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现象：

在SpringBoot项目中，接口返回的数据出现LocalDateTime对象被转换成了数组

原因分析：

默认序列化情况下会使用SerializationFeature.WRITE_DATES_AS_TIMESTAMPS。使用这个解析时就会打印出数组。

解决方法：

在配置类中加入一行配置，解决问题

package com.demo.configimport com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.List;@Configuration // 配置类
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {@Overridepublic void extendMessageConverters(List<HttpMessageConverter<?>> converters) {MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();ObjectMapper objectMapper = jackson2HttpMessageConverter.getObjectMapper();// 不显示为null的字段objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);SimpleModule simpleModule = new SimpleModule();simpleModule.addSerializer(Long.class, ToStringSerializer.instance);simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);objectMapper.registerModule(simpleModule);objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);jackson2HttpMessageConverter.setObjectMapper(objectMapper);// 放到第一个converters.add(0, jackson2HttpMessageConverter);}
}

解决后再查看：