Index: forgon-tools/src/main/java/com/forgon/tools/json/JSONUtil.java
===================================================================
diff -u -r14750 -r15364
--- forgon-tools/src/main/java/com/forgon/tools/json/JSONUtil.java	(.../JSONUtil.java)	(revision 14750)
+++ forgon-tools/src/main/java/com/forgon/tools/json/JSONUtil.java	(.../JSONUtil.java)	(revision 15364)
@@ -362,7 +362,7 @@
 	public static String optString(JSONObject obj, String key, String defValue) {
 		Object v = obj.opt(key);
 		if (v == null || JSONNull.getInstance().equals(v)) {
-			return null;
+			return defValue;
 		}
 		return obj.optString(key, defValue);
 	}