improved for java.sql.Time support, for issue alibaba#2156

Author: wenshao

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

@@ -50,7 +50,8 @@ public void write(JSONSerializer serializer, Object object, Object fieldName, Ty
             return;
         }
 
-        if (object.getClass() == java.sql.Date.class) {
+        Class<?> clazz = object.getClass();
+        if (clazz == java.sql.Date.class) {
             long millis = ((java.sql.Date) object).getTime();
             TimeZone timeZone = serializer.timeZone;
             int offset = timeZone.getOffset(millis);
@@ -59,6 +60,14 @@ public void write(JSONSerializer serializer, Object object, Object fieldName, Ty
                 return;
             }
         }
+
+        if (clazz == java.sql.Time.class) {
+            long millis = ((java.sql.Time) object).getTime();
+            if (millis < 24L * 60L * 60L * 1000L) {
+                out.writeString(object.toString());
+                return;
+            }
+        }
 
         Date date;
         if (object instanceof Date) {
@@ -79,15 +88,15 @@ public void write(JSONSerializer serializer, Object object, Object fieldName, Ty
         }
 
         if (out.isEnabled(SerializerFeature.WriteClassName)) {
-            if (object.getClass() != fieldType) {
-                if (object.getClass() == java.util.Date.class) {
+            if (clazz != fieldType) {
+                if (clazz == java.util.Date.class) {
                     out.write("new Date(");
                     out.writeLong(((Date) object).getTime());
                     out.write(')');
                 } else {
                     out.write('{');
                     out.writeFieldName(JSON.DEFAULT_TYPE_KEY);
-                    serializer.write(object.getClass().getName());
+                    serializer.write(clazz.getName());
                     out.writeFieldValue(',', "val", ((Date) object).getTime());
                     out.write('}');
                 }

src/test/java/com/alibaba/json/bvt/issue_2100/Issue2156.java

@@ -9,4 +9,10 @@ public void test_for_issue() throws Exception {
         String str = JSON.toJSONStringWithDateFormat(date, JSON.DEFFAULT_DATE_FORMAT);
         assertEquals("\"2018-07-15\"", str);
     }
+
+    public void test_for_issue_time() throws Exception {
+        java.sql.Time date = java.sql.Time.valueOf("12:13:14");
+        String str = JSON.toJSONStringWithDateFormat(date, JSON.DEFFAULT_DATE_FORMAT);
+        assertEquals("\"12:13:14\"", str);
+    }
 }