这个问题可以修改或覆盖FastJsonHttpMessageConverter的writeInternal方法解决，另外JSONField注解应该放在getter或setter上分别表示序列化和反序列化时候的格式，放在属性上fastjson现在版本已经不再支持。修改writeInternal代码如下（分支master，无法提交，希望有老铁能联系阿里巴巴解决这个问题）：

@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {

    ByteArrayOutputStream outnew = new ByteArrayOutputStream();
    try {
        HttpHeaders headers = outputMessage.getHeaders();

        //获取全局配置的filter
        SerializeFilter[] globalFilters = fastJsonConfig.getSerializeFilters();
        List<SerializeFilter> allFilters = new ArrayList<SerializeFilter>(Arrays.asList(globalFilters));

        boolean isJsonp = false;

        //不知道为什么会有这行代码， 但是为了保持和原来的行为一致，还是保留下来
        Object value = strangeCodeForJackson(object);

        if (value instanceof FastJsonContainer) {
            FastJsonContainer fastJsonContainer = (FastJsonContainer) value;
            PropertyPreFilters filters = fastJsonContainer.getFilters();
            allFilters.addAll(filters.getFilters());
            value = fastJsonContainer.getValue();
        }

        //jsonp，保留对原本直接返回MappingFastJsonValue方法的支持
        //更好的方式是直接返回com.alibaba.fastjson.JSONPObject
        if (value instanceof MappingFastJsonValue) {
            isJsonp = true;
            value = ((MappingFastJsonValue) value).getValue();
        } else if (value instanceof JSONPObject) {
            if(!(((JSONPObject) value).getFunction() == null) && !("".equals(((JSONPObject) value).getFunction()))){
                isJsonp = true;
            }
          
        }


        int len = writePrefix(outnew, object);
        
        
        /* these codes are  repair by Frank Fan
         
         len += JSON.writeJSONString(outnew, //
                fastJsonConfig.getCharset(), //
                value, //
                fastJsonConfig.getSerializeConfig(), //
                //fastJsonConfig.getSerializeFilters(), //
                allFilters.toArray(new SerializeFilter[allFilters.size()]),
                fastJsonConfig.getDateFormat(), //
                JSON.DEFAULT_GENERATE_FEATURE, //
                fastJsonConfig.getSerializerFeatures());
                
         */
        
        
        
        /**
         * solve the problem that @JSONField(format = "yyyy-MM-dd") doesn't take effect 
         * after set global date format by the code " fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");"
         * 
         */
        //Frank Fan code start 
        if(JSON.DEFFAULT_DATE_FORMAT != fastJsonConfig.getDateFormat()){
        	JSON.DEFFAULT_DATE_FORMAT = fastJsonConfig.getDateFormat();
        }
        
        String json = JSON.toJSONString(object, //
        		fastJsonConfig.getSerializeConfig(), /*若是继承覆盖把这里的fastJsonConfig换成getFastJsonConfig()即可*/
        		fastJsonConfig.getSerializeFilters(), //
                null, //
                JSON.DEFAULT_GENERATE_FEATURE, //
                fastJsonConfig.getSerializerFeatures());
        byte[] bytes = json.getBytes(getFastJsonConfig().getCharset());
        outnew.write(bytes);
        len += bytes.length;
        headers.setContentLength(len);
        OutputStream out = outputMessage.getBody();
        outnew.writeTo(out);
        outnew.close();
        //Frank Fan code start
        
        
        len += writeSuffix(outnew, object);

        if (isJsonp) {
            headers.setContentType(APPLICATION_JAVASCRIPT);
        }
        if (fastJsonConfig.isWriteContentLength()) {
            headers.setContentLength(len);
        }

        outnew.writeTo(outputMessage.getBody());

    } catch (JSONException ex) {
        throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getMessage(), ex);
    } finally {
        outnew.close();
    }
}

@JSONField(format = "yyyy-MM-dd") 无效 #1510

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