序列化前，如图所示：

解决方式，序列化日期（localdatetime）格式

步骤一、添加序列化类

package com.abliner.test.common.configure;

import com.alibaba.fastjson.serializer.JSONSerializer;
import com.alibaba.fastjson.serializer.ObjectSerializer;
import com.alibaba.fastjson.serializer.SerializeWriter;

import java.io.IOException;
import java.lang.reflect.Type;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class LocalDateTimeSerializer implements ObjectSerializer {
    public static final LocalDateTimeSerializer instance = new LocalDateTimeSerializer();
    private static final String defaultPattern = "yyyy-MM-dd HH:mm:ss";

    public LocalDateTimeSerializer() {
    }

    @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)));
        }
    }

}

步骤二

package com.abliner.test.common.configure;

import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.serializer.ToStringSerializer;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("http://192.168.1.10:8081")
                // 是否发送Cookie
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "PUT", "DELETE");
    }

    @Bean//使用@Bean注入fastJsonHttpMessageConvert
    public HttpMessageConverter fastJsonHttpMessageConverters() {

        //定义一个Convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();

        fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteMapNullValue);
        SerializeConfig.globalInstance.put(Long.class, ToStringSerializer.instance);
        SerializeConfig serializeConfig = SerializeConfig.globalInstance;
        serializeConfig.put(LocalDateTime.class, LocalDateTimeSerializer.instance);
        fastJsonConfig.setSerializeConfig(serializeConfig);

        fastConverter.setFastJsonConfig(fastJsonConfig);
        /*但是MappingJackson2HttpMessageConverter里面支持的MediaTypes为application/json*/
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);

        HttpMessageConverter<?> converter = fastConverter;
        return converter;
    }


    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        /*排除掉Jackson*/
        for (int i = converters.size() - 1; i >= 0; i--) {
            if (converters.get(i) instanceof MappingJackson2HttpMessageConverter) {
                converters.remove(i);
            }
        }
        converters.add(fastJsonHttpMessageConverters());
    }

    /**
     * 处理静态资源无法访问
     *
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        // 解决静态资源无法访问
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        // 解决swagger无法访问
        registry.addResourceHandler("/swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
        // 解决swagger的js文件无法访问
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

}

主要是添加如图所示代码：

最后序列化完成示例图：