMap.putAll(map);
+        }
+        return swMap;
     }
 
     /**