完善DateFormat配置优先级

[Omega-Ariston]

fix issue #1868 #1968 #2029 #2452
正常的配置优先级应该是从小到大的，目前fastjson支持四种方式配置dateFormat，按照优先级从高到低分别为：

1. 通过JSON.toJSONStringWithDateFormat()函数传参
2. 通过在属性上添加@JSONField(format="yyyy-MM-dd")注解
3. 通过xml配置或FastJsonConfig.setDateFormat()函数传参
4. 通过修改JSON.DEFFAULT_DATE_FORMAT变量值

但是目前通过1和3方式配置的dateFormat存储到同一个变量里的，导致提升方式2的优先级时会同时覆盖1和3的优先级。所以用了不同的变量fastJsonConfigDateFormatPattern来存储方式3配置的dateFormat，并把与FastJsonConfig相关的setDateFormat方法统一到了这个变量上。

另外为了避免冲突， 场景3中使用FastJsonConfig设置的dateFormat的一些方法进行了调整，并已全部通过测试。

[codecov-io]

Codecov Report

Merging #2706 into master will decrease coverage by 0.05%.
The diff coverage is 76.47%.

@@             Coverage Diff              @@
##             master    #2706      +/-   ##
============================================
- Coverage     80.12%   80.07%   -0.06%     
- Complexity     7141     7143       +2     
============================================
  Files           145      145              
  Lines         26964    27000      +36     
  Branches       6449     6458       +9     
============================================
+ Hits          21605    21620      +15     
- Misses         3497     3508      +11     
- Partials       1862     1872      +10

Impacted Files	Coverage Δ	Complexity Δ
...ibaba/fastjson/support/jaxrs/FastJsonProvider.java	86.4% <100%> (ø)	41 <0> (ø)	⬇️
...ing/messaging/MappingFastJsonMessageConverter.java	78.57% <100%> (ø)	11 <0> (ø)	⬇️
...stjson/support/spring/FastJsonRedisSerializer.java	84.61% <100%> (ø)	8 <0> (ø)	⬇️
...n/support/spring/FastJsonHttpMessageConverter.java	70.54% <100%> (ø)	29 <0> (ø)	⬇️
...ava/com/alibaba/fastjson/serializer/DateCodec.java	87.28% <100%> (+0.22%)	41 <0> (+1)	⬆️
...baba/fastjson/support/spring/FastJsonJsonView.java	90.52% <100%> (ø)	33 <0> (ø)	⬇️
...on/support/retrofit/Retrofit2ConverterFactory.java	89.09% <100%> (ø)	18 <0> (ø)	⬇️
src/main/java/com/alibaba/fastjson/JSON.java	82.53% <60%> (-2.34%)	149 <4> (+1)
...om/alibaba/fastjson/serializer/JSONSerializer.java	84.79% <87.5%> (-0.38%)	77 <3> (+4)
...com/alibaba/fastjson/parser/JSONReaderScanner.java	72.61% <0%> (-1.28%)	44% <0%> (-1%)
... and 3 more

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[timandy]

应该是这个的优先级 2通过在属性上添加@JSONField(format="yyyy-MM-dd")注解 最高吧

[Omega-Ariston]

应该是这个的优先级 2通过在属性上添加@JSONField(format="yyyy-MM-dd")注解 最高吧

我的理解是影响粒度越小优先级越高，toJSONStringWithDateFormat()只会影响调用函数的这一次转换的结果，所以优先级最高

[timandy]

@Omega-Ariston toJsonString 时传入了 时间格式的情况呢?

toJsonString 传入时间格式时. 我想这个格式只应用到 没有加 @JsonFiled(format) 的字段.但是其他的字段我想用传入的..这种用例是否支持?

[timandy]

#696 #2832

[wenshao]

https://github.com/alibaba/fastjson/releases/tag/1.2.72
问题已修复，请用新版本