LocalDateTime 为什么会有 T 间隔呢？

见源码

    @Override
    public String toString() {
        return date.toString() + 'T' + time.toString();
    }

第一种方式，全局处理

import java.time.ZoneId;
import java.util.Locale;
import java.util.TimeZone;

import com.fasterxml.jackson.annotation.JsonInclude;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.fasterxml.jackson.databind.ObjectMapper;
/**
 * @author si
 */
@Configuration
@ConditionalOnClass(ObjectMapper.class)
@AutoConfigureBefore(JacksonAutoConfiguration.class)
public class JacksonConfig
{
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer customizer()
    {
        return builder -> {
            builder.locale(Locale.CHINA);
            builder.timeZone(TimeZone.getTimeZone(ZoneId.systemDefault()));
            //转换时间格式
            builder.simpleDateFormat("yyyy-MM-dd HH:mm:ss");
            //转换定义的工具类
            builder.modules(new JacksonLocalDateTimeModule());
            //为null的数据不返回给前端
            builder.serializationInclusion(JsonInclude.Include.NON_NULL);
        };
    }
}

需要转换类型的工具类

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.datatype.jsr310.PackageVersion;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
/**
 * @author si
 */
public class JacksonLocalDateTimeModule extends SimpleModule
{
    private static final long serialVersionUID = 595505687562973734L;
    
    public JacksonLocalDateTimeModule()
    {
        super(PackageVersion.VERSION);
        this.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        this.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        this.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        this.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        this.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        this.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
    }
}

pom
jackson
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

第二种方式：注解

 @DateTimeFormat(pattern = "yyyy-MM-dd")
 @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
//放到返回的VO类的属性上即可