add testcase for issue #685

src/test/java/com/alibaba/json/bvt/bug/Issue685.java

@@ -0,0 +1,26 @@
+package com.alibaba.json.bvt.bug;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.annotation.JSONField;
+import junit.framework.TestCase;
+
+import java.util.Date;
+
+/**
+ * Created by wenshao on 16/8/28.
+ */
+public class Issue685 extends TestCase {
+    public void test_for_issue() throws Exception {
+        Model model = new Model();
+        model.publishTime = new Date();
+        String text = JSON.toJSONString(model);
+
+        Model model2 = JSON.parseObject(text, Model.class);
+        assertEquals(model.publishTime, model2.publishTime);
+    }
+
+    public static class Model {
+        @JSONField(format= "yyyy-MM-dd'T'HH:mm:ss.SSS")
+        public Date publishTime;
+    }
+}