[Java]Jackson全局配置日期类型对象序列化格式

Jackson全局配置日期类型对象序列化格式，支持Date序列化，LocalDateTime、LocalDate的序列化和反序列化格式。配置后无需再使用@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")注解。

配置类代码如下：

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;

import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.TimeZone;

/**
 * <h2>Jackson配置</h2>
 *
 * @author GuoWeiLiang
 * @since 2025/9/1 17:27
 */
@Configuration
@AutoConfigureBefore(JacksonAutoConfiguration.class)
public class JacksonConfig {
    private final DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    private final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * 自定义Jackson的ObjectMapper。
     * 支持Date、LocalDate及LocalDateTime格式化
     */
    @Bean
    ObjectMapper objectMapper() {
        return new ObjectMapper()
            .setLocale(Locale.CHINA)
            .setTimeZone(TimeZone.getTimeZone(ZoneId.systemDefault()))
            .registerModule(javaTimeModule())
            .setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")) // Date类型
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
            .findAndRegisterModules();
    }

    private Module javaTimeModule() {
        JavaTimeModule module = new JavaTimeModule();
        // 序列化
        module.addSerializer(new LocalDateTimeSerializer(dateTimeFormatter));
        module.addSerializer(new LocalDateSerializer(dateFormatter));

        // 反序列化
        module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(dateTimeFormatter));
        module.addDeserializer(LocalDate.class, new LocalDateDeserializer(dateFormatter));
        return module;
    }
}