backport bug fixed #1371

src/main/java/com/alibaba/fastjson/serializer/MapSerializer.java

@@ -117,8 +117,9 @@ public void write(JSONSerializer serializer, Object object, Object fieldName, Ty
                         out.write(',');
                     }
 
-                    if ((out.features & SerializerFeature.BrowserCompatible.mask) != 0
-                        || (out.features & SerializerFeature.WriteNonStringKeyAsString.mask) != 0) {
+                    if (((out.features & SerializerFeature.BrowserCompatible.mask) != 0
+                        || (out.features & SerializerFeature.WriteNonStringKeyAsString.mask) != 0
+                            ) && !(entryKey instanceof Enum)) {
                         String strEntryKey = JSON.toJSONString(entryKey);
                         serializer.write(strEntryKey);
                     } else {

src/test/java/com/alibaba/json/bvt/issue_1300/Issue1371.java

@@ -0,0 +1,63 @@
+package com.alibaba.json.bvt.issue_1300;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.serializer.SerializerFeature;
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+import java.util.Map;
+import java.util.TreeMap;
+
+/**
+ * Created by wenshao on 05/08/2017.
+ */
+public class Issue1371 extends TestCase {
+    private enum Rooms{
+        A, B, C, D ,E ;
+    }
+
+    public void testFastjsonEnum(){
+
+        Map<Rooms, Rooms> enumMap = new TreeMap<Rooms, Rooms>();
+
+        enumMap.put(Rooms.C, Rooms.D);
+        enumMap.put(Rooms.E, Rooms.A);
+
+        Assert.assertEquals(JSON.toJSONString(enumMap, SerializerFeature.WriteNonStringKeyAsString),
+                "{\"C\":\"D\",\"E\":\"A\"}");
+
+    }
+
+
+
+
+//    public void testParsed(){
+//
+//        String oldStyleJson = "{1:'abc', 2:'cde'}";
+//
+//        Gson gson = new Gson();
+//
+//        Map fromJson = gson.fromJson(oldStyleJson, Map.class);
+//
+//        Assert.assertNull(fromJson.get(1));
+//
+//        Assert.assertEquals(fromJson.get("1"), "abc" );
+//
+//        Map parsed = JSON.parseObject(oldStyleJson, Map.class, Feature.IgnoreAutoType, Feature.DisableFieldSmartMatch);
+//
+//
+//        Assert.assertNull(parsed.get(1));
+//
+//        Assert.assertEquals(parsed.get("1"), "abc" );
+//
+//    }
+//
+//    public void testParsed_jackson() throws Exception {
+//
+//        String oldStyleJson = "{1:\"abc\", 2:\"cde\"}";
+//
+//        ObjectMapper objectMapper = new ObjectMapper();
+//        Map fromJson = objectMapper.readValue(oldStyleJson, Map.class);
+//        Assert.assertNull(fromJson.get(1));
+//    }
+}