網上絕大多數的解決方案都是沒有用的!不要浪費時間!!!
使用場景
一)、DTO含有LocalDateTime字段時,可以將日期格式化,傳輸出去
二)、當後端實體對象的LocalDateTime字段需要接收前端傳來的日期字符串,如2019-12-01,可以反序列化給日期字段
LocalDateTime 反序列化器
不需要另外引入什麼jsr310依賴,spring-boot-starter-web裏面就包含有
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>2.9.10</version>
<scope>compile</scope>
</dependency>
<!-- 反序列化LocalDateTime需要用到 -->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-core</artifactId>
<version>4.5.2</version>
</dependency>
import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUtil;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
/**
* LocalDateTime 反序列化器
* <p>
* 說明:
* 1. 借用hutool相關工具類
*
* @author MoCha
* @date 2019/11/30
*/
public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
@Override
public LocalDateTime deserialize(JsonParser parser, DeserializationContext context) throws IOException {
String dateStr = parser.getText();
DateTime dateTime;
try {
dateTime = DateUtil.parse(dateStr);
} catch (Exception e) {
dateTime = DateUtil.parseDateTime(dateStr.replaceAll("T", " "));
}
Date date = dateTime.toJdkDate();
Instant instant = date.toInstant();
ZoneId zoneId = ZoneId.systemDefault();
return instant.atZone(zoneId).toLocalDateTime();
}
@Override
public Class<?> handledType() {
// 關鍵
return LocalDateTime.class;
}
}
LocalDateTime 日期適配器
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
/**
* LocalDateTime 日期適配器
*
* @author MoCha
* @date 2019/11/30
*/
@Configuration
public class LocalDateTimeConvertConfig {
@Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
private String pattern;
/**
* 配置LocalDateTime 序列化器與反序列化器
* <p>
* 說明:
* 1. 下面配置的new LocalDateTimeDeserializer()爲我們定製的LocalDateTime反序列化器
*/
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
return builder -> {
builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer());
};
}
/**
* LocalDateTime 序列化器
*/
@Bean
public LocalDateTimeSerializer localDateTimeSerializer() {
return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern));
}
}