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遇到的问题：添加FastJson 配置后不起效果springboot 任然使用原来的JSON 解析器

第一步：需要添加FastJson 依赖

        <!-- 阿里JSON解析器 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>

第二步：添加添加处理器，此步骤要注意，集成WebMvcConfigurationSupport自定义类只能在一个地方出现，不能重复出现。

@Configuration
public class CustomizeWebMvcConfigurationSupport extends WebMvcConfigurationSupport {
   

    /**
     * JSON-处理器
     * @return
     */
    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters){
        Iterator<HttpMessageConverter<?>> iterator = converters.iterator();
        while(iterator.hasNext()){
            HttpMessageConverter<?> converter = iterator.next();
            if(converter instanceof MappingJackson2HttpMessageConverter){
                iterator.remove();
            }
        }
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig config = new FastJsonConfig();
        SerializeConfig serializeConfig = SerializeConfig.globalInstance;
        serializeConfig.put(LocalDateTime.class, LocalDateTimeToTimestampSerializer.instance);
        config.setSerializeConfig(serializeConfig);
        config.setSerializerFeatures(SerializerFeature.PrettyFormat);
        fastJsonHttpMessageConverter.setFastJsonConfig(config);
        converters.add(fastJsonHttpMessageConverter);
    }
}

第三步：添加日期解析器

@Component
public class LocalDateTimeToTimestampSerializer implements ObjectSerializer {

    public static final LocalDateTimeToTimestampSerializer instance = new LocalDateTimeToTimestampSerializer();
    private static final String defaultPattern = "yyyy-MM-dd HH:mm:ss";

    public LocalDateTimeToTimestampSerializer() {
    }

    @Override
    public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
        SerializeWriter out = serializer.out;
        if (object == null) {
            out.writeNull();
        } else {
            LocalDateTime result = (LocalDateTime) object;
            out.writeString(result.format(DateTimeFormatter.ofPattern(defaultPattern)));
        }
    }

}

完成以上3步就能实现JSON 日期的正常的装换