修改Springboot 2的默认Json解析器JackSon为FastJson

@PostMapping("/users-anon/test")
public Test save(@RequestBody Test test) {
    testRepository.save(test);
    return test;
}

@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FastJsonHttpMessageConverter fastJsonConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig config = new FastJsonConfig();
        config.setCharset(Charset.forName("UTF-8"));
        config.setDateFormat("yyyyMMdd HH:mm:ssS");
        //设置允许返回为null的属性
        config.setSerializerFeatures(SerializerFeature.WriteMapNullValue);
        fastJsonConverter.setFastJsonConfig(config);
        List<MediaType> list = new ArrayList<>();
        list.add(MediaType.APPLICATION_JSON_UTF8);
        fastJsonConverter.setSupportedMediaTypes(list);
        converters.add(fastJsonConverter);
    }
}